Document Detail


Nonlinearity in color space measured by apparent motion.
MedLine Citation:
PMID:  11019615     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We used an apparent motion technique to examine the intensity coding along the three cardinal axes of color space: achromatic (L + M + S), L-M cone, and S cone axes. Two horizontal bars of different colors were alternated to produce a vertical displacement. The color of the background was a mixture varied between the colors of the two bars. When the background color was close to either of the test colors, only the bar that was more salient appeared to jump. Observers adjusted the color of the background until they saw either the two bars moved equally frequently or both bars moved at once. If the color difference in a linear cone excitation space controls this apparent motion, the setting should be midway between the two colors. All of the three cardinal axes showed some deviation from linear behavior. The nonlinearity was less extreme than a logarithmic function for both the achromatic and S cone axes and could be attributed to a small compressive nonlinearity, possibly at the level of cone responses. However, the L-M stimuli showed a more extreme departure from linearity, which suggested a nonlinearity at an opponent site. A test of perceived contrast judgments did not show this nonlinearity for L-M axis, suggesting that it is specific to the L-M contribution to apparent motion.
Authors:
S Shioiri; P Cavanagh
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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.    
Journal Detail:
Title:  Perception & psychophysics     Volume:  62     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  2000 Aug 
Date Detail:
Created Date:  2000-10-24     Completed Date:  2000-10-24     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1182-90     Citation Subset:  IM    
Affiliation:
Department of Information and Image Sciences, Chiba University, Japan. shiori@image.tp.chiba-u.ac.jp
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MeSH Terms
Descriptor/Qualifier:
Color Perception / physiology*
Humans
Motion Perception / physiology*
Nonlinear Dynamics*
Space Perception / physiology*
Grant Support
ID/Acronym/Agency:
EY09258/EY/NEI NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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