Document Detail

Color spaces of color-normal and color-abnormal observers reconstructed from response times and dissimilarity ratings.
MedLine Citation:
PMID:  10598477     Owner:  NLM     Status:  MEDLINE    
With multidimensional scaling analysis, color spaces were reconstructed from reaction times (RTs) required to make same-different judgements of pairs of 15 equiluminant colors and from dissimilarity ratings between them. In addition to normal trichromats, observers with red-green color deficiency were tested. Two main purposes were served by this study: (1) to compare spatial representations of colors derived from discriminative RTs with those derived from dissimilarity measures and (2) to examine whether the task may selectively affect the dimension reflecting, in color-abnormal spaces, the deficient red-green mechanism. Contradicting our hypothesis of lower dimensionality of RT spaces, as compared with rating spaces, no consistent differences in solution dimensionality were found. However, configurations derived from the two measures diverged. The rating procedure yielded the most logical results for recovering color space. The RT configuration revealed contraction in the tritanopic direction, indicating longer color processing when the short-wavelength mechanism is involved, and in addition, for color-abnormal observers, clustering in the protanopic and deuteranopic directions, indicating even longer processing by the deficient red-green mechanism. This finding implies that RTs are suitable for detecting temporal differences in color processing but, for that very same reason, rather ill-suited for reconstructing color spaces.
G V Paramei; C R Cavonius
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Perception & psychophysics     Volume:  61     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  1999 Nov 
Date Detail:
Created Date:  2000-02-02     Completed Date:  2000-02-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1662-74     Citation Subset:  IM    
Universität Dortmund, Germany.
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MeSH Terms
Color Perception*
Color Perception Tests
Color Vision Defects / diagnosis,  genetics,  psychology*
Discrimination Learning*
Reaction Time*

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

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