Document Detail


Saturation and purity of near-threshold spectral increments on achromatic backgrounds.
MedLine Citation:
PMID:  2216325     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Vector models of color vision predict that the chromatic saturation of near-threshold incremental stimuli should grow with increasing achromatic adaptation. In contrast, colorimetric models predict that saturation should decrease with increasing adaptation in correspondence with excitation purity. An experimental test disagrees with both predictions, but is consistent with a two-process model of chromatic adaptation and contrast. Foveal monochromatic test stimuli 0.6 log unit above threshold were superposed on achromatic backgrounds with retinal illuminances of up to 5.3 log Td. Saturation and purity both decreased as background illuminance increased up to 2 log Td, but the saturation decrease was relatively small. As background illuminance increased above 2 log Td, purity remained nearly constant and saturation often increased, making the overall saturation function U-shaped. Thus, a purity of 0.1 at high background illuminance could sometimes elicit a higher saturation estimate than a purity of 0.9 at low background illuminance.
Authors:
B Drum
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Optometry and vision science : official publication of the American Academy of Optometry     Volume:  67     ISSN:  1040-5488     ISO Abbreviation:  Optom Vis Sci     Publication Date:  1990 Aug 
Date Detail:
Created Date:  1990-11-21     Completed Date:  1990-11-21     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8904931     Medline TA:  Optom Vis Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  595-9     Citation Subset:  IM    
Affiliation:
Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland.
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Ocular
Adult
Color Perception / physiology*
Humans
Light
Models, Biological
Psychophysics
Grant Support
ID/Acronym/Agency:
EY05871/EY/NEI NIH HHS

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


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