Document Detail

Chromatic assimilation: spread light or neural mechanism?
MedLine Citation:
PMID:  15695188     Owner:  NLM     Status:  MEDLINE    
Chromatic assimilation is the shift in color appearance of a test field toward the appearance of nearby light. Possible explanations of chromatic assimilation include wavelength independent spread light, wavelength-dependent chromatic aberration and neural summation. This study evaluated these explanations by measuring chromatic assimilation from a concentric-ring pattern into an equal-energy-white background, as a function of the inducing rings' width, separation, chromaticity and luminance. The measurements showed, in the s direction, that assimilation was observed with different inducing-ring widths and separations when the inducing luminance was lower or higher than the test luminance. In general, the thinner the inducing rings and the smaller their separation, the stronger the assimilation in s. In the l direction, either assimilation or contrast was observed, depending on the ring width, separation and luminance. Overall, the measured assimilation could not be accounted for by the joint contributions from wavelength-independent spread light and wavelength-dependent chromatic aberration. Spatial averaging of neural signals explained the assimilation in s reasonably well, but there were clear deviations from neural spatial averaging for the l direction.
Dingcai Cao; Steven K Shevell
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.     Date:  2004-12-08
Journal Detail:
Title:  Vision research     Volume:  45     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-02-07     Completed Date:  2005-05-03     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  1031-45     Citation Subset:  IM    
Department of Health Studies, University of Chicago, 940 East 57th Street, Chicago, IL 60637, USA.
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MeSH Terms
Color Perception / physiology*
Contrast Sensitivity / physiology
Models, Neurological
Neural Pathways / physiology*
Photic Stimulation / methods
Grant Support

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