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| Research article summary (published 29 Nov 2002): |
Top-down influence in early visual processing: a Bayesian perspective.
Full Abstract
Traditional views of visual processing suggest that early visual neurons are static spatiotemporal filters that extract local features by feedforward computation. The extracted information is then fed forward through a chain of modules to successively higher visual areas for further analysis. Recording from early visual neurons in awake behaving monkeys, we revealed there are many levels of complexity in the information processing of the early visual cortex. We found that the early visual neurons not only are sensitive to features within their receptive fields (RFs) but also to the global context of a visual scene, the behavioral relevance of the stimuli and the experience of the animals. These findings suggest that the early visual cortex (V1 and V2) is tightly coupled to and highly interactive with the rest of the visual system. The top-down interaction, mediated by recurrent feedback connections, introduces contextual information to influence the perceptual inference in the early visual cortex.
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Author information
Author/s: Lee, Tai Sing (TS);
Affiliation: Center for the Neural Basis of Cognition and Computer Science Department, Carnegie Mellon University, 15213, Pittsburgh, PA, USA. tai(-atsign-)cnbc.cmu.edu
Grants: 2P41RR06009-11 (Agency:United States NCRR) ; EY0808 (Agency:United States NEI)
Journal and publication information
Publication Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.; Review
Journal: Physiology & behavior (Physiol Behav), published in United States. (Language: eng)
Reference: 2002-Dec; vol 77 (issue 4-5) : pp 645-50
Dates: Created 2003/01/15; Completed 2003/07/11; Revised 2007/11/14;
PMID: 12527013, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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