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Summary: JOURNAL OF NEUROPHYSIOLOGY
Vol. 76, No. 3, September 1996. Printed in U.S.A.
Motor Intention Activity in the Macaque's Lateral Intraparietal Area
I. Dissociation Of Motor Plan From Sensory Memory
PIETRO MAZZONI, R. MARTYN BRACEWELL, SHABTAI BARASH, AND RICHARD A. ANDERSEN
Department of Brain and Cognitive Sciences,MassachusettsInstitute of Technology, Cambridge, iMassachusetts02139
SUMMARY AND CONCLUSIONS
1. The lateral intraparietal area (area LIP) of the monkey's
posterior parietal cortex (PPC) contains neurons that are active
during saccadic eye movements. These neurons' activity includes
visual and saccade-related components. These responses are spa-
tially tuned and the location of a neuron's visual receptive field
(RF) relative to the fovea generally overlaps its preferred saccade
amplitude and direction (i.e., its motor field, MF). When a delay
is imposed between the presentation of a visual stimulus and a
saccade made to its location (memory saccade task), many LIP
neurons maintain elevated activity during the delay (memory activ-
ity, M), which appears to encode the metrics of the next intended
saccadic eye movement. Recent studies have alternatively sug-
gested that LIP neurons encode the locations of visual stimuli
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