Document Detail

Target recovery in metacontrast: the effect of contrast.
MedLine Citation:
PMID:  17081585     Owner:  NLM     Status:  MEDLINE    
The visibility of a target stimulus (T) can be reduced by an aftercoming and spatially non-overlapping mask stimulus (M1), a phenomenon known as metacontrast masking. Interestingly, the visibility of the masked target can be recovered when a secondary mask (M2) is added to the T-M1 sequence. We analyzed a computational model of retino-cortical dynamics (RECOD) and derived the prediction that contrast dependence of metacontrast and target recovery should parallel the contrast dependence of afferent magnocellular and parvocellular pathways, respectively. In a psychophysical experiment, we tested this prediction by systematically varying (a) M2's contrast and (b) the M1-M2 onset asynchrony (SOA). At the optimal M1-M2 SOA, target recovery effect increased with M2's contrast without saturating, but at the optimal M1-M2 metacontrast SOA, reduction of M1's visibility saturated very rapidly as M2's contrast increased. Quantitative comparisons of psychophysical results with model simulations provide support for our prediction. We conclude that metacontrast masking is driven by signals originating from the magnocellular pathway and target recovery in metacontrast is driven by signals originating from the parvocellular pathway.
Haluk Oğmen; Bruno G Breitmeyer; Steven Todd; Lynn Mardon
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2006-11-01
Journal Detail:
Title:  Vision research     Volume:  46     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2006 Dec 
Date Detail:
Created Date:  2006-11-20     Completed Date:  2007-03-29     Revised Date:  2013-06-07    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  4726-34     Citation Subset:  IM    
Department of Electrical & Computer Engineering, N308 Engineering Building 1, University of Houston, Houston TX 77204-4005, USA.
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MeSH Terms
Computer Simulation
Contrast Sensitivity / physiology
Middle Aged
Models, Neurological
Neural Inhibition / physiology
Perceptual Masking / physiology*
Retina / physiology
Visual Cortex / physiology
Visual Pathways / physiology
Visual Perception / physiology*
Grant Support
R01 MH049892-10/MH/NIMH NIH HHS; R01-MH49892/MH/NIMH NIH HHS

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

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