Document Detail

Perceptual distortions in the neural representation of visual space.
MedLine Citation:
PMID:  10204765     Owner:  NLM     Status:  MEDLINE    
The visual mechanism by which human observers determine the separation between objects has long been of interest. This study examines the extent to which separation in visual space can be misperceived in foveal and extrafoveal vision. Foveally, vertical separations were consistently overestimated relative to horizontal separations, a result which is consistent with the well-documented horizontal-vertical illusion (HVI). Extrafoveally, much larger misrepresentations of visual space were perceived. In addition, separations tangential to fixation were consistently perceived as being greater than separations in a radial direction. These marked misperceptions of visual space which occur in extrafoveal vision take the form of a radial/tangential anisotropy combined with an overestimation of vertical distance. The results have important implications for meridional anisotropies which have previously been documented in a number of visual performance tasks.
P V McGraw; D Whitaker
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Experimental brain research     Volume:  125     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  1999 Mar 
Date Detail:
Created Date:  1999-06-03     Completed Date:  1999-06-03     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  122-8     Citation Subset:  IM; S    
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MeSH Terms
Fovea Centralis / physiopathology
Perceptual Disorders / physiopathology*
Space Perception / physiology*
Visual Pathways / physiopathology*
Grant Support
//Wellcome Trust

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