Document Detail

Adaptive orthogonalization of opponent-color signals.
MedLine Citation:
PMID:  8274540     Owner:  NLM     Status:  MEDLINE    
This paper concerns the processing of the outputs of the two opponent-color mechanisms in the human visual system. We present experimental evidence that opponent-color signals interact after joint modulation even though they are essentially independent under neutral steady adaptation and after exclusive modulation of each mechanism. In addition, prolonged modulation linearizes the response function of each mechanism. The changes in interaction serve to orthogonalize opponent signals with respect to the adapting modulation, and the changes in response functions serve to equalize the relative frequencies of different levels of response to the adapting modulation. Adaptive orthogonalization reduces sensitivity to the adapting color direction, improves sensitivity to the orthogonal direction, and predicts shifts in color appearance. Response equalization enhances effective contrast and explains the difference between the effects of adaptation to uniform versus temporally or spatially modulated stimuli.
Q Zaidi; A G Shapiro
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Biological cybernetics     Volume:  69     ISSN:  0340-1200     ISO Abbreviation:  Biol Cybern     Publication Date:  1993  
Date Detail:
Created Date:  1994-02-08     Completed Date:  1994-02-08     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7502533     Medline TA:  Biol Cybern     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  415-28     Citation Subset:  IM    
Department of Psychology, Columbia University, New York, NY 10027.
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MeSH Terms
Adaptation, Ocular
Color Perception / physiology*
Models, Neurological*
Models, Psychological
Grant Support

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