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J Neurophysiol 85: 539-544, 2001;
0022-3077/01 $5.00
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The Journal of Neurophysiology Vol. 85 No. 2 February 2001, pp. 539-544
Copyright ©2001 by the American Physiological Society

The Parietal Reach Region Codes the Next Planned Movement in a Sequential Reach Task

Aaron P. Batista1 and Richard A. Andersen2

 1Computation and Neural Systems Program and  2Division of Biology, California Institute of Technology, Pasadena, California 91125

Batista, Aaron P. and Richard A. Andersen. The Parietal Reach Region Codes the Next Planned Movement in a Sequential Reach Task. J. Neurophysiol. 85: 539-544, 2001. Distinct subregions of the posterior parietal cortex contribute to planning different movements. The parietal reach region (PRR) is active during the delay period of a memory-guided reach task but generally not active during a memory-guided saccade task. We explored whether the reach planning activity in PRR is related to remembering targets for reaches or if it is related to specifying the reach that the monkey is about to perform. Monkeys were required to remember two target locations and then reach to them in sequence. Before the movements were executed, PRR neurons predominantly represented the reach about to be performed and only rarely represented the remembered target for the second reach. This indicates the area plays a role in specifying the target for the impending reach and may not contribute to storing the memory of subsequent reach targets.




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