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Updated: Sep 23, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
Published on: August 1, 2018
Sensitivity to horizontal and vertical disparity and orientation preference in areas V1 and V2 of the monkey
Francisco Gonzalez1, Maria S Justo, Maria A Bermudez
1Department of Physiology, Laboratorios Ramón Dominguez, School of Medicine, Universidad de Santiago de Compostela, E-15782 Santiago de Compostela, Spain. francisco.gonzalez@usc.es
Abstract:
It has been suggested that cells are most sensitive to disparities along the axis orthogonal to their orientation preference. To test this assumption we studied the orientation preference of 73 cells sensitive to retinal disparity, 44 from V1 and 29 from V2. Orientation preference and disparity sensitivity were not related in tuned excitatory and tuned inhibitory cells. We found 18 near/far cells with orientation preference. Of these, 10 (56%) had a preferred orientation less than 30% away from the orthogonal to the disparity axis whereas the remaining eight cells (44%) exceeded this value. Our data suggests that the neural mechanisms for encoding retinal disparities present in dynamic random dot stereograms may not be related to the preferred orientation of the cell.
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