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The Journal of Neurophysiology Vol. 83 No. 3 March 2000, pp. 1764-1769
Copyright ©2000 by the American Physiological Society
RAPID COMMUNICATION
Department of Physiology, Tohoku University School of Medicine, Sendai 980, Japan
Fujii, Naotaka,
Hajime Mushiake, and
Jun Tanji.
Rostrocaudal Distinction of the Dorsal Premotor Area Based on
Oculomotor Involvement. J. Neurophysiol. 83: 1764-1769, 2000. To investigate functional differences
between the rostral and caudal parts of the dorsal premotor cortex
(PMd), we first examined the effects of intracortical microstimulation
(ICMS) while monkeys were performing oculomotor and limb motor tasks or
while they were at rest. We found that saccades were evoked from the
rostral part (PMdr) whereas ICMS in the caudal part (PMdc)
predominantly produced forelimb or body movements. Subsequently, we
examined neuronal activity in relation to the performance of visually
cued and memorized saccades while monkeys reached an arm toward a
visual target. We found that roughly equal numbers of PMdr neurons were active during performance of the oculomotor and limb motor tasks. In
contrast, the majority of PMdc neurons were related preferentially to
arm movements and not to saccades. In the subsequent analysis, we found
that the oculomotor effects evoked in the PMdr differ from the effects
evoked in either the frontal eye field (FEF) or supplementary eye field
(SEF). These findings suggest that the PMdr is involved in oculomotor
as well as limb motor behavior. However, the oculomotor involvement of
the PMdr seems to have a functional aspect different from that
operating in the FEF and SEF.
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