Document Detail

Depth attraction and repulsion of disparate foveal stimuli.
MedLine Citation:
PMID:  3424683     Owner:  NLM     Status:  MEDLINE    
Interaction in the domain of disparity can be either of the kind where the depth difference between adjacent targets is enhanced, as if the two targets repelled each other in depth, or it may be in the opposite direction, i.e. having the character of attraction. In the fovea, interaction between stimuli is of the latter kind if targets are separated by less than 2-8 min of arc, dependent on their positions and the observer; for further separations, repulsion is exhibited. When disparate neighbors induce a change in depth of a visual feature, only a portion of the effect can be ascribed to monocular localization shifts in the two monocular retinal images. Both attraction and repulsion can occur between targets of opposite contrast. Depth interaction measured by a psychophysical nulling method increases monotonically with disparity in the regions clearly governed by the repulsion and the attraction regimen; in the transition region, repulsion overtakes attraction when the disparity becomes larger. If the concept of "pooling" of disparity is invoked to account for the affinity of seen depth of closely-adjacent stimuli, the signals involved cannot be simply those of light weighted by disparity, but must be associated with individual features.
G Westheimer; D M Levi
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Vision research     Volume:  27     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1987  
Date Detail:
Created Date:  1988-02-23     Completed Date:  1988-02-23     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1361-8     Citation Subset:  IM; S    
Department of Physiology-Anatomy, University of California, Berkeley 94720.
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MeSH Terms
Depth Perception / physiology*
Fovea Centralis / physiology*
Macula Lutea / physiology*
Sensory Thresholds / physiology
Grant Support

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