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Depth is encoded in the visual cortex by a specialized receptive field structure

Nature volume 352, pages 156–159 (1991)Cite this article

Abstract

BINOCULAR neurons in the visual cortex are thought to perform the first stage of processing for the fine stereoscopic depth discrimination exhibited by animals with frontally located eyes. Because lateral separation of the eyes gives a slightly different view to each eye, there are small variations in position (disparities), mainly along the horizontal dimension, between corresponding features in the two retinal images. The visual system uses these disparities to gauge depth. We studied neurons in the cat's visual cortex to determine whether the visual system uses the anisotropy in the range of horizontal and vertical disparities. We report here that there is a corresponding anisotropy in the cortical representation of binocular information: receptive-field profiles for left and right eyes are matched for cells that are tuned to horizontal orientations of image contours. For neurons tuned to vertical orientations, left and right receptive fields are predominantly dissimilar. Therefore, a major modification is required of the conventional notion of disparity processing. The modified scheme allows a unified encoding of monocular form and binocular disparity information.

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Author notes

  1. Ralph D. Freeman: To whom correspondence should be addressed.

Authors and Affiliations

  1. Bioengineering and Neurobiology Groups, School of Optometry, University of California, Berkeley, California, 94720, USA

    Gregory C. DeAngelis, Izumi Ohzawa & Ralph D. Freeman

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  1. Gregory C. DeAngelis
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  2. Izumi Ohzawa
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  3. Ralph D. Freeman
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DeAngelis, G., Ohzawa, I. & Freeman, R. Depth is encoded in the visual cortex by a specialized receptive field structure. Nature 352, 156–159 (1991). https://doi.org/10.1038/352156a0

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