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| Research article summary (published 4 May 2009): |
Central V4 receptive fields are scaled by the V1 cortical magnification and correspond to a constant-sized sampling of the V1 surface.
Full Abstract
The mapping of the topographic representation of the visual field onto cortical areas changes throughout the hierarchy of cortical visual areas. The changes are believed to reflect the establishment of modules with different spatial processing emphasis. The receptive fields (RFs) of neurons within these modules, however, may not be governed by the same spatial topographic map parameters. Here it is shown that the RFs of area V4 neurons (centered 1-12 degrees in eccentricity) are based on a circularly symmetric sampling of the primary visual cortical retinotopic map. No eccentricity dependent magnification beyond that observed in V1 is apparent in the V4 neurons. The size and shape of V4 RFs can be explained by a simple, constant sized, two-dimensional Gaussian sample of visual input from the retinotopic map laid out across the surface of V1. Inferences about the spatial scale of interactions within the receptive fields of neurons cannot be based on a visual area's apparent cortical magnification derived from topographic mapping.
Author information
Author/s: Motter, Brad C (BC);
Affiliation: Veterans Affairs Medical Center, Syracuse, New York 13210, USA. motterb(-atsign-)cnyrc.org
Grants: R01 EY018693-01A1 (Agency:NEI NIH HHS) ; R01-EY018693 (Agency:NEI NIH HHS)
Journal and publication information
Publication Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.
Journal: The Journal of neuroscience : the official journal of the Society for Neuroscience (J Neurosci), published in United States. (Language: eng)
Reference: 2009-May; vol 29 (issue 18) : pp 5749-57
Dates: Created 2009/05/07; Completed 2009/05/28; Revised 2009/11/09;
PMID: 19420243, status: MEDLINE (last retrieval date: 11/10/2009, IMS Date: 11 Jun 2009 00:00:00)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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