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Titolo:
TEMPORAL CHANGES OF PYRAMIDAL TRACT ACTIVITIES AFTER DECISION OF MOVEMENT - A STUDY USING TRANSCRANIAL MAGNETIC STIMULATION OF THE MOTOR CORTEX IN HUMANS
Autore:
HOSHIYAMA M; KAKIGI R; KOYAMA S; TAKESHIMA Y; WATANABE S; SHIMOJO M;
Indirizzi:
NATL INST PHYSIOL SCI,DEPT INTEGRAT PHYSIOL OKAZAKI AICHI 444 JAPAN
Titolo Testata:
ELECTROMYOGRAPHY AND MOTOR CONTROL-ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY
fascicolo: 4, volume: 105, anno: 1997,
pagine: 255 - 261
SICI:
0924-980X(1997)105:4<255:TCOPTA>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
PREFRONTAL CORTEX; HAND MOVEMENT; MONKEY; RESPONSES; MUSCLE; INHIBITION; TOPOGRAPHY; ONSET;
Keywords:
MAGNETIC STIMULATION; GO/NO-GO; CHOICE REACTION TIME STUDY; MUSCLE EVOKED POTENTIAL; HUMAN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
M. Hoshiyama et al., "TEMPORAL CHANGES OF PYRAMIDAL TRACT ACTIVITIES AFTER DECISION OF MOVEMENT - A STUDY USING TRANSCRANIAL MAGNETIC STIMULATION OF THE MOTOR CORTEX IN HUMANS", ELECTROMYOGRAPHY AND MOTOR CONTROL-ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY, 105(4), 1997, pp. 255-261

Abstract

To elucidate the effects of the decision to move on the pyramidal tract in humans, we examined the changes in the motor evoked potentials (MEP) of the forearm muscles following transcranial magnetic cortical stimulation (TMS) of the hand area during a go/no-go hand-movement taskin 10 normal subjects. The subjects performed an extension of the right wrist according to the go, no-go and control signals, one of which was randomly presented on a TV. A single TMS was applied to the primary hand motor area in the left hemisphere 0-300 ms after each signal. The MEPs recorded from the wrist extensor and flexor muscles changed inamplitude after both go and no-go signals. In comparison with the control, the MEPs were significantly facilitated in the agonistic muscles(wrist extensor muscles) and attenuated in the antagonistic muscles (wrist flexor muscles), at the latencies of 100-200 ms after the go signal (P < 0.02). In contrast the MEPs of both the extensor and flexor muscles were significantly attenuated during the period of 100-200 ms after the no-go signal (P < 0.001). We speculate that there is strong inhibition on the pyramidal tract after the no-go signal and that the inhibitory effect is nonspecific to the target muscles. This inhibitiondiffers from the reciprocal inhibition of the MEP observed in antagonistic muscles after the go signal, and it is probably related to the movement decision originating in the prefrontal cortex. (C) 1997 Elsevier Science Ireland Ltd.

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Documento generato il 09/07/20 alle ore 01:12:41