Document Detail

How vernier acuity depends on contrast.
MedLine Citation:
PMID:  2387359     Owner:  NLM     Status:  MEDLINE    
Vernier acuity was measured by finding the just discriminable offset for an edge separating fields of different luminances. The contrast of this stimulus is easily specified by the formula c = (Lstim - Lsur)(Lstim + Lsur). Vernier thresholds are about 4-5 sec of arc for contrasts 0.22 and higher, but increase exponetially with decreasing contrast. By comparison, the presence of the stimulus could be detected at a contrast of 0.016. The possible role of the magnocellular and parvocellular pathways in carrying the input signals to the fine localization process is discussed.
C Wehrhahn; G Westheimer
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Experimental brain research     Volume:  80     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  1990  
Date Detail:
Created Date:  1990-09-24     Completed Date:  1990-09-24     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  618-20     Citation Subset:  IM    
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MeSH Terms
Form Perception / physiology*
Pattern Recognition, Visual / physiology*
Visual Acuity / physiology*
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