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J Neurophysiol 87: 1123-1128, 2002;
0022-3077/02 $5.00
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The Journal of Neurophysiology Vol. 87 No. 2 February 2002, pp. 1123-1128
Copyright ©2002 by the American Physiological Society

RAPID COMMUNICATION

Contrasting Neuronal Activity in the Dorsal and Ventral Premotor Areas During Preparation to Reach

Eiji Hoshi1 and Jun Tanji1,2

 1Department of Physiology, Tohoku University School of Medicine, Sendai 980-8575; and  2Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation, Kawaguchi 332-0012, Japan

Hoshi, Eiji and Jun Tanji. Contrasting Neuronal Activity in the Dorsal and Ventral Premotor Areas During Preparation to Reach. J. Neurophysiol. 87: 1123-1128, 2002. We compared neuronal activity in the dorsal and ventral premotor areas (PMd and PMv, respectively) when monkeys were preparing to perform arm-reaching movements in a motor-set period before their actual execution. They were required to select one of four possible movements (reaching to a target on the left or right, using either the left or right arm) in accordance with two sets of instruction cues, followed by a delay period, and a subsequent motor-set period. During the motor-set period, the monkeys were required to get ready for a movement-trigger signal to start the arm-reach promptly. We analyzed the activity of 211 PMd and 109 PMv neurons that showed selectivity for the combination of the two instruction cues during the motor-set period. A majority (53%) of PMd neurons exhibited activity significantly tuned to both target location and arm use, and an approximately equal number of PMd neurons showed selectivity to either forthcoming arm use or target location. In contrast, 60% of PMv neurons showed selectivity for target location only and not for arm use. These findings point to preference in the use of neuronal activity in the two areas: preparation for action in the PMd and preparation for target acquisition in the PMv.




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