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[[Image:Brain.png|frame|Rendering of human brain based on MRI data]]
 
[[Image:Brain.png|frame|Rendering of human brain based on MRI data]]
   
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:''For the journal of the same name, see [[Cognitive Science (journal)]]''
'''Cognitive science''' is usually defined as the scientific study either of [[mind]] or of [[intelligence (trait)|intelligence]] (e.g. Luger 1994). Practically every introduction to cognitive science also stresses that it is highly [[interdisciplinary]]; the primary components of cognitive science include [[psychology]], [[neuroscience]], [[linguistics]], [[philosophy]], and [[computer science]], while other components include [[robotics]], [[anthropology]] and [[biology]].
 
   
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'''Cognitive science''' is usually defined as the scientific study either of [[mind]] or of [[intelligence (trait)|intelligence]] (e.g. Luger 1994). Practically every introduction to cognitive science also stresses that it is highly [[interdisciplinary]]; the primary components of cognitive science include [[cognitive psychology]], [[cognitive neuroscience]], [[linguistics]], [[philosophy]], and [[computer science]], while other components include [[robotics]], [[anthropology]] and [[biology]].
==History==
 
The term ''Cognitive Science'' was coined by [[Christopher Longuet-Higgins]] in his 1973 commentary on the [[Lighthill report]], which was on the state of [[Artificial Intelligence]] research.
 
   
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It relies on varying scientific methodology (e.g. behavioral experimentation, [[computational simulations]], [[neuro-imaging]], [[statistical analyses]]), and spans many levels of analysis of the mind (from low-level learning and decision mechanisms to high-level logic and planning, from neural circuitry to modular brain organization, etc.). The term ''cognitive science'' was coined by [[H. Christopher Longuet-Higgins|Christopher Longuet-Higgins]] in his 1973 commentary on the [[Lighthill report]], which concerned the then-current state of [[Artificial Intelligence]] research.<ref>
{{sectstub}}
 
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Longuet-Higgins, H. C. (1973). "Comments on the Lighthill Report and the Sutherland Reply", in ''Artificial Intelligence: a paper symposium'', Science Research Council, 35-37</ref> In the same decade, the journal ''[[Cognitive Science (journal)|Cognitive Science]]'' and the [[Cognitive Science Society]] were founded.<ref>[http://www.cognitivesciencesociety.org/about_description.html Cognitive Science Society]</ref> Cognitive science differs from [[cognitive psychology]] in that [[algorithms]] that are intended to simulate human behavior are implemented or implementable on a computer.<ref name="IUB">[http://www.cogs.indiana.edu/general/what.html]</ref><ref name="luger">{{cite book | last = Luger | first = George | authorlink = | coauthors = | title = Cognitive science : the science of intelligent systems | publisher = [[Academic Press]] | year = 1994 |location = [[San Diego]] |isbn = 978-0124595705 }}</ref>
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== History ==
   
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Like most approaches to the mind, cognitive science can be traced back to philosophical questions, especially about the nature of knowledge. For instance, [[Plato]]'s dialog [[Meno]], where he investigates the source of knowledge, can be seen as a foundational text.
==Principles of Cognitive Science==
 
===Approaches===
 
There are several approaches of study in the field of cognitive science including symbolic, connectionist, and dynamic systems.
 
   
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The modern culture of cognitive science can be traced back to the early [[cybernetics| cyberneticists]] in the 1930s and 1940s, such as [[Warren McCulloch]] and [[Walter Pitts]], who sought to understand the organizing principles of the mind . McCulloch and Pitts essentially invented the [[neural network]], but did not have the computational tools to develop it into modern form.
* Symbolic - That intelligence can be explained by means of systematic, discrete instructions not unlike the way in which a computer works.
 
* Connectionist - The means of explanation is by using artificial [[neural networks]].
 
* Dynamic Systems - Cognition can be explained by means of a continuous system in which everything is interrelated, like the [[Centrifugal governor|Watt Governor]].
 
   
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Another precursor was the early development of the [[theory of computation]] and the [[digital computer]] in the 1940s and 1950s. [[Alan Turing]] and [[John von Neumann]] were instrumental in these developments. The modern computer, or [[Von Neumann machine]], would play a central role in cognitive science, both as a metaphor for the mind, and as a tool for investigation.
===Levels of analysis===
 
One of the central principles in the symbolic approach to cognitive science is that (1) there are different levels of analysis (LOA) from which the brain and behavior can be studied, and (2) mental phenomena are best studied from ''multiple'' levels of analysis. These levels are usually broken into three groups, based on [[David Marr|Marr]]'s description of them:
 
   
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In [[1959]], [[Noam Chomsky]] published a scathing review of [[B. F. Skinner]]'s book [[Verbal Behavior]]. At the time, Skinner's [[behaviorist]] paradigm dominated psychology: Most psychologists focused on functional relations between stimulus and response, without positing internal representations. Chomsky's work showed that in order to explain language, we needed a theory like his [[generative grammar]], which not only attributed internal representations but characterized their underlying order. This hugely successful theory would inspire much later cognitive science.
* Computational (Behavioral) level: describes the directly observable output (or behavior) of a system.
 
* Algorithmic (Functional) level: describes how information is processed to produce the behavioral output.
 
* Implementational (Physical) level: describes the physical substrate that the system consists of (e.g. the brain; neurons).
 
   
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In the 1970s and early 1980s, much cognitive science research focused on the possibility of [[artificial intelligence]]. Researchers such as [[Marvin Minsky]] would write computer programs in languages such as [[LISP]] to attempt to formally characterize the steps that human beings went through, for instance, in making decisions and solving problems, in the hope of better understanding human thought, and also in the hope of creating artificial minds. This approach is known as "symbolic AI".
An analogy often used to describe LOA is to compare the brain to a [[computer]]. The physical level would consist of the computer's [[hardware]], the behavioral level represents the computer's [[software]], and the functional level would be the computer's [[operating system]], which allows the software and hardware components to communicate.
 
   
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Eventually the limits of the symbolic AI research program became apparent. For instance, it seemed to be unrealistic to comprehensively list human knowledge in a form usable by a symbolic computer program. The late 80s and 90s saw the rise of [[neural networks]] and [[connectionism]] as a research paradigm.
A central tenet of cognitive science is that a complete understanding of the mind/brain cannot be attained by studying only a single level. For example, consider the problem of remembering a phone number and recalling it later. How does this process occur? One approach would be to study behavior through direct observation. You could present a person with a phone number, ask them to recall it after some delay, and measure their accuracy. Another approach would be to study the firings of individual neurons while a person is trying to remember the phone number. Neither of these experiments on their own would fully explain ''how'' the process of remembering a phone number works. Even if we had the technology available to map out every neuron in the brain in real-time, and we knew when each neuron was firing, we still would not know how a particular firing of neurons translates into the observed behavior. Thus, we need an understanding of how these two levels relate to each other. This can be provided by a functional level account of the process. By studying a particular phenomenon from multiple levels, we are better able to understand the processes that occur in the brain to give rise to a particular behavior.
 
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Under this point of view, often attributed to [[James McClelland]] and [[David Rumelhart]], the mind could be characterized as a set of complex associations, represented as a layered network. Critics argue that there are some phenomena which are better captured by symbolic models, and that connectionist models are often so complex as to have little explanatory power. But the flexibility and biological plausibility of these models made them very successful.
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Today a plurality of approaches exist, from connectionism, to a focus on dynamical systems models, to attempts to reintroduce symbolic models using tools from modern computer science such as [[machine learning]].
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==Principles==
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===Levels of analysis===
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A central tenet of cognitive science is that a complete understanding of the mind/brain cannot be attained by studying only a single level. For example, consider the problem of remembering a phone number and recalling it later. How does this process occur? One approach would be to study behavior through direct observation. A person could be presented with a phone number, asked to recall it after some delay. Then the accuracy of the response could be measured. Another approach would be to study the firings of individual neurons while a person is trying to remember the phone number. Neither of these experiments on their own would fully explain ''how'' the process of remembering a phone number works. Even if the technology to map out every neuron in the brain in real-time were available, and it were known when each neuron was firing, it would still be impossible to know how a particular firing of neurons translates into the observed behavior. Thus an understanding of how these two levels relate to each other is needed. This can be provided by a functional level account of the process. Studying a particular phenomenon from multiple levels creates a better understanding of the processes that occur in the brain to give rise to a particular behavior.
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[[David Marr (psychologist)|Marr]]<ref>Marr, D. (1982). ''Vision: A Computational Investigation into the Human Representation and Processing of Visual Information''. W. H. Freeman.</ref> gave a famous description of three levels of analysis:
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# the ''computational theory'', specifying the goals of the computation;
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# ''representation and algorithm'', giving a representation of the input and output and the algorithm which transforms one into the other; and
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# the ''hardware implementation'', how algorithm and representation may be physically realized.
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(See also the entry on [[Functionalism (philosophy of mind)|functionalism]].)
   
 
===Interdisciplinary nature===
 
===Interdisciplinary nature===
Closely related to LOA (Levels of Analysis?), '''cognitive science''' is a very interdisciplinary field and tends to view the world outside the mind much as other sciences do. Thus, it has an objective: observer-independent existence. The field is usually seen as compatible with and interdependent with the physical sciences, and uses of the [[scientific method]], as well as [[simulation]] or [[model (abstract)|modeling]], often comparing the output of models with aspects of human behavior. Still, there is much disagreement about the exact relationship between cognitive science and other fields, and the inter-disciplinary nature of cognitive science is largely both unrealized and circumscribed.
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Cognitive science is an interdisciplinary field with contributors from various fields, including [[psychology]], [[neuroscience]], [[linguistics]], [[philosophy of mind]], [[computer science]], [[anthropology]], [[sociology]], and [[biology]]. Cognitive science tends to view the world outside the mind much as other sciences do. Thus it too has an objective, observer-independent existence. The field is usually seen as compatible with the physical sciences, and uses the [[scientific method]] as well as [[simulation]] or [[model (abstract)|modeling]], often comparing the output of models with aspects of human behavior. Still, there is much disagreement about the exact relationship between cognitive science and other fields, and the interdisciplinary nature of cognitive science is largely both unrealized and circumscribed.{{Fact|date=October 2008}}
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Many, but not all, who consider themselves cognitive scientists have a [[functionalism (philosophy of mind)|functionalist]] view of the mind&mdash;the view that mental states are classified functionally, such that any system that performs the proper function for some mental state is considered to be in that mental state. Thus, according to functionalism about the mind, even non-human systems, such as other animal species, alien life forms, or advanced computers can, in principle, have mental states. This perspective is one of the reasons the term "cognitive science" is not exactly coextensive with [[neuroscience]], [[psychology]], or some combination of the two.{{Fact|date=October 2008}}
   
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From the external point of view, the largest interdisciplinary context of cognitive science is [[systemics]]. It includes the [[socio-cognitive]] extension of the cognition models and theories over different social environments social systems, with the emphasis on [[distributed cognition]] and [[intelligence]].{{Fact|date=October 2008}}
Many but not all who consider themselves cognitive scientists have a [[functionalism (philosophy of mind)|functionalist]] view of mind/intelligence, which means that, at least in theory, they study mind and intelligence from the perspective that these attributes could perhaps (at least someday) be properly attributed not only to human beings but also to, say, other animal species, alien life forms or particularly advanced computer systems. This perspective is one of the reasons the term "cognitive science" is not exactly coextensive with [[neuroscience]], [[psychology]], or some combination of the two.
 
   
===''Cognitive'' science - The term===
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===''Cognitive'' science: the term===
The term "cognitive" in "cognitive science" is "used for any kind of mental operation or structure that can be studied in precise terms." (Lakoff and Johnson, 1999) This conceptualization is very broad, and should not be confused with how "cognitive" is used in some traditions of analytic philosophy, where "cognitive" has to do only with formal rules and truth conditional semantics. (Nonetheless, that interpretation would bring one close to the historically dominant school of thought within cognitive science on the nature of cognition - that it is essentially symbolic, propositional, and logical.)
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The term "cognitive" in "cognitive science" is "used for any kind of mental operation or structure that can be studied in precise terms" ([[George Lakoff|Lakoff]] and [[Mark Johnson (professor)|Johnson]], 1999). This conceptualization is very broad, and should not be confused with how "cognitive" is used in some traditions of [[analytic philosophy]], where "cognitive" has to do only with formal rules and truth conditional semantics. (Nonetheless, that interpretation would bring one close to the historically dominant school of thought within cognitive science on the nature of cognition - that it is essentially symbolic, propositional, and logical.)
   
The earliest entries for the word "''cognitive''" in the [[Oxford English Dictionary | OED]] take it to mean roughly ''pertaining to "to the action or process of knowing"''. The first entry, from 1586, shows the word was at one time used in the context of discussions of [[Plato | Platonic]] theories of [[knowledge]]. Most in cognitive science, however, presumably do not believe their field is the study of anything as certain as the knowledge sought by Plato.
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The earliest entries for the word "''cognitive''" in the [[Oxford English Dictionary|OED]] take it to mean roughly ''pertaining "to the action or process of knowing"''. The first entry, from 1586, shows the word was at one time used in the context of discussions of [[Plato]]nic theories of [[knowledge]]. Most in cognitive science, however, presumably do not believe their field is the study of anything as certain as the knowledge sought by Plato.
   
==Scope of cognitive science==
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==Scope==
'''Cognitive science''' is a large field, and covers a wide array of topics on cognition. However, it should be recognized that cognitive science is not equally concerned with every topic that might bear on the nature and operation of the mind or intelligence. Social and cultural factors, emotion, consciousness, [[animal cognition]], [[comparative psychology|comparative]] and [[evolutionary psychology|evolutionary]] approaches are frequently de-emphasized or excluded outright, often based on key philosophical conflicts. Some within the cognitive science community, however, consider these to be vital topics, and advocate the importance of investigating them.
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'''Cognitive science''' is a large field, and covers a wide array of topics on cognition. However, it should be recognized that cognitive science is not equally concerned with every topic that might bear on the nature and operation of the mind or intelligence. Social and cultural factors, emotion, consciousness, [[animal cognition]], [[comparative psychology|comparative]] and [[evolutionary psychology|evolutionary]] approaches are frequently de-emphasized or excluded outright, often based on key philosophical conflicts. Another important mind-related subject that the cognitive sciences tend to avoid is the existence of [[qualia]], with discussions over this issue being sometimes limited to only mentioning qualia as a philosophically-open matter. Some within the cognitive science community, however, consider these to be vital topics, and advocate the importance of investigating them.<ref>A number of authors consider the qualia problem to be part of the cognitive science field, e.g. [http://portal.acm.org/citation.cfm?id=166791.166844 Some philosophical issues in cognitive science: qualia, intentionality, and the mind-body problem], [http://chil.rice.edu/byrne/Pubs/cogsci96.pdf Qualia: The Hard Problem], and indeed the entire discipline of philosophy as being part of the cog sci field, e.g. [http://ls.berkeley.edu/ugis/cogsci/major/about.php What is Cognitive Science?], while other reputable sources that cover both qualia and cog sci do not draw any obvious connection between them, e.g. the [http://plato.stanford.edu Stanford encyclopedia of philosophy] (Jan 2008 online edition) does have full-size articles on both [http://plato.stanford.edu/entries/qualia/ qualia] and [http://plato.stanford.edu/entries/cognitive-science/ cog sci], but qualia are not even mentioned in the cog sci article while cog sci is not mentioned in the qualia article.</ref>
   
 
Below are some of the main topics that '''cognitive science''' is concerned with. This is not an exhaustive list, but is meant to cover the wide range of intelligent behaviors. See [[List of cognitive science topics]] for a list of various aspects of the field.
 
Below are some of the main topics that '''cognitive science''' is concerned with. This is not an exhaustive list, but is meant to cover the wide range of intelligent behaviors. See [[List of cognitive science topics]] for a list of various aspects of the field.
   
 
===Artificial intelligence===
 
===Artificial intelligence===
''Main article:'' [[Artificial intelligence]]
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{{Main|Artificial intelligence}}
   
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''"... One major contribution of AI and cognitive science to psychology has been the information processing model of human thinking in which the metaphor of brain-as-computer is taken quite literally.
Artificial intelligence (AI) involves the study of cognitive phenomena in machines. One of the practical goals of AI is to implement aspects of human intelligence in computers. Computers are also widely used as a tool with which to study cognitive phenomena. [[computer model|Computational modeling]] uses simulations to study how human intelligence may be structured. (See the section on computational modeling in the Research Methods section.)
 
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."'' [http://www.aaai.org/AITopics/html/cogsci.html#simon AAAI Web pages].
   
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Artificial intelligence (AI) involves the study of cognitive phenomena in machines. One of the practical goals of AI is to implement aspects of human intelligence in computers. Computers are also widely used as a tool with which to study cognitive phenomena. [[computer model|Computational modeling]] uses simulations to study how human intelligence may be structured. <ref>Sun, Ron (ed.) (2008). The Cambridge Handbook of Computational Psychology. Cambridge University Press, New York. </ref> (See the section on computational modeling in the Research Methods section.)
There is some debate in the field as to whether the mind is "best" viewed as a huge array of small but individually feeble elements (i.e. neurons), or as a collection of higher-level structures, such as "symbols", "schemas", "plans", and rules. The former view uses [[connectionism]] to study the mind, whereas the latter emphasizes symbolic computations. One way to view the issue is whether it is possible to accurately simulate a human brain on a computer without accurately simulating the neurons that make up the human brain.
 
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There is some debate in the field as to whether the mind is best viewed as a huge array of small but individually feeble elements (i.e. neurons), or as a collection of higher-level structures such as symbols, schemas, plans, and rules. The former view uses [[connectionism]] to study the mind, whereas the latter emphasizes symbolic computations. One way to view the issue is whether it is possible to accurately simulate a human brain on a computer without accurately simulating the neurons that make up the human brain.
   
 
===Attention===
 
===Attention===
''Main article: [[Attention]]''
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{{Main|Attention}}
   
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Attention is the selection of important information. The human mind is bombarded with millions of stimuli and it must have a way of deciding which of this information to process. Attention is sometimes seen as a spotlight, meaning one can only shine the light on a particular set of information. Experiments that support this metaphor include the [[dichotic listening]] task (Cherry, 1957) and studies of inattentional blindness (Mack and Rock, 1998). In the dichotic listening task, subjects are bombarded with two different messages, one in each ear, and told to focus on only one of the messages. At the end of the experiment, when asked about the content of the unattended message, subjects cannot report it.
{{sectstub}}
 
   
 
===Language processing===
 
===Language processing===
[[Image:Cgisf-tgg.png|thumb|230px||An example of a phrase structure tree. This is one way of representing human language that shows that different components are organized hierarchically.]]
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[[Image:Cgisf-tgg.svg|thumb|230px||A [[Colorless green ideas sleep furiously|well known example]] of a [[Phrase structure rules|Phrase structure tree]]. This is one way of representing human language that shows how different components are organized hierarchically. ]]
''Main articles:'' [[Cognitive linguistics]], [[Language]], [[Linguistics]], [[Psycholinguistics]]
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{{Main|Cognitive linguistics|Language|Linguistics|Psycholinguistics}}
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The ability to learn and understand language is an extremely complex process. Language is acquired within the first few years of life, and all humans under normal circumstances are able to acquire language proficiently. Some of the driving research questions in studying how the brain processes language include: (1) To what extent is linguistic knowledge innate or learned?, (2) Why is it more difficult for adults to acquire a second-language than it is for infants to acquire their first-language?, and (3) How are humans able to understand novel sentences?
   
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The study of language processing ranges from the investigation of the sound patterns of speech to the meaning of words and whole sentences. [[Linguistics]] often divides language processing into [[orthography]], [[phonology]] and [[phonetics]], [[syntax|syntactics]], [[semantics]], and [[pragmatics]]. Many aspects of language can be studied from each of these components and from their interaction.
The ability to learn and understand language is an extremely complex process. Language is acquired within the first few years of life, and all humans under normal circumstances are able to acquire language proficiently. Some of the driving research questions in studying how the brain processes language include: (1) To what extent is linguistic knowledge innate or learned?, (2) Why is it more difficult for adults to acquire a second-language than it is for infants to acquire their first-language?, (3) How are humans able to understand novel sentences they have never heard before?
 
   
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The study of language processing in '''cognitive science''' is closely tied to the field of linguistics. Linguistics was traditionally studied as a part of the humanities, including studies of history, art and literature. In the last fifty years or so, more and more researchers have studied knowledge and use of language as a cognitive phenomenon, the main problems being how knowledge of language can be acquired and used, and what precisely it consists of. [[Linguistics|Linguists]] have found that, while humans form sentences in ways apparently governed by very complex systems, they are remarkably unaware of the rules that govern their own speech. Thus linguists must resort to indirect methods to determine what those rules might be. If speech is indeed governed by rules, they appear to be opaque to any conscious consideration.
The study of language processing ranges from the investigation of the sound patterns of speech to the meaning of words and whole sentences. [[Linguistics]] often divides the types of language processing into orthography, [[phonology]] and [[phonetics]], [[syntax|syntactics]], [[semantics]], and [[pragmatics]]. Many aspects of language can be studied from each of these components and from their interaction.
 
   
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One approach to cognitive issues in language is the [[pragmatics]] of language, that is, the current use of the language by a real speaker. From a pragmatic analytical perspective it is possible to show that some people who have a profession in which they categorically work with language (e.g. journalists) have a behavior which is not predictable by known theories. The pragmatic approach is also useful in the study of [[Collective decision-making#Decision making in groups|collective distributed decision making]], particularly in broadcasted systems (for instance aviation approach control - AAP).
The study of language processing in '''cognitive science''' is closely tied to the field of linguistics. Linguistics was traditionally studied as a part of the humanities, including studies of history, art and literature. In the last fifty years or so, more and more researchers have studied knowledge and use of language as a cognitive phenomenon, the main problems being how knowledge of language can be acquired and used, and what, precisely it consists of. [[Linguist]]s have found that, while humans form sentences in ways apparently governed by very complex systems, they are remarkably unaware of the rules that govern their own speech. Thus, linguists must resort to indirect methods to determine what those rules might be. If speech is indeed governed by rules, they appear to be opaque to any conscious consideration.
 
   
 
===Learning and development===
 
===Learning and development===
''Main articles:'' [[Learning]], [[Developmental psychology]]
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{{Main|Learning|Developmental psychology}}
   
Learning and development are the processes by which we acquire information over time. Infants are born with little or no knowledge (depending on how knowledge is defined), yet they rapidly acquire the ability to use language, walk, and recognize people and objects. Research in learning and development aim to explain the mechanisms by which these processes might take place.
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Learning and development are the processes by which we acquire knowledge and information over time. Infants are born with little or no knowledge (depending on how knowledge is defined), yet they rapidly acquire the ability to use language, walk, and recognize people and objects. Research in learning and development aims to explain the mechanisms by which these processes might take place.
   
A major question in the study of cognitive development is the extent to which certain abilities are [[innate]] or learned. This is often framed in terms of the nature versus nurture debate. The nativist view emphasizes that certain features are innate to an organism and are determined by its [[genetics|genetic]] endowment. The empiricist view, on the other hand, emphasizes that certain abilities are learned from the environment. It is clear that intelligent behavior has components that are both innate and learned, but the extent to which particular behaviors are innate is a major research question. In the area of [[language acquisition]], for example, many questions remain about whether or not a special language acquisition device is necessary to facilitate the learning of language, or if humans can learn language through more general learning processes that take advantage of the information available in the environment.
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A major question in the study of cognitive development is the extent to which certain abilities are [[innate]] or learned. This is often framed in terms of the nature versus nurture debate. The [[Psychological nativism|nativist]] view emphasizes that certain features are innate to an organism and are determined by its [[genetics|genetic]] endowment. The [[Empiricism|empiricist]] view, on the other hand, emphasizes that certain abilities are learned from the environment. Although clearly both genetic and environmental input is needed for a child to develop normally, considerable debate remains about ''how'' genetic information might guide cognitive development. In the area of [[language acquisition]], for example, some (such as [[Steven Pinker]]<ref>{{cite journal|author=Pinker S., Bloom P.|title=Natural language and natural selection|year=1990|journal=Behavioral and Brain Sciences|issue=4|pages=707–784|volume=13}}</ref>) have argued that specific information containing universal grammatical rules must be contained in the genes, whereas others (such as Jeffrey Elman and colleagues in [[Rethinking Innateness]]) have argued that Pinker's claims are biologically unrealistic. They argue that genes determine the architecture of a learning system, but that specific "facts" about how grammar works can only be learned as a result of experience.
   
 
===Memory===
 
===Memory===
''Main articles:'' [[Memory]]
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{{Main|Memory}}
   
 
Memory allows us to store information for later retrieval. Memory is often thought of consisting of both a long-term and short-term store. Long-term memory allows us to store information over prolonged periods (days, weeks, years). We do not yet know the practical limit of long-term memory capacity. Short-term memory allows us to store information over short time scales (seconds or minutes).
 
Memory allows us to store information for later retrieval. Memory is often thought of consisting of both a long-term and short-term store. Long-term memory allows us to store information over prolonged periods (days, weeks, years). We do not yet know the practical limit of long-term memory capacity. Short-term memory allows us to store information over short time scales (seconds or minutes).
   
Memory is also often grouped into declarative and procedural forms. Declarative memory refers to our memory for facts and specific knowledge (e.g., Who was the first president of the U.S.?). Procedural memory allows us to remember actions and motor sequences (e.g. how to ride a bicycle).
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Memory is also often grouped into declarative and procedural forms. [[Declarative memory]]--grouped into subsets of [[Semantic memory|semantic]] and [[Episodic memory|episodic forms of memory]]--refers to our memory for facts and specific knowledge, specific meanings, and specific experiences (e.g., Who was the first president of the U.S.A.?, or "What did I eat for breakfast four days ago?). [[Procedural memory]] allows us to remember actions and motor sequences (e.g. how to ride a bicycle) and is often dubbed implicit knowledge or memory .
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Cognitive scientists study memory just as psychologists do, but tend to focus in more on how memory bears on [[cognitive process]]es, and the interrelationship between cognition and memory. One example of this could be, what mental processes does a person go through to retrieve a long-lost memory? Or, what differentiates between the cognitive process of recognition (seeing hints of something before remembering it, or memory in context) and recall (retrieving a memory, as in "fill-in-the-blank")?
   
 
===Perception and action===
 
===Perception and action===
[[Image:Necker_cube.jpg|thumb|150px|The Necker cube, an example of a visual illusion.]]
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[[Image:Necker cube.svg|thumb|150px|The Necker cube, an example of an optical illusion]]
   
''Main article: [[Perception]]''
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{{Main|Perception}}
   
Perception is the ability to take in information via the [[senses]], and process it in some way. [[Visual perception|Vision]] and [[hearing]] are two dominant senses that allow us to perceive the environment. Some questions in the study of visual perception, for example, include: (1) How are we able to recognize objects?, (2) Why do we perceive a continuous visual environment, even though we only see small bits of it at any one time? One tool for studying visual perception is by looking at how people process [[visual illusions]]. The image on the right of a Necker cube is an example of a bistable percept, that is, the cube can be interpreted as being oriented in two different directions.
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Perception is the ability to take in information via the [[senses]], and process it in some way. [[Visual perception|Vision]] and [[Hearing (sense)|hearing]] are two dominant senses that allow us to perceive the environment. Some questions in the study of visual perception, for example, include: (1) How are we able to recognize objects?, (2) Why do we perceive a continuous visual environment, even though we only see small bits of it at any one time? One tool for studying visual perception is by looking at how people process [[optical illusion]]s. The image on the right of a Necker cube is an example of a bistable percept, that is, the cube can be interpreted as being oriented in two different directions.
   
 
The study of [[haptic]] ([[tactile]]), [[olfactory]], and [[gustatory]] stimuli also fall into the domain of perception.
 
The study of [[haptic]] ([[tactile]]), [[olfactory]], and [[gustatory]] stimuli also fall into the domain of perception.
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==Research methods==
 
==Research methods==
Many different methodologies are used to study '''cognitive science'''. As the field is highly interdisciplinary, research often cuts across multiple areas of study, and draws on research methods from [[psychology]], [[neuroscience]], and [[computer science]].
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Many different methodologies are used to study '''cognitive science'''. As the field is highly interdisciplinary, research often cuts across multiple areas of study, drawing on research methods from [[psychology]], [[neuroscience]], [[computer science]] and [[systems theory]].
   
 
===Behavioral experiments===
 
===Behavioral experiments===
 
In order to have a description of what constitutes intelligent behavior, one must study behavior itself. This type of research is closely tied to that in [[cognitive psychology]] and [[psychophysics]]. By measuring behavioral responses to different stimuli, one can understand something about how those stimuli are processed.
 
In order to have a description of what constitutes intelligent behavior, one must study behavior itself. This type of research is closely tied to that in [[cognitive psychology]] and [[psychophysics]]. By measuring behavioral responses to different stimuli, one can understand something about how those stimuli are processed.
   
* ''Reaction time.'' The time between the presentation of a stimulus and an appropriate response can indicate differences between two cognitive processes, and can indicate some things about their nature. For example, if in a search task the reaction times vary proportionally with the number of elements, then it is evident that this cognitive process of searching involves serial and not parallel processing.
+
* ''Reaction time.'' The time between the presentation of a stimulus and an appropriate response can indicate differences between two cognitive processes, and can indicate some things about their nature. For example, if in a search task the reaction times vary proportionally with the number of elements, then it is evident that this cognitive process of searching involves serial instead of parallel processing.
   
* ''Psychophysical responses.'' Psychophysical experiments are an old psychological technique, which have been adopted by cognitive psychology. They typically involve making judgments of some physical property, e.g. the loudness of a sound. Correlation of subjective scales between individuals can show cognitive or sensory biases as compared to actual physical measurements. Some examples include:
+
* ''Psychophysical responses.'' Psychophysical experiments are an old psychological technique, which has been adopted by cognitive psychology. They typically involve making judgments of some physical property, e.g. the loudness of a sound. Correlation of subjective scales between individuals can show cognitive or sensory biases as compared to actual physical measurements. Some examples include:
 
** sameness judgments for colors, tones, textures, etc.
 
** sameness judgments for colors, tones, textures, etc.
 
** threshold differences for colors, tones, textures, etc.
 
** threshold differences for colors, tones, textures, etc.
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===Brain imaging===
 
===Brain imaging===
  +
{{main|Neuroimaging}}
[[Image:Hypothalamus.jpg|thumb|150px||Image of the human brain. The arrow indicates the position of the hypothalamus.]]
 
  +
  +
[[Image:Hypothalamus.jpg|thumb|150px||Image of the human head with the brain. The arrow indicates the position of the [[hypothalamus]].]]
   
 
Brain imaging involves analyzing activity within the brain while performing various cognitive tasks. This allows us to link behavior and brain function to help understand how information is processed. Different types of imaging techniques vary in their temporal (time-based) and spatial (location-based) resolution. Brain imaging is often used in [[cognitive neuroscience]].
 
Brain imaging involves analyzing activity within the brain while performing various cognitive tasks. This allows us to link behavior and brain function to help understand how information is processed. Different types of imaging techniques vary in their temporal (time-based) and spatial (location-based) resolution. Brain imaging is often used in [[cognitive neuroscience]].
   
  +
* ''[[Single photon emission computed tomography]]'' and ''[[Positron emission tomography]]''. SPECT and PET use radioactive isotopes, which are injected into the subject's bloodstream and taken up by the brain. By observing which areas of the brain take up the radioactive isotope, we can see which areas of the brain are more active than other areas. PET has similar spatial resolution to fMRI, but it has extremely poor temporal resolution.
* ''[[Electroencephalography|EEG]].'' Electroencephalography (EEG) measures the electrical fields generated by large populations of neurons in the cortex by placing a series of electrodes on the scalp of the subject. This technique has an extremely high temporal resolution, but a relatively poor spatial resolution.
 
   
* ''[[functional MRI|fMRI]].'' fMRI measures the relative amount of oxygenated blood flowing to different parts of the brain. More oxygenated blood in a particular region is correlated with an increase in neural activity in that part of the brain. This allows us to localize particular functions within different brain regions. fMRI has moderate spatial and temporal resolution.
+
* ''[[Electroencephalography]]''. EEG measures the electrical fields generated by large populations of neurons in the cortex by placing a series of electrodes on the scalp of the subject. This technique has an extremely high temporal resolution, but a relatively poor spatial resolution.
   
* ''[[Positron emission tomography]].'' PET uses a radioactive isotope, usually in the form of glucose, which is injected into the subject's bloodstream and taken up by the brain. By observing which areas of the brain take up the radioactive isotope, we can see which areas of the brain are more active than other areas. PET has similar spatial resolution to fMRI, but it has extremely poor temporal resolution.
+
* ''[[Functional magnetic resonance imaging]]''. fMRI measures the relative amount of oxygenated blood flowing to different parts of the brain. More oxygenated blood in a particular region is assumed to correlate with an increase in neural activity in that part of the brain. This allows us to localize particular functions within different brain regions. fMRI has moderate spatial and temporal resolution.
   
* ''[[Optical imaging]].'' This technique uses infrared transmitters and receivers to measure the amount of light reflectance by blood near different areas of the brain. Since oxygenated and deoxygenated blood reflects light by different amounts, we can study which areas are more active (those that have more oxygenated blood). Optical imaging has moderate temporal resolution, but poor spatial resolution. It also has the advantage that it is extremely safe and can be used to study infants' brains.
+
* ''[[Optical imaging]]''. This technique uses infrared transmitters and receivers to measure the amount of light reflectance by blood near different areas of the brain. Since oxygenated and deoxygenated blood reflects light by different amounts, we can study which areas are more active (i.e., those that have more oxygenated blood). Optical imaging has moderate temporal resolution, but poor spatial resolution. It also has the advantage that it is extremely safe and can be used to study infants' brains.
   
*''[[Magnetoencephalography|MEG]].'' This technique measures magnetic fields resulting from cortical activity. It is similar to [[Electroencephalography|EEG]], except that it has improved spatial resolution and the apparatus is a helmet.<!--I need help!!-->
+
*''[[Magnetoencephalography]].'' MEG measures magnetic fields resulting from cortical activity. It is similar to [[Electroencephalography|EEG]], except that it has improved spatial resolution since the magnetic fields it measures are not as blurred or attenuated by the scalp, meninges and so forth as the electrical activity measured in EEG is. MEG uses SQUID sensors to detect tiny magnetic fields.
   
 
===Computational modeling===
 
===Computational modeling===
[[Image:MultiLayerNeuralNetwork_english.png|thumb|200px|Neural network with two layers.]]
+
[[Image:MultiLayerNeuralNetwork english.png|thumb|200px|A Neural network with two layers.]]
   
[[computer model|Computational models]] are often used to simulate specific aspects of intelligence. These models can help us understand the functional organization of a particular cognitive phenomenon.
+
[[computer model|Computational models]] require a mathematically and logically formal representation of a problem. Computer models are used in the simulation and experimental verification of different specific and general [[property|properties]] of [[intelligence]]. Computational modeling can help us to understand the functional organization of a particular cognitive phenomenon.
  +
There are two basic approaches to cognitive modeling. The first is focused on abstract mental functions of an intelligent mind and operates using symbols, and the second, which follows the neural and associative properties of the human brain, and is called subsymbolic.
   
  +
* ''Symbolic modeling'' evolved from the computer science paradigms using the technologies of [[Knowledge-based systems]], as well as a philosophical perspective, see for example "Good Old-Fashioned Artificial Intelligence" ([[GOFAI]]). They are developed by the first cognitive researchers and later used in [[information engineering]] for [[expert system]]s . Since the early 1990s it was generalized in [[systemics]] for the investigation of functional human-like intelligence models, such as [[personoid]]s, and, in parallel, developed as the [[Soar (cognitive architecture)|SOAR]] environment. Recently, especially in the context of cognitive decision making, symbolic cognitive modeling is extended to [[socio-cognitive]] approach including social and organization cognition interrelated with a sub-symbolic not conscious layer.
* ''[[Connectionism|Connectionist/neural network models]].'' Connectionism relies on the idea that the mind/brain is composed of simple nodes and that the power of the system comes primarily from the existence, and manner of connections between the simple nodes. [[Neural nets]] are textbook implementations of this approach. Some critics of this approach feel that while it may be true as a repetition of how the system works it does not have explanative powers, as complicated systems of connections with even simple rules are extremely complex, and often less interpretable than the system they model.
 
  +
* ''Subsymbolic modeling'' includes ''[[Connectionism|Connectionist/neural network models]].'' Connectionism relies on the idea that the mind/brain is composed of simple nodes and that the power of the system comes primarily from the existence and manner of connections between the simple nodes. [[Neural nets]] are textbook implementations of this approach. Some critics of this approach feel that while these models approach biological reality as a repetition of how the system works, they lack explanatory powers because complicated systems of connections with even simple rules are extremely complex and often less interpretable than the system they model.
   
  +
Other approaches gaining in popularity include the use of [[Dynamical systems]] theory and also techniques putting symbolic models and connectionist models into correspondence ([[Neural-symbolic integration]]). [[Bayesian cognitive science | Bayesian models]], often drawn from [[machine learning]], are also gaining popularity.
* ''Symbolic models.''
 
   
  +
All the above approaches tend to be generalized to the form of integrated computational models of a synthetic/abstract intelligence, in order to be applied to the explanation and improvement of individual and social/organizational [[decision-making]] and [[Psychology of reasoning|reasoning]].
* ''[[Dynamical systems]].''
 
   
 
===Neurobiological methods===
 
===Neurobiological methods===
Research methods borrowed directly from [[neuroscience]] and [[neuropsychology]] can also help us understand aspects of intelligence. This methods allow us to understand how intelligent behavior is implemented in a physical system.
+
Research methods borrowed directly from [[neuroscience]] and [[neuropsychology]] can also help us to understand aspects of intelligence. These methods allow us to understand how intelligent behavior is implemented in a physical system.
   
* ''Single-cell recording.''
+
* [[Single-cell recording]]
  +
* [[Transcranial direct current stimulation|Direct brain stimulation]]
  +
* [[Animal models]]
  +
* [[Postmortem studies]]
   
  +
==Key findings==
* ''Direct brain stimulation.''
 
  +
Cognitive science has much to its credit. Among other accomplishments, it has given rise to models of human [[cognitive bias]] and [[risk]] perception, and has been influential in the development of [[behavioral finance]], part of [[economics]]. It has also given rise to a new theory of the [[philosophy of mathematics]], and many theories of [[artificial intelligence]], [[persuasion]] and [[coercion]]. It has made its presence firmly known in the [[philosophy of language]] and [[epistemology]] - a modern revival of rationalism - as well as constituting a substantial wing of modern [[linguistics]]. Fields of cognitive science have been influential in understanding the brain's particular functional systems (and functional deficits) ranging from speech production to auditory processing and visual perception. It has made progress in understanding how damage to particular areas of the brain affect cognition, and it has helped to uncover the root causes and results of specific disfunction, such as [[dyslexia]], [[anopia]], and [[hemispatial neglect]].
   
  +
== Criticism ==
* ''Animal models.''
 
  +
The philosophical underpinnings of research in cognitive science have been criticized by philosophers and scientists alike{{Who|date=March 2009}}. In a speech given shortly before his death<ref>ref.</ref>, [[B.F. Skinner]] stated that "cognitive science is the creationism of psychology."
  +
See [[Functionalism (philosophy of mind)]] for an extended entry on criticisms.
   
  +
==Notable researchers==
* ''Lesion patients.''
 
  +
{{Seealso|List of cognitive scientists}}
   
  +
Some of the more recognized names in cognitive science are usually either the most controversial or the most cited. Within philosophy familiar names include [[Daniel Dennett]] who writes from a computational systems perspective, [[John Searle]] known for his controversial [[Chinese Room]], Jerry Fodor who advocates [[Functionalism (philosophy of mind)|functionalism]], and [[Douglas Hofstadter]], famous for writing ''[[Gödel, Escher, Bach]]'', which questions the nature of words and thought. In the realm of linguistics, [[Noam Chomsky]] and [[George Lakoff]] have been influential (both have also become notable as political commentators). In [[Artificial intelligence]] [[Marvin Minsky]] and [[Kevin Warwick]] are prominent. Popular names in the discipline of psychology include [[James McClelland]] and [[Steven Pinker]].
==Key findings==
 
'''Cognitive science''' has much to its credit. Among other accomplishments, it has given rise to models of human [[cognitive bias]] and [[risk]] perception, and has been influential in the development of [[behavioral finance]], part of [[economics]]. It has also given rise to a new theory of the [[philosophy of mathematics]], and many theories of [[artificial intelligence]], [[persuasion]] and [[coercion]]. It has made its presence firmly known in [[philosophy of language]] and [[epistemology]] - a modern revival of rationalism - as well as constituting a substantial wing of modern [[linguistics]].
 
   
  +
The academic field of cognitive science in its own right is very recently established. The [[University of California, San Diego]] was the first university in the world to establish a cognitive science department and the first Ph.D. in cognitive science was awarded to [[Agneta Gulz]] of [[Lund University]] in 1991.<ref>http://www.linguistlist.org/issues/19/19-2813.html</ref><ref>http://www.cogsci.ucsd.edu/index.php?cat=about&page=overview</ref><ref>http://www.lucs.lu.se/Agneta.Gulz/</ref>
Discovery of systemic human [[cognitive bias]], usually credited to [[Amos Tversky]] and [[Daniel Kahneman]], 1967. Basis of [[behavioral finance]].
 
   
  +
==See also==
Assertion of equivalence of [[Euler's identity]] (basis of complex analysis in mathematics) with basic cognitive processes, [[George Lakoff]] and [[Rafael E. Núñez]], 2000. Basis of the [[cognitive science of mathematics]].
 
  +
{{wikiversity}}<br><br><br>
  +
{{Portal|Thinking}}
  +
{{portal|Thinking|Brain.png}}
   
==Notable researchers in cognitive science and related fields==
 
* By Respective Areas
 
<table cellspacing=5>
 
<tr><th>Psychology</th><th>Philosophy</th><th>Neuroscience</th>
 
<th>Linguistics</th><th>Computer Science</th></tr>
 
<tr>
 
<td valign=top>
 
* [[Leon Festinger]]
 
* [[Lawrence Barsalou]]
 
* [[Lera Boroditsky]]
 
* [[Robert Goldstone]]
 
* [[Daniel Kahneman]]
 
* [[James McClelland]]
 
* [[George A. Miller]]
 
* [[Steven Pinker]]
 
* [[Jonathan Potter]]
 
* [[Eleanor Rosch]]
 
* [[Linda B. Smith]]
 
* [[Anne Treisman]]
 
</td>
 
<td valign=top>
 
* [[David Chalmers]]
 
* [[Patricia Churchland]]
 
* [[Paul Churchland]]
 
* [[Andy Clark]]
 
* [[Daniel Dennett]]
 
* [[Jerry Fodor]]
 
* [[Stephen Laurence]]
 
* [[Colin McGinn]]
 
* [[Roger Penrose]]
 
* [[Karl Popper]]
 
* [[John Searle]]
 
* [[Stephen Stich]]
 
* [[Paul Thagard]]
 
* [[Tim van Gelder]]
 
</td>
 
<td valign=top>
 
* [[Antonio Damasio]]
 
* [[John Carew Eccles|John Eccles]]
 
* [[Gerald Edelman]]
 
* [[Andrew and Alexander Fingelkurts]]
 
* [[Michael Gazzaniga]]
 
* [[Christof Koch]]
 
* [[Brenda Milner]]
 
* [[Karl Pribram]]
 
* [[Vilayanur S. Ramachandran]]
 
* [[Olaf Sporns]]
 
</td>
 
<td valign=top>
 
* [[Noam Chomsky]]
 
* [[Alan Prince]]
 
* [[Ray Jackendoff]]
 
* [[George Lakoff]]
 
</td>
 
<td valign=top>
 
* [[David Kirsh]]
 
* [[Douglas Hofstadter]]
 
* [[Marvin Minsky]]
 
* [[Seymour Papert]]
 
* [[Roger Schank]]
 
* [[Herbert Simon]]
 
* [[Alan Turing]]
 
</td>
 
</tr>
 
<tr><th colspan=4>Other/Misc Categories</th></tr>
 
<tr><td colspan=4>
 
* [[Margaret ('Maggie') Boden]]
 
* [[Kenneth Craik]]
 
* [[Friedrich Hayek]]
 
* [[Christopher Longuet-Higgins]]
 
* [[Edwin Hutchins]]
 
* [[Rafael E. Núñez]]
 
   
  +
{{MultiCol}}
</td></tr></table>
 
   
  +
* [[Affective science]]
==See also==
 
* [[psychology]]
+
* [[Artificial intelligence]]
  +
* [[Cognitive science of mathematics]]
* [[neuroscience]]
 
  +
* [[Cognitive science of religion]]
* [[Neural Darwinism]]
 
* [[Society of Mind theory]]
+
* [[Cognitive bias]]
  +
* [[Cognitive Informatics]]
* [[cognitive science of mathematics]]
 
* [[cognitive bias]]
+
* [[Cognitive linguistics]]
* [[cognitive linguistics]]
+
* [[Cognitive neuropsychology]]
* [[cognitive neuropsychology]]
+
* [[Cognitive neuroscience]]
* [[cognitive neuroscience]]
+
* [[Cognitive psychology]]
* [[notation bias]]
+
* [[Computational neuroscience]]
* [[neural network]]
+
* [[Decision theory]]
* [[neuropsychology]]
+
* [[Decision field theory]]
  +
* [[computational neuroscience]]
 
  +
{{ColBreak}}
* [[simulated consciousness]]
 
  +
* [[Dynamicism]]
* [[artificial consciousness]]
 
  +
* [[Educational psychology]]
* [[List_of_publications_in_biology#Cognitive science| Important publications in cognitive science]]
 
  +
* [[Heterophenomenology]]
  +
* [[Human Cognome Project]]
  +
* [[Indiana Archives of Cognitive Science]]
  +
* [[Informatics (academic field)|Informatics]]
  +
* [[Embodied cognitive science]]
  +
* [[Embodied cognition]]
  +
* [[Enactivism]]
  +
* [[Linguistics]]
 
* [[List of cognitive scientists]]
 
* [[List of cognitive scientists]]
 
* [[List of institutions granting degrees in cognitive science]]
 
* [[List of institutions granting degrees in cognitive science]]
  +
* [[Neural Darwinism]]
   
  +
{{ColBreak}}
==External links==
 
  +
* [[Neural network]]
  +
* [[Neuropsychology]]
  +
* [[Neuroscience]]
  +
* [[Notation bias]]
  +
* [[Personal information management| Personal information management (PIM)]]
  +
* [[Philosophy of mind]]
  +
* [[Psychology]]
  +
* [[Simulated consciousness]]
  +
* [[Situated cognition]]
  +
* [[Society of Mind theory]]
  +
* [[Speech-Language Pathology]]
  +
* [[Concept Mining]]
  +
* [[Thought]]
  +
{{EndMultiCol}}
  +
  +
==Notes==
  +
{{reflist}}
  +
  +
{{No footnotes|date=March 2009}}
  +
{{refbegin}}
  +
# Baumgartner, P., et al. Eds. (1995). ''Speaking Minds: Interviews With Twenty Eminent Cognitive Scientists.'' Princeton, NJ: Princeton University Press.
  +
# Bechtel, W. et al. Ed. (1999). ''A Companion to Cognitive Science. Blackwell Companions to Philosophy''. Malden, MA: Blackwell Publishers.
  +
# Damasio, A. R. (1994). ''Descartes' Error: Emotion, Reason and the Human Brain.'' New York: Grosset/Putnam.
  +
# Gardner, H. (1985). ''The Mind's New Science.'' New York: Basic Books.
  +
# Gazzaniga, M. S. Ed. (1996). ''Conversations in the Cognitive Neurosciences.'' New York: The MIT Press.
  +
# Hunt, M. (1982). ''The Universe Within: A New Science Explores the Human Mind.'' Brighton: The Harvester Press.
  +
# Lakoff, G and Johnson, M. (1999). ''Philosophy In The Flesh.'' New York: Basic Books.
  +
# Port, Robert F. and vanGelder, Tim (1995). ''Mind as Motion: Explorations in the Dynamics of Cognition''. Cambridge, MA: The MIT Press. ISBN 0262161508 .
  +
# Sun, Ron & L. Bookman, (eds.), Computational Architectures Integrating Neural and Symbolic Processes. Kluwer Academic Publishers, Needham, MA. 1994.
  +
# Thagard, P. (2nd, 2005). ''Mind : Introduction to Cognitive Science''. Cambridge, MA: The MIT Press.
  +
# Thelen, Esther and Smith, Linda B. (1996). ''A Dynamic Systems Approach to the Development of Cognition and Action''. Cambridge, MA: The MIT Press. ISBN 026270059X .
  +
# Gardner, Howard (1987). ''The Minds New Science: A History of the Cognitive Revolution''. New York: Basic Books.
  +
{{refend}}
   
===Education===
+
==Further reading==
  +
;Education
 
* [http://career.berkeley.edu/Major/CogSci.stm Berkeley's "What can I do with a major in cognitive science?"]
 
* [http://career.berkeley.edu/Major/CogSci.stm Berkeley's "What can I do with a major in cognitive science?"]
  +
* [http://www.cogs.indiana.edu/iacs/index.html Indiana University's iCogSci project]
  +
* [http://web.mit.edu/bcs/ MIT: Department of Brain and Cognitive Sciences]
   
===Definitions===
+
;Definitions
* [http://plato.stanford.edu/entries/cognitive-science/ Stanford Encyclopedia of Philosophy: Cognitive Science]
+
* {{sep entry|cognitive-science|Cognitive Science|Paul Thagard}}
  +
* [http://www.aaai.org/AITopics/html/cogsci.html#simon Cognitive Science - American Assoc. for Artificial Intelligence]
 
* [http://www.aiknow.net aiKnow: Cognitive Artificial Intelligence]
 
* [http://www.aiknow.net aiKnow: Cognitive Artificial Intelligence]
 
* [http://cognet.mit.edu/ MIT CogNet]
 
* [http://cognet.mit.edu/ MIT CogNet]
   
  +
;History
===List of People===
 
  +
*[http://www.comp.leeds.ac.uk/ai12/history.html Dr. Roy Ruddle's history page at the University of Leeds]
  +
*[http://www.rc.umd.edu/cstahmer/cogsci/ Carl Stahmer's history page at the University of Santa Barbara]
  +
  +
;List of People
 
* [http://carbon.cudenver.edu/~mryder/itc_data/cogsci.html List of leading thinkers in cognitive science]
 
* [http://carbon.cudenver.edu/~mryder/itc_data/cogsci.html List of leading thinkers in cognitive science]
   
  +
;Publications & Publishers
==References==
 
  +
*[http://www.cognitivesciencesociety.org/ The Journal of Cognitive Science]
* Baumgartner, P., et. al. Eds. (1995). ''Speaking Minds: Interviews With Twenty Eminent Cognitive Scientists.'' Princeton, New Jersey: Princeton University Press.
 
  +
* [http://www.cogsci.rpi.edu/CSJarchive/ Cognitive Science Journal Archive]: Archive of the ''Cognitive Science'' journal, plus conference proceedings and supplemental materials
* Bechtel, W. et. al. Ed. (1999). ''A Companion to Cognitive Science. Blackwell Companions to Philosophy''. Malden, Massachusetts: Blackwell Publishers.
 
  +
* [http://www.elsevier.com/locate/cogsys Cognitive Systems Research]
* Damasio, A. R. (1994). ''Descartes' Error: Emotion, Reason and the Human Brain.'' New York: Grosset/Putnam.
 
  +
*[http://mitpress.mit.edu The MIT Press]
* Gardner, H. (1985). ''The Minds New Science.'' New York: Basic Books.
 
  +
*[http://www.sfu.ca/cognitive-science/journal/ Canadian Undergraduate Journal of Cognitive Science]
* Gazzaniga, M. S. Ed. (1996). ''Conversations in the Cognitive Neurosciences.'' New York: The MIT Press.
 
  +
*[http://www.cogs.indiana.edu/iacs/journal.html Indiana Undergraduate Journal of Cognitive Science]
* Lakoff, G and Johnson, M. (1999). ''Philosophy In The Flesh.'' New York: Basic Books.
 
  +
*[http://www.wiley.com/wires]: Wiley Interdisciplinary Reviews in Cognitive Science; launching in January 2010
* Luger, G. (1994). ''Cognitive science : the science of intelligent systems''. San Diego: Academic Press.
 
* Thagard, P. (2nd, 2005). ''Mind : Introduction to Cognitive Science''. Cambridge, Massachusetts: The MIT Press.
 
   
  +
;Classic Texts
  +
*{{cite book | first=Noam| last=Chomsky| title=Aspects of the Theory of Syntax| authorlink=Noam Chomsky| year=1965 | publisher=[[The MIT Press]] | isbn=978-0-262-53007-1}}
   
  +
*{{cite book | first=Patricia Smith| last=Churchland| authorlink=Patricia Churchland|title=Neurophilosophy: Toward a Unified Science of the Mind-Brain| year=1986 | publisher=[[The MIT Press]] | isbn=978-0-262-03116-5}}
[[Category:Cognitive science| ]]
 
  +
[[Category:Psychology]]
 
  +
*{{cite book | first=Daniel C.| last=Dennett| authorlink=Daniel Dennett|title=Brainstorms: Philosophical Essays on Mind and Psychology | year=1981 | publisher=[[The MIT Press]] | isbn=978-0-262-54037-7}}
[[Category:Interdisciplinary fields]]
 
  +
  +
*{{cite book | first=Jerry A.| last=Fodor| authorlink=Jerry Fodor|title=The Modularity of Mind | year=1983 | publisher=[[The MIT Press]] | isbn=978-0-262-56025-2}}
  +
  +
*{{cite book | first=Michael S.| last=Gazzaniga (ed.)| authorlink=Michael Gazzaniga |title=The Cognitive Neurosciences III| year=2004 | publisher=[[The MIT Press]] | isbn=978-0-262-07254-0}}
  +
  +
*{{cite book | first=Paul W.| last=Glimcher| title=Decision, Uncertainty, and the Brain| year=2003| publisher=[[The MIT Press]] | isbn=978-0-262-57227-9}}
  +
  +
*{{cite book | first=Marvin L.| last=Minsky| coauthors=Seymour A. Papert| authorlink=Marvin Minsky |title=Perceptrons: An Introduction to Computational Geometry | year=1969 | publisher=[[The MIT Press]] | isbn=0-262-63111-2}}
  +
  +
*{{cite book | first=Alva| last=Noe| title=Action in Perception| year=2005| publisher=[[The MIT Press]] | isbn=978-0-262-14088-1}}
  +
  +
*{{cite book | first=Hilary| last=Putnam| authorlink=Hilary Putnam| title=Representation and Reality| year=1988 | publisher=[[The MIT Press]] | isbn=978-0-262-66074-7}}
  +
  +
*{{cite book | first=Zenon| last=Pylyshyn| authorlink=Zenon Pylyshyn| title=Computation and Cognition: Toward a Foundation for Cognitive Science | year=1986 | publisher=[[The MIT Press]] | isbn=978-0-262-66058-7}}
  +
  +
*{{cite book | first=David E.| last=Rumelhart| authorlink=David Rumelhart|coauthors=James L. McClelland and the PDP Research Group|
  +
  +
title=Parallel Distributed Processing: Explorations in the Microstructure of Cognition|year=1987 | publisher=[[The MIT Press]] | isbn=0-262-63112-9}}
  +
  +
*{{cite book | first=John| last=Searle| authorlink=John Searle| title=The Rediscovery of the Mind|year=1992 | publisher=[[The MIT Press]] | isbn=978-0-262-69154-3}}
  +
  +
*{{cite book | first=Herbert A.| last=Simon| authorlink=Herbert Simon |title=The Sciences of the Artificial | year=1970 | publisher=[[The MIT Press]] | isbn=978-0-262-69191-8}}
  +
  +
*{{cite book | first=Willard| last=Van Orman Quine| authorlink=Willard Van Orman Quine| title=[[Word and Object]] | year=1964 | publisher=[[The MIT Press]] | isbn=978-0-262-67001-2}}
  +
  +
*{{cite book | first=Lev| last=Vygotsky| authorlink=Lev Vygotsky|title=Thought and Language | year=1962 | publisher=[[The MIT Press]] | isbn=978-0-262-72010-6}}
  +
  +
*{{cite book | first=Norbert| last=Wiener| authorlink=Norbert Wiener| title=Cybernetics or Control and Communication in the Animal and the Machine| year=1948| publisher=[[The MIT Press]] | isbn=978-0-262-73009-9}}
  +
  +
*{{cite book | first=Robert Andrew | last=Wilson | coauthors=Keil, Frank C. (Eds.)| title=The MIT Encyclopedia of the Cognitive Sciences (MITECS) | year=2001 | publisher=[[The MIT Press]] | isbn=0-262-73144-7 | url = http://books.google.com/books?id=-wt1aZrGXLYC&printsec=frontcover | location = Cambridge, Massachusetts}}
  +
  +
;General
  +
  +
*{{cite book | first=Lila R. | last=Gleitman | coauthors= Mark Liberman (Eds.)| title=An Invitation to Cognitive Science, Vol. 1: Language | year=1995 | publisher=The MIT Press | id=ISBN 978-0262650441}}
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*{{cite book | first=Daniela | last=Isac | coauthors= Charles Reiss | title= I-language: An Introduction to Linguistics as Cognitive Science|url=http://linguistics.concordia.ca/i-language/ | year=2008 | publisher=Oxford University Press| isbn=978-0199534203}}
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*{{cite book | first=Daniel D. | last=Hutto | title=Folk Psychological Narratives: The Sociocultural Basis of Understanding Reasons | year=2008 | publisher=The MIT Press | isbn=978-0-262-08367-6}}
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*{{cite book | first=Ron | last=Sun | title=The Cambridge Handbook of Computational Psychology | year=2008 |publisher=Cambridge University Press, New York}}
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==External links==
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* [http://www.cognitivesciencesociety.org Cognitive Science Society]
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* [http://www.ssrn.com/csn/index.html Cognitive Science Network]
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* [http://cogsci-online.ucsd.edu Cognitive Science Online]
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* [http://www.cogs.indiana.edu/iacs/programs.html List of University Departments of Cognitive Science]
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* [http://www.cogsci.rpi.edu/csjarchive/ Cognitive Science Journal Archive]: 25 years of the official ''Cognitive Science'' journal, annual conference proceedings and supplemental materials
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* [http://www.cogs.indiana.edu/iacs/ iCogSci: An online information portal of everything Cognitive Science]
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* [http://www.cognobytes.com/cogs/introduction-to-cognition Introducing Cognitive Science on CognoBytes]
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* [http://www.scaruffi.com/mind.html Piero Scaruffi's annotated bibliography on the mind]
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* [http://www.revuelabyrinthe.org/sommaire744.html A special issue of the journal ''Labyrinthe'', 2005 (in French): "La cognition"]
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* [http://www.studeren.uva.nl/ma-cogn Researchmaster Cognitive science] at the University of Amsterdam, The Netherlands
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* [http://www.semioticon.com/seo/C/cogsci.html Entry in the Semiotics Encyclopedia Online]
   
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Latest revision as of 04:27, 18 May 2010

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Brain

Rendering of human brain based on MRI data

For the journal of the same name, see Cognitive Science (journal)

Cognitive science is usually defined as the scientific study either of mind or of intelligence (e.g. Luger 1994). Practically every introduction to cognitive science also stresses that it is highly interdisciplinary; the primary components of cognitive science include cognitive psychology, cognitive neuroscience, linguistics, philosophy, and computer science, while other components include robotics, anthropology and biology.

It relies on varying scientific methodology (e.g. behavioral experimentation, computational simulations, neuro-imaging, statistical analyses), and spans many levels of analysis of the mind (from low-level learning and decision mechanisms to high-level logic and planning, from neural circuitry to modular brain organization, etc.). The term cognitive science was coined by Christopher Longuet-Higgins in his 1973 commentary on the Lighthill report, which concerned the then-current state of Artificial Intelligence research.[1] In the same decade, the journal Cognitive Science and the Cognitive Science Society were founded.[2] Cognitive science differs from cognitive psychology in that algorithms that are intended to simulate human behavior are implemented or implementable on a computer.[3][4]

History

Like most approaches to the mind, cognitive science can be traced back to philosophical questions, especially about the nature of knowledge. For instance, Plato's dialog Meno, where he investigates the source of knowledge, can be seen as a foundational text.

The modern culture of cognitive science can be traced back to the early cyberneticists in the 1930s and 1940s, such as Warren McCulloch and Walter Pitts, who sought to understand the organizing principles of the mind . McCulloch and Pitts essentially invented the neural network, but did not have the computational tools to develop it into modern form.

Another precursor was the early development of the theory of computation and the digital computer in the 1940s and 1950s. Alan Turing and John von Neumann were instrumental in these developments. The modern computer, or Von Neumann machine, would play a central role in cognitive science, both as a metaphor for the mind, and as a tool for investigation.

In 1959, Noam Chomsky published a scathing review of B. F. Skinner's book Verbal Behavior. At the time, Skinner's behaviorist paradigm dominated psychology: Most psychologists focused on functional relations between stimulus and response, without positing internal representations. Chomsky's work showed that in order to explain language, we needed a theory like his generative grammar, which not only attributed internal representations but characterized their underlying order. This hugely successful theory would inspire much later cognitive science.

In the 1970s and early 1980s, much cognitive science research focused on the possibility of artificial intelligence. Researchers such as Marvin Minsky would write computer programs in languages such as LISP to attempt to formally characterize the steps that human beings went through, for instance, in making decisions and solving problems, in the hope of better understanding human thought, and also in the hope of creating artificial minds. This approach is known as "symbolic AI".

Eventually the limits of the symbolic AI research program became apparent. For instance, it seemed to be unrealistic to comprehensively list human knowledge in a form usable by a symbolic computer program. The late 80s and 90s saw the rise of neural networks and connectionism as a research paradigm. Under this point of view, often attributed to James McClelland and David Rumelhart, the mind could be characterized as a set of complex associations, represented as a layered network. Critics argue that there are some phenomena which are better captured by symbolic models, and that connectionist models are often so complex as to have little explanatory power. But the flexibility and biological plausibility of these models made them very successful.

Today a plurality of approaches exist, from connectionism, to a focus on dynamical systems models, to attempts to reintroduce symbolic models using tools from modern computer science such as machine learning.

Principles

Levels of analysis

A central tenet of cognitive science is that a complete understanding of the mind/brain cannot be attained by studying only a single level. For example, consider the problem of remembering a phone number and recalling it later. How does this process occur? One approach would be to study behavior through direct observation. A person could be presented with a phone number, asked to recall it after some delay. Then the accuracy of the response could be measured. Another approach would be to study the firings of individual neurons while a person is trying to remember the phone number. Neither of these experiments on their own would fully explain how the process of remembering a phone number works. Even if the technology to map out every neuron in the brain in real-time were available, and it were known when each neuron was firing, it would still be impossible to know how a particular firing of neurons translates into the observed behavior. Thus an understanding of how these two levels relate to each other is needed. This can be provided by a functional level account of the process. Studying a particular phenomenon from multiple levels creates a better understanding of the processes that occur in the brain to give rise to a particular behavior. Marr[5] gave a famous description of three levels of analysis:

  1. the computational theory, specifying the goals of the computation;
  2. representation and algorithm, giving a representation of the input and output and the algorithm which transforms one into the other; and
  3. the hardware implementation, how algorithm and representation may be physically realized.

(See also the entry on functionalism.)

Interdisciplinary nature

Cognitive science is an interdisciplinary field with contributors from various fields, including psychology, neuroscience, linguistics, philosophy of mind, computer science, anthropology, sociology, and biology. Cognitive science tends to view the world outside the mind much as other sciences do. Thus it too has an objective, observer-independent existence. The field is usually seen as compatible with the physical sciences, and uses the scientific method as well as simulation or modeling, often comparing the output of models with aspects of human behavior. Still, there is much disagreement about the exact relationship between cognitive science and other fields, and the interdisciplinary nature of cognitive science is largely both unrealized and circumscribed.[How to reference and link to summary or text]

Many, but not all, who consider themselves cognitive scientists have a functionalist view of the mind—the view that mental states are classified functionally, such that any system that performs the proper function for some mental state is considered to be in that mental state. Thus, according to functionalism about the mind, even non-human systems, such as other animal species, alien life forms, or advanced computers can, in principle, have mental states. This perspective is one of the reasons the term "cognitive science" is not exactly coextensive with neuroscience, psychology, or some combination of the two.[How to reference and link to summary or text]

From the external point of view, the largest interdisciplinary context of cognitive science is systemics. It includes the socio-cognitive extension of the cognition models and theories over different social environments social systems, with the emphasis on distributed cognition and intelligence.[How to reference and link to summary or text]

Cognitive science: the term

The term "cognitive" in "cognitive science" is "used for any kind of mental operation or structure that can be studied in precise terms" (Lakoff and Johnson, 1999). This conceptualization is very broad, and should not be confused with how "cognitive" is used in some traditions of analytic philosophy, where "cognitive" has to do only with formal rules and truth conditional semantics. (Nonetheless, that interpretation would bring one close to the historically dominant school of thought within cognitive science on the nature of cognition - that it is essentially symbolic, propositional, and logical.)

The earliest entries for the word "cognitive" in the OED take it to mean roughly pertaining "to the action or process of knowing". The first entry, from 1586, shows the word was at one time used in the context of discussions of Platonic theories of knowledge. Most in cognitive science, however, presumably do not believe their field is the study of anything as certain as the knowledge sought by Plato.

Scope

Cognitive science is a large field, and covers a wide array of topics on cognition. However, it should be recognized that cognitive science is not equally concerned with every topic that might bear on the nature and operation of the mind or intelligence. Social and cultural factors, emotion, consciousness, animal cognition, comparative and evolutionary approaches are frequently de-emphasized or excluded outright, often based on key philosophical conflicts. Another important mind-related subject that the cognitive sciences tend to avoid is the existence of qualia, with discussions over this issue being sometimes limited to only mentioning qualia as a philosophically-open matter. Some within the cognitive science community, however, consider these to be vital topics, and advocate the importance of investigating them.[6]

Below are some of the main topics that cognitive science is concerned with. This is not an exhaustive list, but is meant to cover the wide range of intelligent behaviors. See List of cognitive science topics for a list of various aspects of the field.

Artificial intelligence

Main article: Artificial intelligence

"... One major contribution of AI and cognitive science to psychology has been the information processing model of human thinking in which the metaphor of brain-as-computer is taken quite literally. ." AAAI Web pages.

Artificial intelligence (AI) involves the study of cognitive phenomena in machines. One of the practical goals of AI is to implement aspects of human intelligence in computers. Computers are also widely used as a tool with which to study cognitive phenomena. Computational modeling uses simulations to study how human intelligence may be structured. [7] (See the section on computational modeling in the Research Methods section.)

There is some debate in the field as to whether the mind is best viewed as a huge array of small but individually feeble elements (i.e. neurons), or as a collection of higher-level structures such as symbols, schemas, plans, and rules. The former view uses connectionism to study the mind, whereas the latter emphasizes symbolic computations. One way to view the issue is whether it is possible to accurately simulate a human brain on a computer without accurately simulating the neurons that make up the human brain.

Attention

Main article: Attention

Attention is the selection of important information. The human mind is bombarded with millions of stimuli and it must have a way of deciding which of this information to process. Attention is sometimes seen as a spotlight, meaning one can only shine the light on a particular set of information. Experiments that support this metaphor include the dichotic listening task (Cherry, 1957) and studies of inattentional blindness (Mack and Rock, 1998). In the dichotic listening task, subjects are bombarded with two different messages, one in each ear, and told to focus on only one of the messages. At the end of the experiment, when asked about the content of the unattended message, subjects cannot report it.

Language processing

File:Cgisf-tgg.svg

A well known example of a Phrase structure tree. This is one way of representing human language that shows how different components are organized hierarchically.

Main article: Cognitive linguistics

The ability to learn and understand language is an extremely complex process. Language is acquired within the first few years of life, and all humans under normal circumstances are able to acquire language proficiently. Some of the driving research questions in studying how the brain processes language include: (1) To what extent is linguistic knowledge innate or learned?, (2) Why is it more difficult for adults to acquire a second-language than it is for infants to acquire their first-language?, and (3) How are humans able to understand novel sentences?

The study of language processing ranges from the investigation of the sound patterns of speech to the meaning of words and whole sentences. Linguistics often divides language processing into orthography, phonology and phonetics, syntactics, semantics, and pragmatics. Many aspects of language can be studied from each of these components and from their interaction.

The study of language processing in cognitive science is closely tied to the field of linguistics. Linguistics was traditionally studied as a part of the humanities, including studies of history, art and literature. In the last fifty years or so, more and more researchers have studied knowledge and use of language as a cognitive phenomenon, the main problems being how knowledge of language can be acquired and used, and what precisely it consists of. Linguists have found that, while humans form sentences in ways apparently governed by very complex systems, they are remarkably unaware of the rules that govern their own speech. Thus linguists must resort to indirect methods to determine what those rules might be. If speech is indeed governed by rules, they appear to be opaque to any conscious consideration.

One approach to cognitive issues in language is the pragmatics of language, that is, the current use of the language by a real speaker. From a pragmatic analytical perspective it is possible to show that some people who have a profession in which they categorically work with language (e.g. journalists) have a behavior which is not predictable by known theories. The pragmatic approach is also useful in the study of collective distributed decision making, particularly in broadcasted systems (for instance aviation approach control - AAP).

Learning and development

Main article: Learning

Learning and development are the processes by which we acquire knowledge and information over time. Infants are born with little or no knowledge (depending on how knowledge is defined), yet they rapidly acquire the ability to use language, walk, and recognize people and objects. Research in learning and development aims to explain the mechanisms by which these processes might take place.

A major question in the study of cognitive development is the extent to which certain abilities are innate or learned. This is often framed in terms of the nature versus nurture debate. The nativist view emphasizes that certain features are innate to an organism and are determined by its genetic endowment. The empiricist view, on the other hand, emphasizes that certain abilities are learned from the environment. Although clearly both genetic and environmental input is needed for a child to develop normally, considerable debate remains about how genetic information might guide cognitive development. In the area of language acquisition, for example, some (such as Steven Pinker[8]) have argued that specific information containing universal grammatical rules must be contained in the genes, whereas others (such as Jeffrey Elman and colleagues in Rethinking Innateness) have argued that Pinker's claims are biologically unrealistic. They argue that genes determine the architecture of a learning system, but that specific "facts" about how grammar works can only be learned as a result of experience.

Memory

Main article: Memory

Memory allows us to store information for later retrieval. Memory is often thought of consisting of both a long-term and short-term store. Long-term memory allows us to store information over prolonged periods (days, weeks, years). We do not yet know the practical limit of long-term memory capacity. Short-term memory allows us to store information over short time scales (seconds or minutes).

Memory is also often grouped into declarative and procedural forms. Declarative memory--grouped into subsets of semantic and episodic forms of memory--refers to our memory for facts and specific knowledge, specific meanings, and specific experiences (e.g., Who was the first president of the U.S.A.?, or "What did I eat for breakfast four days ago?). Procedural memory allows us to remember actions and motor sequences (e.g. how to ride a bicycle) and is often dubbed implicit knowledge or memory .

Cognitive scientists study memory just as psychologists do, but tend to focus in more on how memory bears on cognitive processes, and the interrelationship between cognition and memory. One example of this could be, what mental processes does a person go through to retrieve a long-lost memory? Or, what differentiates between the cognitive process of recognition (seeing hints of something before remembering it, or memory in context) and recall (retrieving a memory, as in "fill-in-the-blank")?

Perception and action

File:Necker cube.svg

The Necker cube, an example of an optical illusion

Main article: Perception

Perception is the ability to take in information via the senses, and process it in some way. Vision and hearing are two dominant senses that allow us to perceive the environment. Some questions in the study of visual perception, for example, include: (1) How are we able to recognize objects?, (2) Why do we perceive a continuous visual environment, even though we only see small bits of it at any one time? One tool for studying visual perception is by looking at how people process optical illusions. The image on the right of a Necker cube is an example of a bistable percept, that is, the cube can be interpreted as being oriented in two different directions.

The study of haptic (tactile), olfactory, and gustatory stimuli also fall into the domain of perception.

Action is taken to refer to the output of a system. In humans, this is accomplished through motor responses. Spatial planning and movement, speech production, and complex motor movements are all aspects of action.

Research methods

Many different methodologies are used to study cognitive science. As the field is highly interdisciplinary, research often cuts across multiple areas of study, drawing on research methods from psychology, neuroscience, computer science and systems theory.

Behavioral experiments

In order to have a description of what constitutes intelligent behavior, one must study behavior itself. This type of research is closely tied to that in cognitive psychology and psychophysics. By measuring behavioral responses to different stimuli, one can understand something about how those stimuli are processed.

  • Reaction time. The time between the presentation of a stimulus and an appropriate response can indicate differences between two cognitive processes, and can indicate some things about their nature. For example, if in a search task the reaction times vary proportionally with the number of elements, then it is evident that this cognitive process of searching involves serial instead of parallel processing.
  • Psychophysical responses. Psychophysical experiments are an old psychological technique, which has been adopted by cognitive psychology. They typically involve making judgments of some physical property, e.g. the loudness of a sound. Correlation of subjective scales between individuals can show cognitive or sensory biases as compared to actual physical measurements. Some examples include:
    • sameness judgments for colors, tones, textures, etc.
    • threshold differences for colors, tones, textures, etc.
  • Eye tracking. This methodology is used to study a variety of cognitive processes, most notably visual perception and language processing. The fixation point of the eyes is linked to an individual's focus of attention. Thus, by monitoring eye movements, we can study what information is being processed at a given time. Eye tracking allows us to study cognitive processes on extremely short time scales. Eye movements reflect online decision making during a task, and they provide us with some insight into the ways in which those decisions may be processed.

Brain imaging

Main article: Neuroimaging
Hypothalamus

Image of the human head with the brain. The arrow indicates the position of the hypothalamus.

Brain imaging involves analyzing activity within the brain while performing various cognitive tasks. This allows us to link behavior and brain function to help understand how information is processed. Different types of imaging techniques vary in their temporal (time-based) and spatial (location-based) resolution. Brain imaging is often used in cognitive neuroscience.

  • Single photon emission computed tomography and Positron emission tomography. SPECT and PET use radioactive isotopes, which are injected into the subject's bloodstream and taken up by the brain. By observing which areas of the brain take up the radioactive isotope, we can see which areas of the brain are more active than other areas. PET has similar spatial resolution to fMRI, but it has extremely poor temporal resolution.
  • Electroencephalography. EEG measures the electrical fields generated by large populations of neurons in the cortex by placing a series of electrodes on the scalp of the subject. This technique has an extremely high temporal resolution, but a relatively poor spatial resolution.
  • Functional magnetic resonance imaging. fMRI measures the relative amount of oxygenated blood flowing to different parts of the brain. More oxygenated blood in a particular region is assumed to correlate with an increase in neural activity in that part of the brain. This allows us to localize particular functions within different brain regions. fMRI has moderate spatial and temporal resolution.
  • Optical imaging. This technique uses infrared transmitters and receivers to measure the amount of light reflectance by blood near different areas of the brain. Since oxygenated and deoxygenated blood reflects light by different amounts, we can study which areas are more active (i.e., those that have more oxygenated blood). Optical imaging has moderate temporal resolution, but poor spatial resolution. It also has the advantage that it is extremely safe and can be used to study infants' brains.
  • Magnetoencephalography. MEG measures magnetic fields resulting from cortical activity. It is similar to EEG, except that it has improved spatial resolution since the magnetic fields it measures are not as blurred or attenuated by the scalp, meninges and so forth as the electrical activity measured in EEG is. MEG uses SQUID sensors to detect tiny magnetic fields.

Computational modeling

MultiLayerNeuralNetwork english

A Neural network with two layers.

Computational models require a mathematically and logically formal representation of a problem. Computer models are used in the simulation and experimental verification of different specific and general properties of intelligence. Computational modeling can help us to understand the functional organization of a particular cognitive phenomenon. There are two basic approaches to cognitive modeling. The first is focused on abstract mental functions of an intelligent mind and operates using symbols, and the second, which follows the neural and associative properties of the human brain, and is called subsymbolic.

  • Symbolic modeling evolved from the computer science paradigms using the technologies of Knowledge-based systems, as well as a philosophical perspective, see for example "Good Old-Fashioned Artificial Intelligence" (GOFAI). They are developed by the first cognitive researchers and later used in information engineering for expert systems . Since the early 1990s it was generalized in systemics for the investigation of functional human-like intelligence models, such as personoids, and, in parallel, developed as the SOAR environment. Recently, especially in the context of cognitive decision making, symbolic cognitive modeling is extended to socio-cognitive approach including social and organization cognition interrelated with a sub-symbolic not conscious layer.
  • Subsymbolic modeling includes Connectionist/neural network models. Connectionism relies on the idea that the mind/brain is composed of simple nodes and that the power of the system comes primarily from the existence and manner of connections between the simple nodes. Neural nets are textbook implementations of this approach. Some critics of this approach feel that while these models approach biological reality as a repetition of how the system works, they lack explanatory powers because complicated systems of connections with even simple rules are extremely complex and often less interpretable than the system they model.

Other approaches gaining in popularity include the use of Dynamical systems theory and also techniques putting symbolic models and connectionist models into correspondence (Neural-symbolic integration). Bayesian models, often drawn from machine learning, are also gaining popularity.

All the above approaches tend to be generalized to the form of integrated computational models of a synthetic/abstract intelligence, in order to be applied to the explanation and improvement of individual and social/organizational decision-making and reasoning.

Neurobiological methods

Research methods borrowed directly from neuroscience and neuropsychology can also help us to understand aspects of intelligence. These methods allow us to understand how intelligent behavior is implemented in a physical system.

Key findings

Cognitive science has much to its credit. Among other accomplishments, it has given rise to models of human cognitive bias and risk perception, and has been influential in the development of behavioral finance, part of economics. It has also given rise to a new theory of the philosophy of mathematics, and many theories of artificial intelligence, persuasion and coercion. It has made its presence firmly known in the philosophy of language and epistemology - a modern revival of rationalism - as well as constituting a substantial wing of modern linguistics. Fields of cognitive science have been influential in understanding the brain's particular functional systems (and functional deficits) ranging from speech production to auditory processing and visual perception. It has made progress in understanding how damage to particular areas of the brain affect cognition, and it has helped to uncover the root causes and results of specific disfunction, such as dyslexia, anopia, and hemispatial neglect.

Criticism

The philosophical underpinnings of research in cognitive science have been criticized by philosophers and scientists alike[attribution needed]. In a speech given shortly before his death[9], B.F. Skinner stated that "cognitive science is the creationism of psychology." See Functionalism (philosophy of mind) for an extended entry on criticisms.

Notable researchers

Some of the more recognized names in cognitive science are usually either the most controversial or the most cited. Within philosophy familiar names include Daniel Dennett who writes from a computational systems perspective, John Searle known for his controversial Chinese Room, Jerry Fodor who advocates functionalism, and Douglas Hofstadter, famous for writing Gödel, Escher, Bach, which questions the nature of words and thought. In the realm of linguistics, Noam Chomsky and George Lakoff have been influential (both have also become notable as political commentators). In Artificial intelligence Marvin Minsky and Kevin Warwick are prominent. Popular names in the discipline of psychology include James McClelland and Steven Pinker.

The academic field of cognitive science in its own right is very recently established. The University of California, San Diego was the first university in the world to establish a cognitive science department and the first Ph.D. in cognitive science was awarded to Agneta Gulz of Lund University in 1991.[10][11][12]

See also

http://www.wikicities.com/images/Smallwikipedialogo.png This page uses content from the English-language version of Wikiversity. The original article was at {{{1}}}. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikiversity is available under the GNU Free Documentation License.




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Notes

  1. Longuet-Higgins, H. C. (1973). "Comments on the Lighthill Report and the Sutherland Reply", in Artificial Intelligence: a paper symposium, Science Research Council, 35-37
  2. Cognitive Science Society
  3. [1]
  4. Luger, George (1994). Cognitive science : the science of intelligent systems, San Diego: Academic Press.
  5. Marr, D. (1982). Vision: A Computational Investigation into the Human Representation and Processing of Visual Information. W. H. Freeman.
  6. A number of authors consider the qualia problem to be part of the cognitive science field, e.g. Some philosophical issues in cognitive science: qualia, intentionality, and the mind-body problem, Qualia: The Hard Problem, and indeed the entire discipline of philosophy as being part of the cog sci field, e.g. What is Cognitive Science?, while other reputable sources that cover both qualia and cog sci do not draw any obvious connection between them, e.g. the Stanford encyclopedia of philosophy (Jan 2008 online edition) does have full-size articles on both qualia and cog sci, but qualia are not even mentioned in the cog sci article while cog sci is not mentioned in the qualia article.
  7. Sun, Ron (ed.) (2008). The Cambridge Handbook of Computational Psychology. Cambridge University Press, New York.
  8. Pinker S., Bloom P. (1990). Natural language and natural selection. Behavioral and Brain Sciences 13 (4): 707–784.
  9. ref.
  10. http://www.linguistlist.org/issues/19/19-2813.html
  11. http://www.cogsci.ucsd.edu/index.php?cat=about&page=overview
  12. http://www.lucs.lu.se/Agneta.Gulz/

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  1. Baumgartner, P., et al. Eds. (1995). Speaking Minds: Interviews With Twenty Eminent Cognitive Scientists. Princeton, NJ: Princeton University Press.
  2. Bechtel, W. et al. Ed. (1999). A Companion to Cognitive Science. Blackwell Companions to Philosophy. Malden, MA: Blackwell Publishers.
  3. Damasio, A. R. (1994). Descartes' Error: Emotion, Reason and the Human Brain. New York: Grosset/Putnam.
  4. Gardner, H. (1985). The Mind's New Science. New York: Basic Books.
  5. Gazzaniga, M. S. Ed. (1996). Conversations in the Cognitive Neurosciences. New York: The MIT Press.
  6. Hunt, M. (1982). The Universe Within: A New Science Explores the Human Mind. Brighton: The Harvester Press.
  7. Lakoff, G and Johnson, M. (1999). Philosophy In The Flesh. New York: Basic Books.
  8. Port, Robert F. and vanGelder, Tim (1995). Mind as Motion: Explorations in the Dynamics of Cognition. Cambridge, MA: The MIT Press. ISBN 0262161508 .
  9. Sun, Ron & L. Bookman, (eds.), Computational Architectures Integrating Neural and Symbolic Processes. Kluwer Academic Publishers, Needham, MA. 1994.
  10. Thagard, P. (2nd, 2005). Mind : Introduction to Cognitive Science. Cambridge, MA: The MIT Press.
  11. Thelen, Esther and Smith, Linda B. (1996). A Dynamic Systems Approach to the Development of Cognition and Action. Cambridge, MA: The MIT Press. ISBN 026270059X .
  12. Gardner, Howard (1987). The Minds New Science: A History of the Cognitive Revolution. New York: Basic Books.


Further reading

Education
Definitions
History
List of People
Publications & Publishers
Classic Texts
  • Chomsky, Noam (1965). Aspects of the Theory of Syntax, The MIT Press.
  • Dennett, Daniel C. (1981). Brainstorms: Philosophical Essays on Mind and Psychology, The MIT Press.
  • Glimcher, Paul W. (2003). Decision, Uncertainty, and the Brain, The MIT Press.
  • Minsky, Marvin L.; Seymour A. Papert (1969). Perceptrons: An Introduction to Computational Geometry, The MIT Press.
  • Noe, Alva (2005). Action in Perception, The MIT Press.
  • Pylyshyn, Zenon (1986). Computation and Cognition: Toward a Foundation for Cognitive Science, The MIT Press.
  • Rumelhart, David E.; James L. McClelland and the PDP Research Group (1987). Parallel Distributed Processing: Explorations in the Microstructure of Cognition, The MIT Press.
  • Searle, John (1992). The Rediscovery of the Mind, The MIT Press.
  • Wiener, Norbert (1948). Cybernetics or Control and Communication in the Animal and the Machine, The MIT Press.
General
  • Gleitman, Lila R.; Mark Liberman (Eds.) (1995). An Invitation to Cognitive Science, Vol. 1: Language, The MIT Press. ISBN 978-0262650441.
  • Hutto, Daniel D. (2008). Folk Psychological Narratives: The Sociocultural Basis of Understanding Reasons, The MIT Press.
  • Sun, Ron (2008). The Cambridge Handbook of Computational Psychology, Cambridge University Press, New York.

External links


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