Document Detail


Contrast sensitivity of the motion system.
MedLine Citation:
PMID:  8917804     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A number of experiments were conducted to investigate how global-motion performance varies with luminance contrast. When all the dots in the stimulus were the same contrast, performance improved with increasing contrast up to about the 15% level (Experiment 1). Increasing the contrast beyond this level had no additional effect on performance. When the contrast of a subgroup of the dots was varied, differential effects on performance could be obtained for contrasts up to the 80% level (Experiment 2). These results are interpreted as indicating that the performance saturation observed in Experiment 1 was due to the attainment of a performance ceiling at the global-motion level, and not due to contrast-response saturation of the underlying local-motion detectors. The results of earlier studies that have apparently found conflicting results (saturation vs no saturation) are discussed in light of the present results.
Authors:
M Edwards; D R Badcock; S Nishida
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  36     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1996 Aug 
Date Detail:
Created Date:  1996-12-11     Completed Date:  1996-12-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  2411-21     Citation Subset:  IM; S    
Affiliation:
University of California, School of Optometry, Berkeley 94720, USA.
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MeSH Terms
Descriptor/Qualifier:
Contrast Sensitivity / physiology*
Humans
Light
Male
Mathematics
Models, Neurological
Motion Perception / physiology*
Psychophysics
Sensory Thresholds / physiology

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


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