Role of the posterior parietal cortex in updating reaching movements to a visual target
Nature NeurosciencePublished 1 June 1999
Michel Desmurget, Charles M. Epstein, Robert S. Turner, Claude Prablanc, Garrett E. Alexander, Scott T. Grafton
Citations839
SJR quartileQ1
SJR score11.20
SNIP4.70
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TL;DR
Transcranial magnetic stimulation was applied over the left PPC during target presentation and disrupted path corrections that normally occur in response to target jumps, but had no effect on those directed at stationary targets.
Abstract
The exact role of posterior parietal cortex (PPC) in visually directed reaching is unknown. We propose that, by building an internal representation of instantaneous hand location, PPC computes a dynamic motor error used by motor centers to correct the ongoing trajectory. With unseen right hands, five subjects pointed to visual targets that either remained stationary or moved during saccadic eye movements. Transcranial magnetic stimulation (TMS) was applied over the left PPC during target presentation. Stimulation disrupted path corrections that normally occur in response to target jumps, but had no effect on those directed at stationary targets. Furthermore, left-hand movement corrections were not blocked, ruling out visual or oculomotor effects of stimulation.
Keywords
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