Document Detail

On the role of X and simple cells in human contrast processing.
MedLine Citation:
PMID:  8160384     Owner:  NLM     Status:  MEDLINE    
We investigated the potential role of retinal X and cortical simple cells in determining human psychophysical detection performance under contrast masking conditions. Since both X and simple cells exhibit a null phase, the phase of a background mask should affect the visibility of a test grating processed by such cells. Sinusoidal test gratings of either 1 or 7 c/deg were presented as a sustained or transient increment against a background mask of the same size and spatial frequency at either 0 or 90 deg phase. For background contrasts from 0.5% up to 40%, psychophysical contrast sensitivity was phase-independent for all conditions. Therefore, either (1) contrast threshold is mediated by cells with non-linear spatial summation properties, such as Y or complex cells, or (2) the masking effect of the background occurs after a phase-insensitive combination or pooling of simple cell responses in the cortex.
T B Lawton; C W Tyler
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Vision research     Volume:  34     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1994 Mar 
Date Detail:
Created Date:  1994-05-18     Completed Date:  1994-05-18     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  659-67     Citation Subset:  IM    
Nano Tech Services, Channel Islands Harbor, CA 93035.
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MeSH Terms
Contrast Sensitivity / physiology*
Discrimination (Psychology) / physiology
Pattern Recognition, Visual / physiology
Perceptual Masking / physiology
Retina / physiology*
Sensory Thresholds / physiology
Visual Cortex / physiology*
Grant Support

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