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An unexpected specialization for horizontal disparity in primate primary visual cortex.

Abstract：

:The horizontal separation of the eyes means that objects nearer or farther than the fixation point project to different locations on the two retinae, differing principally in their horizontal coordinates (horizontal binocular disparity). Disparity-selective neurons have generally been studied with disparities applied in only one direction (often horizontal), which cannot determine whether the encoding is specialized for processing disparities along the horizontal axis. It is therefore unclear if disparity selectivity represents a specialization for naturally occurring disparities. I used random dot stereograms to study disparity-selective neurons from the primary visual cortex (V1) of awake fixating monkeys. Many combinations of vertical and horizontal disparity were used, characterizing the surface of responses as a function of two-dimensional disparity. Here I report that the response surface usually showed elongation along the horizontal disparity axis, despite the isotropic stimulus. Thus these neurons modulated their firing rate over a wider range of horizontal disparity than vertical disparity. This demonstrates that disparity-selective cells are specialized for processing horizontal disparity, and that existing models of disparity selectivity require substantial revision.

journal_name

Nature

journal_title

Nature

authors

Cumming BG

doi

10.1038/nature00909

keywords:

subject

Has Abstract

pub_date

2002-08-08 00:00:00

pages

633-6

issue

6898

eissn

0028-0836

issn

1476-4687

pii

nature00909

journal_volume

418

pub_type

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