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Deficits in speed discrimination following lesions of the lateral suprasylvian cortex in the cat

Published online by Cambridge University Press:  02 June 2009

Tatiana Pasternak ,
Kris M. Horn  and
John H.R. Maunsell
Tatiana Pasternak
Affiliation:
Departments of Neurobiology and Anatomy, Physiology, and Center for Visual Science, University of Rochester, Rochester
Kris M. Horn
Affiliation:
Departments of Neurobiology and Anatomy, Physiology, and Center for Visual Science, University of Rochester, Rochester
John H.R. Maunsell
Affiliation:
Departments of Neurobiology and Anatomy, Physiology, and Center for Visual Science, University of Rochester, Rochester
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Abstract

We examined the role of the lateral suprasylvian (LS) cortex in motion perception by testing the ability of three cats to detect moving targets and to discriminate differences in stimulus direction and speed before and after making bilateral ibotenic acid lesions in LS. The lesions had little or no effect on contrast sensitivity for detecting moving sinusoidal gratings. Moreover, we found no deficits in discriminating opposite directions of motion: the cats discriminated grating directions at threshold contrasts. All three cats, however, showed permanent deficits in discriminating differences in speed and in flicker rate. The deficits were most pronounced at higher temporal and spatial frequencies and at lower contrasts. This result suggests that LS plays an important role in the analysis of stimulus speed. It appears that information needed for discriminating opposite directions of motion may be signalled by visual areas outside LS.

Keywords

Speed and flicker discriminationDirection discriminationLateral suprasylvian cortexIbotenic acid lesionsCats
Type
Research Articles
Information
Visual Neuroscience , Volume 3 , Issue 4 , October 1989 , pp. 365 - 375
Copyright
Copyright © Cambridge University Press 1989

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