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Electrical microstimulation suggests two different forms of representation of head-centered space in the intraparietal sulcus of rhesus monkeys

Thier, P. and Andersen, R. A. (1996) Electrical microstimulation suggests two different forms of representation of head-centered space in the intraparietal sulcus of rhesus monkeys. Proceedings of the National Academy of Sciences of the United States of America, 93 (10). pp. 4962-4967. ISSN 0027-8424. PMCID PMC39388. doi:10.1073/pnas.93.10.4962.

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We examined the effects of eye position on saccades evoked by electrical stimulation of the intraparietal sulcus (IPS) of rhesus monkeys. Microstimulation evoked saccades from sites on the posterior bank, floor, and the medial bank of the IPS. The size and direction of the eye movements varied as a function of initial eye position before microstimulation. At many stimulation sites, eye position affected primarily the amplitude and not the direction of the evoked saccades. These "modified vector saccades" were characteristic of most stimulation-sensitive zones in the IPS, with the exception of a narrow strip located mainly on the floor of the sulcus. Stimulation in this "intercalated zone" evoked saccades that moved the eyes into a particular region in head-centered space, independent of the starting position of the eyes. This latter response is compatible with the stimulation site representing a goal zone in head-centered coordinates. On the other hand, the modified vector saccades observed outside the intercalated zone are indicative of a more distributed representation of head-centered space. A convergent projection from many modified vector sites onto each intercalated site may be a basis for a transition from a distributed to a more explicit representation of space in head-centered coordinates.

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Andersen, R. A.0000-0002-7947-0472
Additional Information:© 1996 by the National Academy of Sciences. Communicated by John J. Hopfield, California Institute of Technology, Pasadena, CA, January 16, 1996 (received for review April 28, 1995) The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. §1734 solely to indicate this fact.
Subject Keywords:parietal cortex; eye movements; saccades
Issue or Number:10
PubMed Central ID:PMC39388
Record Number:CaltechAUTHORS:THIpnas96
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10376
Deposited By: Archive Administrator
Deposited On:01 May 2008
Last Modified:08 Nov 2021 21:07

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