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Location of the polysensory zone in the precentral gyrus of anesthetized monkeys

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Abstract

Neurons in the premotor cortex of macaques respond to tactile, visual and auditory stimuli. The distribution of these responses was studied in five anesthetized monkeys. In each monkey, multiunit activity was studied at a grid of locations across the precentral gyrus. A cluster of sites with polysensory responses was found posterior to the genu of the arcuate sulcus. Tactile and visual responses were represented in all five monkeys, while auditory responses were rarer and found in only two monkeys. This polysensory zone (PZ) was located in the caudal part of premotor cortex. It varied in extent among the monkeys. It was mainly ventral to the genu of the arcuate, in the dorsal and caudal part of the ventral premotor cortex (PMv). In some monkeys it extended more dorsally, into the caudal part of dorsal premotor cortex (PMd). Sensory responses were almost never found in the rostral part of PMd. We suggest that the polysensory zone may contribute to the guidance of movement on the basis of tactile, visual and auditory signals.

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Published online: 24 August 2000

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Graziano, M.S.A., Gandhi, S. Location of the polysensory zone in the precentral gyrus of anesthetized monkeys. Exp Brain Res 135, 259–266 (2000). https://doi.org/10.1007/s002210000518

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  • DOI: https://doi.org/10.1007/s002210000518

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