Document Detail

A nonlinear chromatic motion mechanism.
MedLine Citation:
PMID:  9536355     Owner:  NLM     Status:  MEDLINE    
Previous research has demonstrated two categorically distinct mechanisms mediating apparent motion of kinematograms composed of eccentricity-confined, randomly placed Gabor micropatterns: a quasi-linear mechanism operating for high micropattern densities and short time separations, and a nonlinear mechanism operating at low micropattern densities or longer time separations. Here we compare the performance of these two mechanisms using color (isoluminant) and luminance-defined stimuli. When these stimuli are defined only by their color contrast, the response of the quasi-linear mechanism is severely impaired, while the nonlinear mechanism remains fully operative. This result further strengthens the dichotomy between the two kinds of motion perception, and suggests that when color vision supports motion perception it does so primarily, or perhaps entirely, via a nonlinear mechanism.
C L Baker; J C Boulton; K T Mullen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  38     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1998 Jan 
Date Detail:
Created Date:  1998-04-15     Completed Date:  1998-04-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  291-302     Citation Subset:  IM    
McGill Vision Research Unit, Department of Ophthalmology, McGill University, Montreal, Quebec, Canada.
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MeSH Terms
Color Perception / physiology*
Contrast Sensitivity / physiology
Discrimination (Psychology) / physiology
Motion Perception / physiology*
Pattern Recognition, Visual / physiology
Sensory Thresholds / physiology

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