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The Journal of Neurophysiology Vol. 84 No. 4 October 2000, pp. 2048-2062
Copyright ©2000 by the American Physiological Society
1The Rockefeller University, New York, New York 10021; and 2Department of Neuroscience, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
Kapadia, Mitesh K.,
Gerald Westheimer, and
Charles D. Gilbert.
Spatial Distribution of Contextual Interactions in Primary Visual
Cortex and in Visual Perception. J. Neurophysiol. 84: 2048-2062, 2000. To examine the role of
primary visual cortex in visuospatial integration, we studied the
spatial arrangement of contextual interactions in the response
properties of neurons in primary visual cortex of alert monkeys and in
human perception. We found a spatial segregation of opposing contextual
interactions. At the level of cortical neurons, excitatory interactions
were located along the ends of receptive fields, while inhibitory
interactions were strongest along the orthogonal axis. Parallel
psychophysical studies in human observers showed opposing contextual
interactions surrounding a target line with a similar spatial
distribution. The results suggest that V1 neurons can participate in
multiple perceptual processes via spatially segregated and functionally distinct components of their receptive fields.
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