Document Detail

The spatial frequency discrimination function at low contrasts.
MedLine Citation:
PMID:  3940044     Owner:  NLM     Status:  MEDLINE    
Spatial frequency difference thresholds for sinewave gratings near contrast threshold were measured using a two-alternative forced-choice technique, and the threshold frequency differences were plotted as a proportion of standard frequency for standards from 2 to 7 cycles/degree. This function shows reliable local maxima and minima, and these features are more pronounced than they are when stimuli of 30% contrast are used. This result is consistent with the notion that at low contrasts, fewer spatial frequency channels are above threshold in the area of the visual field covered by the stimulus than when the stimulus is at high contrast.
M Woodward; E R Ettinger; D Yager
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Spatial vision     Volume:  1     ISSN:  0169-1015     ISO Abbreviation:  Spat Vis     Publication Date:  1985  
Date Detail:
Created Date:  1991-02-01     Completed Date:  1991-02-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8602662     Medline TA:  Spat Vis     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  13-7     Citation Subset:  IM; S    
Schnurmacher Institute for Vision Research, SUNY College of Optometry, NY 10010.
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MeSH Terms
Contrast Sensitivity / physiology*
Sensory Thresholds
Space Perception / physiology*

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

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