Wikia

Psychology Wiki

Changes: Fixational eye movement

Edit

Back to page

 
Line 1: Line 1:
 
{{BioPsy}}
 
{{BioPsy}}
  +
{{Main|Eye fixation}}
 
'''Fixational eye movements''' (also known as '''fixational instability''', '''retinal jitter''') are small, involuntary [[eye movements]] that occur during visual [[fixation]]. There are three categories of fixational eye movements: [[microsaccade]]s, [[ocular drift]]s, and [[ocular microtremor]]. Fixational eye movements were found in a number of [[species]], including [[human]]s, other [[primate]]s, [[cat]]s, [[rabbit]]s, [[turtle]]s, [[salamander]]s, [[owl]]s, etc. Although their existence has been known since the 1950s, the role and importance of fixational eye movements is still debated.
 
'''Fixational eye movements''' (also known as '''fixational instability''', '''retinal jitter''') are small, involuntary [[eye movements]] that occur during visual [[fixation]]. There are three categories of fixational eye movements: [[microsaccade]]s, [[ocular drift]]s, and [[ocular microtremor]]. Fixational eye movements were found in a number of [[species]], including [[human]]s, other [[primate]]s, [[cat]]s, [[rabbit]]s, [[turtle]]s, [[salamander]]s, [[owl]]s, etc. Although their existence has been known since the 1950s, the role and importance of fixational eye movements is still debated.
   
Line 17: Line 18:
 
* Susana Martinez-Conde, Stephen L. Macknik & David H. Hubel. [http://neuralcorrelate.com/martinez-conde_et_al_nrn_2004.pdf The role of fixational eye movements in visual perception.] ''Nature Reviews Neuroscience'' 5(3):229-240 (2004). [http://dx.doi.org/10.1038/nrn1348 doi:10.1038/nrn1348] [http://neuralcorrelate.com/martinez-conde_et_al_nrn_2004.pdf]
 
* Susana Martinez-Conde, Stephen L. Macknik & David H. Hubel. [http://neuralcorrelate.com/martinez-conde_et_al_nrn_2004.pdf The role of fixational eye movements in visual perception.] ''Nature Reviews Neuroscience'' 5(3):229-240 (2004). [http://dx.doi.org/10.1038/nrn1348 doi:10.1038/nrn1348] [http://neuralcorrelate.com/martinez-conde_et_al_nrn_2004.pdf]
   
[[Category:Eye]]
+
[[Category:Eye fixation]]
  +
[[Category:Eye movements]]
 
[[Category:Vision]]
 
[[Category:Vision]]
 
{{enWP|Fixational eye movement}}
 
{{enWP|Fixational eye movement}}

Revision as of 10:21, June 20, 2013

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

Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)


Main article: Eye fixation

Fixational eye movements (also known as fixational instability, retinal jitter) are small, involuntary eye movements that occur during visual fixation. There are three categories of fixational eye movements: microsaccades, ocular drifts, and ocular microtremor. Fixational eye movements were found in a number of species, including humans, other primates, cats, rabbits, turtles, salamanders, owls, etc. Although their existence has been known since the 1950s, the role and importance of fixational eye movements is still debated.

In the current consensus, fixational eye movements contribute to maintain visibility, by continuously stimulating neurons in the early visual areas of the brain, which mostly respond to transient stimuli. In the absence of retinal jitter (a laboratory condition called retinal stabilization), the visual percept rapidly fades out and may even completely disappear under certain conditions (low contrast, absence of sharp edges, etc.).

Experiments in neurophysiology from different laboratories have shown that fixational eye movements, particularly microsaccades, strongly modulate the activity of neurons in several visual areas of the macaque brain. This topic is currently under active investigation.

Fixational eye movements might also participate to the neural code in the early visual system, although this hypothesis is still a very recent line of research.

See also

References

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

Around Wikia's network

Random Wiki