Document Detail

Responses to second-order texture modulations undergo surround suppression.
MedLine Citation:
PMID:  22811987     Owner:  NLM     Status:  MEDLINE    
First-order (contrast) surround suppression has been well characterized both psychophysically and physiologically,but relatively little is known as to whether the perception of second-order visual stimuli exhibits analogous center–surround interactions. Second-order surround suppression was characterized by requiring subjects to detect second-order modulation in stimuli presented alone or embedded in a surround.Both contrast- (CM) and orientation-modulated (OM) stimuli were used. For most subjects and both OM and CM stimuli, second-order surrounds caused thresholds to be higher, indicative of second-order suppression. For CM stimuli, suppression was orientation-specific, i.e., higher thresholds for parallel than for orthogonal surrounds. However, the evidence for orientation specificity of suppression for OM stimuli was weaker. These results suggest that normalization, leading to surround suppression, operates at multiple stages in cortical processing.
Helena X Wang; David J Heeger; Michael S Landy
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Vision research     Volume:  62     ISSN:  1878-5646     ISO Abbreviation:  Vision Res.     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-07-18     Completed Date:  2012-08-02     Revised Date:  2014-09-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  192-200     Citation Subset:  IM    
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MeSH Terms
Contrast Sensitivity / physiology
Middle Aged
Pattern Recognition, Visual / physiology*
Photic Stimulation / methods
Sensory Thresholds / physiology
Grant Support
EY16165/EY/NEI NIH HHS; R01 EY008266/EY/NEI NIH HHS; R01 EY016165/EY/NEI NIH HHS; R01 EY016165-04/EY/NEI NIH HHS

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