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. 1976 Apr;256(3):509–526. doi: 10.1113/jphysiol.1976.sp011336

Binocular visual mechanisms in cortical areas I and II of the sheep.

P G Clarke, I M Donaldson, D Whitteridge
PMCID: PMC1309322  PMID: 1271290

Abstract

1. Units were recorded in the primary and secondary visual areas (V1 and V2) of the sheep. They were stimulated binocularly, using an adjustable prism to vary the disparity. 2. Cells in V1 responded optimally to stimuli with very small or zero disparities, but cells in V2 frequently preferred disparities of several degrees crossed or uncrossed. Many cells in V2 were particularly selective to disparity, often giving no response to a monocular stimulus. 3. Cells preferring the same disparity occur in discrete columns, about 400 muM wide. Changes between columns result from a step displacement of the receptive field of one eye. The disparities encoded in successive columns seem to follow a regular sequence: crossed, zero, uncrossed, zero, etc. 4. In both V1 and V2, cells are clustered, perhaps in columns, according to their orientation preference and ocular dominance. In V2, the constant disparity columns appear to be independent of the orientation clusters.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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