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Titolo:
EFFECTS OF MOVEMENT AND MOVEMENT IMAGERY ON SOMATOSENSORY-EVOKED MAGNETIC-FIELDS FOLLOWING POSTERIOR TIBIAL NERVE-STIMULATION
Autore:
KAKIGI R; SHIMOJO M; HOSHIYAMA M; KOYAMA S; WATANABE S; NAKA D; SUZUKI H; NAKAMURA A;
Indirizzi:
NATL INST PHYSIOL SCI,DEPT INTEGRAT PHYSIOL OKAZAKI AICHI 444 JAPAN NATL INST LONGEV SCI OBU 474 JAPAN
Titolo Testata:
Cognitive brain research
fascicolo: 3, volume: 5, anno: 1997,
pagine: 241 - 253
SICI:
0926-6410(1997)5:3<241:EOMAMI>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
TACTILE STIMULATION; FINGER MOVEMENTS; SCALP TOPOGRAPHY; POTENTIALS; COMPONENTS; RESPONSES; SEPS; HAND;
Keywords:
SOMATOSENSORY EVOKED MAGNETIC FIELD; MAGNETOENCEPHALOGRAPHY; GATING; TIBIAL NERVE; MOVEMENT; ATTENTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
R. Kakigi et al., "EFFECTS OF MOVEMENT AND MOVEMENT IMAGERY ON SOMATOSENSORY-EVOKED MAGNETIC-FIELDS FOLLOWING POSTERIOR TIBIAL NERVE-STIMULATION", Cognitive brain research, 5(3), 1997, pp. 241-253

Abstract

We examined the ''gating'' effects caused by active and passive movements of toes and by ''movement imagery'' (mental moving of the toe without actual movements) on somatosensory evoked magnetic fields (SEFs) following stimulation of the posterior tibial nerve in normal subjects. Active and passive movements significantly attenuated the short- andmiddle-latency cortical components (P < 0.001) with no latency change, and the effects of the active movements were larger than those of the passive movements. In contrast, the subsequent long-latency component with a latency of about 100 ms was enhanced only by the active movements. Therefore, both centrifugal and centripetal mechanisms should beconsidered. The gating effects by movements on all components may occur in the primary sensory cortex (SI) in the hemisphere contralateral to the stimulated nerve, because all of the equivalent current dipoles(ECDs) of the components in the ''control'' and each ''interference''waveform were located there. Active movements of the toes contralateral to the stimulated nerve caused no significant gating effect. The short-latency components were not consistently changed by ''movement imagery'', but the middle- and long-latency components were enhanced. Their ECDs were located in the SI contralateral to the stimulated nerve and in the SII in bilateral hemispheres. Therefore, we speculated that brain responses to somatosensory stimulation, particularly components generated in SII, were affected by volitional changes. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 05:20:02