| An architectural hypothesis for direction selectivity in the visual cortex: the role of spatially asymmetric intracortical inhibition. | |
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MedLine Citation:
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PMID: 10192900 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Within a linear field approach, an architectural model for simple cell direction selectivity in the visual cortex is proposed. The origin of direction selectivity is related to recurrent intracortical interactions with a spatially asymmetric character along the axis of stimulus motion. No explicit asymmetric temporal mechanisms are introduced or adopted. The analytical investigation of network behavior, carried out under the assumption of a linear superposition of geniculate and intracortical contributions, shows that motion sensitivity of the resulting receptive fields emerges as a dynamic property of the cortical network without any feed-forward direction selectivity bias. A detailed analysis of the effects of the architectural characteristics of the cortical network on directionality and velocity-response curves was conducted by systematically varying the model's parameters. |
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Authors:
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S P Sabatini; F Solari |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Biological cybernetics Volume: 80 ISSN: 0340-1200 ISO Abbreviation: Biol Cybern Publication Date: 1999 Mar |
Date Detail:
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Created Date: 1999-05-03 Completed Date: 1999-05-03 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7502533 Medline TA: Biol Cybern Country: GERMANY |
Other Details:
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Languages: eng Pagination: 171-83 Citation Subset: IM |
Affiliation:
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Department of Biophysical and Electronic Engineering, University of Genoa, Italy. silvio@dibe.unige.it |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cybernetics Models, Neurological* Motion Perception / physiology Nerve Net / physiology Visual Cortex / anatomy & histology, physiology* Visual Fields / physiology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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