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Behavioral/Systems/Cognitive The Posterior Parietal Cortex Encodes in Parallel Both Goals
 

Summary: Behavioral/Systems/Cognitive
The Posterior Parietal Cortex Encodes in Parallel Both Goals
for Double-Reach Sequences
Daniel Baldauf, He Cui, and Richard A. Andersen
Division of Biology, California Institute of Technology, Pasadena, California 91125
The parietal reach region (PRR) is known to be involved in the preparation of visually guided arm movements to single targets. We
exploredwhetherPRRencodesonlythetargetofthenextmovementor,alternatively,alsoasubsequentgoalinadouble-reachsequence.
Two monkeys were trained to memorize the locations of two peripheral cues and to prepare for a memory-guided delayed double-reach
sequence.OnaGO-signaltheyhadtoreachinapredefinedordertobothrememberedtargetlocationswithoutbreakingeyefixation.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
memoryperiod,mostPRRcellsencodedthefirstaswellasthesecondgoaloftheplannedreachingsequence.Theresultsindicatethatthe
posterior parietal cortex is involved in the spatial planning of more complex action patterns and represents immediate and subsequent
movement goals.
Key words: double-reach; motor planning; parietal reach region; movement sequences; sensorimotor; hand; attention
Introduction
Many actions we perform every day are complex, coordinated
concatenations of single movements. Movement sequences are
crucial to perform fluently in various tasks. Several studies have
started to investigate how the primate brain programs sequential

  

Source: Andersen, Richard - Division of Biology, California Institute of Technology
Crawford, Doug - York Centre for Vision Research, York University (Toronto)

 

Collections: Biology and Medicine