Document Detail

Blue-yellow signals are enhanced by spatiotemporal luminance contrast in macaque V1.
MedLine Citation:
PMID:  15496484     Owner:  NLM     Status:  MEDLINE    
We measured the color tuning of a population of S-cone-driven V1 neurons in awake, fixating monkeys. Analysis of randomly chosen color stimuli that were effective in evoking action potentials showed that these neurons received opposite sign input from the S cones and a combination of L and M cones. Surprisingly, these cells also responded to LM cone contrast irrespective of polarity, a nonlinear sensitivity that was masked by conventional linear analysis methods. Taken together, these observations can be summarized in a nonlinear model that combines nonopponent and opponent signals such that luminance contrast enhances color processing. These findings indicate that important aspects of the cortical representation of color cannot be described by classical linear analysis, and reveal a possible neural correlate of perceptual color-luminance interactions.
Gregory D Horwitz; E J Chichilnisky; Thomas D Albright
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-10-20
Journal Detail:
Title:  Journal of neurophysiology     Volume:  93     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-03-18     Completed Date:  2005-04-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2263-78     Citation Subset:  IM    
Vision Center Laboratory, Howard Hughes Medical Institute, The Salk Institute for Biological Studies, 10010 N. Torrey Pines Rd., La Jolla, CA 92037, USA.
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MeSH Terms
Action Potentials / physiology
Contrast Sensitivity / physiology*
Macaca mulatta
Photic Stimulation / methods*
Signal Transduction / physiology*
Space Perception / physiology
Time Factors

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