Adaptive orthogonalization of opponent-color signals

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 exclu...

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Bibliographic Details
Published in:Biological cybernetics 1993, Vol.69 (5-6), p.415-428
Main Authors: ZAIDI, Q, SHAPIRO, A. G
Format: Article
Language:English
Subjects:
Adaptation, Ocular
Biological and medical sciences
Color Perception - physiology
Fundamental and applied biological sciences. Psychology
Humans
Learning
Mathematics
Memory
Models, Neurological
Models, Psychological
Perception
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Vision
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Summary: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.
ISSN:0340-1200
1432-0770
DOI:10.1007/BF01185413