Document Detail

Luminance and opponent-color contributions to visual detection and adaptation and to temporal and spatial integration.
MedLine Citation:
PMID:  978286     Owner:  NLM     Status:  MEDLINE    
We show how the processes of visual detection and of temporal and spatial summation may be analyzed in terms of parallel luminance (achromatic) and opponent-color systems; a test flash is detected if it exceeds the threshold of either system. The spectral sensitivity of the luminance system may be determined by a flicker method, and has a single broad peak near 555 nm; the spectral sensitivity of the opponent-color system corresponds to the color recognition threshold, and has three peaks at about 440, 530, and 600 nm (on a white background). The temporal and spatial integration of the opponent-color system are generally greater than for the luminance system; further, a white background selectively depresses the sensitivity of the luminance system relative to the opponent-color system. Thus relatively large (1 degree) and long (200 msec) spectral test flashes on a white background are detected by the opponent-color system except near 570 nm; the contribution of the luminance system becomes more prominent if the size or duration of the test flash is reduced, or if the white background is extinguished. The present analysis is discussed in relation to Stiles' model of independent eta mechanisms.
P E King-Smith; D Carden
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the Optical Society of America     Volume:  66     ISSN:  0030-3941     ISO Abbreviation:  J Opt Soc Am     Publication Date:  1976 Jul 
Date Detail:
Created Date:  1976-12-30     Completed Date:  1976-12-30     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7503097     Medline TA:  J Opt Soc Am     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  709-17     Citation Subset:  IM    
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MeSH Terms
Space Perception*
Visual Perception* / physiology

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