Document Detail

Areas of spatial interaction for a hyperacuity stimulus.
MedLine Citation:
PMID:  3716228     Owner:  NLM     Status:  MEDLINE    
We report that the ability to detect a small vernier offset (less than 5 sec of arc in many individuals) between two small spots of light separated by a narrow gap can be disrupted by presenting additional targets in close proximity to the vernier stimulus. A rectangular background of light, centered on the vernier stimulus, elevates offset threshold by a factor of two when the total width of the background is 3-4 min arc. Backgrounds narrower or wider than 3-4 min have less or no effect on vernier threshold. These areas of spatial interaction extend to either side of a vertically-oriented vernier stimulus, or above and below a horizontally-oriented stimulus, and their extent is dependent upon the gap size of the two-dot stimulus. The effect of the presence of the background on vernier threshold cannot be accounted for by spatial interval cues nor by changes in the visibility of the stimulus. Two alternative interpretations of the results are presented to develop a description of the underlying mechanisms which produce hyperacuity spatial interactions.
R A Williams; E A Essock
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Vision research     Volume:  26     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1986  
Date Detail:
Created Date:  1986-07-17     Completed Date:  1986-07-17     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  349-60     Citation Subset:  IM    
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MeSH Terms
Distance Perception / physiology
Form Perception / physiology*
Pattern Recognition, Visual / physiology*
Sensory Thresholds / physiology
Visual Acuity*
Grant Support

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

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