Document Detail

Central and peripheral interactions in the perception of optic flow.
MedLine Citation:
PMID:  12450509     Owner:  NLM     Status:  MEDLINE    
The purpose of this work was to evaluate the effects of central and peripheral stimulation on the perception of optic flow over large spatial extents. Coherence thresholds were measured for RDKs simulating observer translation and radial motion. Experiments 1 and 3a measured sensitivity to a range of speeds for a circular central region, for several annular regions of increasing eccentricity, and for a full-field stimulus (80 degrees diameter). Results suggest that the spatial extent over which signals are integrated may vary in order to maximize the information available for perceptual representations. Experiments 2 and 3b evaluated central and peripheral interactions in a direction discrimination task, by comparing the effects of different signal strengths and directions in one of the two regions. The presence of noise dots (0% coherence) in either center or periphery led to a performance decrease from baseline measures. A similar decrease was observed when dots in the two regions moved in opposite directions. When dots in both regions moved in the same direction, a stronger peripheral signal led to facilitation of direction discrimination, whereas a stronger central signal did not. These findings suggest that central and peripheral inputs are not separable in the integration of optic flow, that they contribute equally to the percept under normal conditions (equal signal strength), and that peripheral stimulation seems important under ecologically relevant conditions such as poor visibility.
Claudine Habak; Christian Casanova; Jocelyn Faubert
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  42     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-26     Completed Date:  2003-04-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  2843-52     Citation Subset:  IM    
School of Optometry, Université de Montréal, Montreal, Canada.
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MeSH Terms
Discrimination (Psychology) / physiology
Motion Perception / physiology*
Photic Stimulation / methods
Sensory Thresholds / physiology
Visual Fields / physiology*

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