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Vision Research 40 (2000) 14331441 Intention-related activity in the posterior parietal cortex: a review

Summary: Vision Research 40 (2000) 14331441
Intention-related activity in the posterior parietal cortex: a review
L.H. Snyder, A.P. Batista, R.A. Andersen *
Di6ision of Biology, California Institute of Technology, Mail Code 216-76, 1200 E. California Boule6ard, Pasadena, CA 91125, USA
Received 8 May 1999; received in revised form 4 January 2000
Over the last few years it is becoming increasingly apparent that an important role of the posterior parietal cortex is to process
sensory information for the purpose of planning actions. We review studies showing that a large component of neural activity in
area LIP is related to planning saccades and activity in a nearby parietal reach region (PRR) to reaches. This intention related
activity dominates the delay period in delayed movement tasks, and also comprises a substantial component of the transient
response. These findings, along with additional anatomical and physiological evidence, lends support to the idea that different
cortical areas within the PPC represent plans for different actions. We also found strong modulation of activity when movement
plans were changed without changes in the locus of attention. This result suggests that PPC, which has been postulated to play
a role in shifting attention, may also play a role in changing movement intentions. Sensory related activity was also present in
these tasks and may be related to the stimulus or to attention. These experiments show that there are intention and sensory related
activities in the PPC consistent with its proposed role in sensory-motor transformations. These studies also show that care must
be taken to measure intention-related signals and not assume that all task dependent modulation in the PPC reflects attention.
2000 Elsevier Science Ltd. All rights reserved.
Keywords: Intention-related activity; Posterior parietal cortex; Process sensory information


Source: Andersen, Richard - Division of Biology, California Institute of Technology
Snyder, Larry - Department of Anatomy and Neurobiology, Washington University in St. Louis


Collections: Biology and Medicine