Document Detail

Contour saliency in primary visual cortex.
MedLine Citation:
PMID:  16772175     Owner:  NLM     Status:  MEDLINE    
Contour integration is an important intermediate stage of object recognition, in which line segments belonging to an object boundary are perceptually linked and segmented from complex backgrounds. Contextual influences observed in primary visual cortex (V1) suggest the involvement of V1 in contour integration. Here, we provide direct evidence that, in monkeys performing a contour detection task, there was a close correlation between the responses of V1 neurons and the perceptual saliency of contours. Receiver operating characteristic analysis showed that single neuronal responses encode the presence or absence of a contour as reliably as the animal's behavioral responses. We also show that the same visual contours elicited significantly weaker neuronal responses when they were not detected in the detection task, or when they were unattended. Our results demonstrate that contextual interactions in V1 play a pivotal role in contour integration and saliency.
Wu Li; Valentin Piëch; Charles D Gilbert
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Neuron     Volume:  50     ISSN:  0896-6273     ISO Abbreviation:  Neuron     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-06-14     Completed Date:  2006-07-25     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8809320     Medline TA:  Neuron     Country:  United States    
Other Details:
Languages:  eng     Pagination:  951-62     Citation Subset:  IM    
The Rockefeller University, 1230 York Avenue, New York, New York 10021, USA.
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MeSH Terms
Action Potentials / physiology
Form Perception / physiology*
Macaca mulatta
Photic Stimulation / methods
Visual Cortex / physiology*
Grant Support

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