Document Detail

Visual mechanisms that signal the direction of color changes.
MedLine Citation:
PMID:  8506644     Owner:  NLM     Status:  MEDLINE    
Evidence is presented for a visual capacity specialized to sense the chromatic direction of change in colors over time. Discrimination thresholds were measured between pairs of suprathreshold color changes presented in consecutive intervals. In one interval, the color of a spatially uniform disk was changed at a constant speed along the circumference of a circle in an equiluminant color plane. In the other, an instantaneous change, which can be described as a vector in the equiluminant plane, was added to the circular color modulation. Averaging across conditions showed that the threshold for discriminating between a pair of purely temporal color changes was approximately proportional to the cosine of the color angle between them. The model that is presented to account for these results is based on parallel directional-color mechanisms that are tuned to different directions in color-space and are responsive to change in one color direction but not its opposite.
Q Zaidi; D Halevy
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Vision research     Volume:  33     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1993 May 
Date Detail:
Created Date:  1993-07-08     Completed Date:  1993-07-08     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1037-51     Citation Subset:  IM    
Department of Psychology, Columbia University, New York, NY 10027.
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MeSH Terms
Color Perception / physiology*
Discrimination (Psychology) / physiology
Models, Neurological
Sensory Thresholds / physiology
Time Factors
Grant Support

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