Document Detail

Temporal mechanisms underlying flicker detection and identification for red-green and achromatic stimuli.
MedLine Citation:
PMID:  8828199     Owner:  NLM     Status:  MEDLINE    
We have simultaneously measured detection and temporal frequency identification for both red-green isoluminant and achromatic stimuli over a range of temporal frequencies for two observers. Results show that temporal frequency identification can be made along the temporal frequency dimension for both red-green and achromatic stimuli at contrasts close to detection threshold. In general, temporal frequency identification was better for the achromatic than for the red-green stimuli; however, the level of chromatic identification performance was still sufficient to permit us to reject the notion that the red-green mechanism embodies a single temporal filter. We have developed a model based on signal detection theory that assumes that detection and identification both depend on the properties of the temporal filters underlying each mechanism. From this we have derived putative underlying shapes and sensitivities for the temporal filters of the red-green and achromatic mechanisms that comprise a low-pass and a bandpass filter for red-green color vision and two bandpass filters for luminance vision. Finally, we suggest that the relative perceived slowing of isoluminant stimuli may be accounted for by a common motion analysis subserved by different front-end temporal filters for red-green and achromatic motion signals.
A B Metha; K T Mullen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the Optical Society of America. A, Optics, image science, and vision     Volume:  13     ISSN:  1084-7529     ISO Abbreviation:  J Opt Soc Am A Opt Image Sci Vis     Publication Date:  1996 Oct 
Date Detail:
Created Date:  1996-12-09     Completed Date:  1996-12-09     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9800943     Medline TA:  J Opt Soc Am A Opt Image Sci Vis     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1969-80     Citation Subset:  IM    
McGill Vision Research, Department of Ophthalmology (H4-14), McGill University, Montreal, Quebec, Canada.
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MeSH Terms
Color Perception / physiology*
Differential Threshold
Models, Biological
Photic Stimulation
Time Factors
Vision, Ocular / physiology*

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

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