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Science 1 December 2000:
Vol. 290. no. 5497, pp. 1782 - 1786
DOI: 10.1126/science.290.5497.1782
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Reports

Coding the Location of the Arm by Sight

Michael S. A. Graziano,* Dylan F. Cooke, Charlotte S. R. Taylor

Area 5 in the parietal lobe of the primate brain is thought to be involved in monitoring the posture and movement of the body. In this study, neurons in monkey area 5 were found to encode the position of the monkey's arm while it was covered from view. The same neurons also responded to the position of a visible, realistic false arm. The neurons were not sensitive to the sight of unrealistic substitutes for the arm and were able to distinguish a right from a left arm. These neurons appear to combine visual and somatosensory signals in order to monitor the configuration of the limbs. They could form the basis of the complex body schema that we constantly use to adjust posture and guide movement.

Department of Psychology, Princeton University, Princeton, NJ 08544, USA.
*   To whom correspondence should be addressed. E-mail: graziano{at}princeton.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)