Wikia

Psychology Wiki

Geon (psychology)

Talk0
34,135pages on
this wiki
Revision as of 09:06, March 10, 2007 by Dr Joe Kiff (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual differences | Personality | Philosophy | Social |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |

Cognitive Psychology: Attention · Decision making · Learning · Judgement · Memory · Motivation · Perception · Reasoning · Thinking  - Cognitive processes Cognition - Outline Index


Geons (geometric ions) are simple 3-dimensional forms such as spheres, cubes, cylinders, cones or wedges. One often-cited[1] theory of object recognition, Biederman's recognition-by-components (RBC)[2] theory, proposes that visual input is matched against structural representations of objects in the brain. These structural representations consist of geons and their interrelations (e.g., an ice cream cone could be broken down into a sphere located above a cone). Geons can be used to represent a large number of possible objects with very few components; e.g., 24 geons can be recombined to create over 10 million different two-geon objects.

Properties of GeonsEdit

There are 2 essential properties of geons:

  1. Viewpoint-invariance: they can potentially be distinguished from one another from almost any perspective (one exception being that from an end-on view, a cylinder can look like a sphere).
  2. Stability: recognition of geons is often robust to occlusion and degradation by visual noise.
Geons

Two cases of two interrelated geons, What does the reader imagine in each case?

Refute of GeonsEdit

Some more recent studies[3] suggest three-dimensional object recognition is viewpoint dependent, rather than independent, in refute of recognition-by-components theory and geons. This refute follows in part from the observation that different regions of the brain respond to different viewpoints of a common object, say, the human face. Since each region responds differently to different viewpoints of the same human face, the brain must not use a common underlying geon-based schema for image recognition, instead relying on a viewpoint-dependent encoding schema where matches are determined by similarity.

NotesEdit

  1. Kirkpatrick, K. Object Recognition. Department of Psychology, University of York. [1]
  2. Biederman, I. (1987) Recognition-by-components: a theory of human image understanding. Psychol Rev. 1987 Apr;94(2):115-47. [2]
  3. Tarr, M. J.; Williams, P.; Hayward, W. G.; Gauthier, I. (1998) Three-dimensional object recognition is viewpoint dependent. Nature Neuroscience. [3]

es:geón

This page uses Creative Commons Licensed content from Wikipedia (view authors).

Around Wikia's network

Random Wiki