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Summary: RESEARCH ARTICLE
Time-invariant reference frames for parietal reach activity
Christopher A. Buneo Æ Aaron P. Batista Æ
Murray R. Jarvis Æ Richard A. Andersen
Received: 18 July 2007 / Accepted: 29 February 2008 / Published online: 27 March 2008
Ó Springer-Verlag 2008
Abstract Neurophysiological studies suggest that the
transformation of visual signals into arm movement com-
mands does not involve a sequential recruitment of the
various reach-related regions of the cerebral cortex but a
largely simultaneous activation of these areas, which form
a distributed and recurrent visuomotor network. However,
little is known about how the reference frames used to
encode reach-related variables in a given ``node'' of this
network vary with the time taken to generate a behavioral
response. Here we show that in an instructed delay reach-
ing task, the reference frames used to encode target
location in the parietal reach region (PRR) and area 5 of the
posterior parietal cortex (PPC) do not evolve dynamically
in time; rather the same spatial representation exists within
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