Document Detail

Luminance and color effects on localization of briefly flashed visual stimuli.
MedLine Citation:
PMID:  8782384     Owner:  NLM     Status:  MEDLINE    
Visual localization was studied by flashing small stimuli on a green background and requiring observers to press keys to indicate whether the stimulus appeared to the left or right of fixation. The results suggest that, for small (0.25 deg) briefly flashed (17 ms) stimuli at an eccentric location (10 deg), color contrast is not useable and localization presumably must rely on the magnocellular pathway. When stimulus size and duration were increased at 10-deg eccentricity, isochromatic stimuli could be localized at less than 10% luminance contrast (again suggesting use of the magnocellular high sensitivity luminance-contrast system), but isoluminant color-contrast stimuli could also be localized (suggesting use of the color-contrast sensitive parvocellular system). Thus, the results indicate that, dependent on stimulus conditions, both magnocellular and parvocellular pathways were utilized by normal observers in this localization task.
R E Graves
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Visual neuroscience     Volume:  13     ISSN:  0952-5238     ISO Abbreviation:  Vis. Neurosci.     Publication Date:    1996 May-Jun
Date Detail:
Created Date:  1996-12-10     Completed Date:  1996-12-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8809466     Medline TA:  Vis Neurosci     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  567-73     Citation Subset:  IM; S    
Department of Psychology, University of Victoria, B.C., Canada. rgraves@UVic.CA
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MeSH Terms
Middle Aged
Photic Stimulation / methods
Time Factors
Visual Pathways / physiology
Visual Perception / physiology*

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