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The Posterior Parietal Cortex Encodes in Parallel Both Goals for Double-Reach Sequences

Baldauf, Daniel and Cui, He and Andersen, Richard A. (2008) The Posterior Parietal Cortex Encodes in Parallel Both Goals for Double-Reach Sequences. Journal of Neuroscience, 28 (40). pp. 10081-10089. ISSN 0270-6474.

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The parietal reach region (PRR) is known to be involved in the preparation of visually guided arm movements to single targets. We explored whether PRR encodes only the target of the next movement or, alternatively, also a subsequent goal in a double-reach sequence. Two monkeys were trained to memorize the locations of two peripheral cues and to prepare for a memory-guided delayed double-reach sequence. On a GO-signal they had to reach in a predefined order to both remembered target locations without breaking eye fixation. The movement goals were arranged such that either the first or the second target was inside the response field of an isolated neuron. We analyzed the neural activity of single cells in PRR during the late memory period between cue offset and the GO-signal. During this memory period, most PRR cells encoded the first as well as the second goal of the planned reaching sequence. The results indicate that the posterior parietal cortex is involved in the spatial planning of more complex action patterns and represents immediate and subsequent movement goals.

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Additional Information:Copyright © 2008 Society for Neuroscience. Received July 20, 2008; accepted Aug. 11, 2008. This work was supported by the German Academic Exchange Service (Deutscher Akademischer Austausch Dienst), the Fulbright Commission, the National Eye Institute, and the James G. Boswell Foundation. We thank Tessa Yao for editorial assistance, Kelsie Pejsa and Nicole Sammons for animal care, EunJung Hwang and Viktor Shcherbatyuk for technical assistance, and Heiner Deubel.
Funding AgencyGrant Number
Deutscher Akademischer Austausch DienstUNSPECIFIED
Fulbright CommissionUNSPECIFIED
National Eye InstituteUNSPECIFIED
James G. Boswell FoundationUNSPECIFIED
Subject Keywords:double-reach; motor planning; parietal reach region; movement sequences; sensorimotor; hand; attention
Issue or Number:40
Record Number:CaltechAUTHORS:BALjns08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11870
Deposited By: Archive Administrator
Deposited On:08 Oct 2008 05:30
Last Modified:26 Dec 2012 10:22

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