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The Journal of Neuroscience, May 6, 2009, 29(18):5749-5757; doi:10.1523/JNEUROSCI.4496-08.2009

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Behavioral/Systems/Cognitive
Central V4 Receptive Fields Are Scaled by the V1 Cortical Magnification and Correspond to a Constant-Sized Sampling of the V1 Surface

Brad C. Motter

Veterans Affairs Medical Center, Syracuse, New York 13210, and Department of Neuroscience and Physiology, State University of New York Upstate Medical University, Syracuse, New York 13210

Correspondence should be addressed to Brad C. Motter, Research Service 151, VA Medical Center, 800 Irving Avenue, Syracuse, NY 13210. Email: motterb{at}cnyrc.org

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° 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.

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Received Sept. 18, 2008; revised Feb. 10, 2009; accepted March 26, 2009.

Correspondence should be addressed to Brad C. Motter, Research Service 151, VA Medical Center, 800 Irving Avenue, Syracuse, NY 13210. Email: motterb{at}cnyrc.org

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