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Titolo:
Correspondence between short-latency somatosensory evoked brain potentialsand cortical magnetic fields following median nerve stimulation
Autore:
Hoshiyama, M; Kakigi, R;
Indirizzi:
Natl Inst Physiol Sci, Dept Integrat Physiol, Okazaki, Aichi 4448585, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 4448585 i, Aichi 4448585, Japan
Titolo Testata:
BRAIN RESEARCH
fascicolo: 2, volume: 908, anno: 2001,
pagine: 140 - 148
SICI:
0006-8993(20010727)908:2<140:CBSSEB>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSTERIOR PARIETAL CORTEX; SENSORIMOTOR CORTEX; RECORDINGS; HAND; SCALP;
Keywords:
SEF; SEP; primary sensory cortex; median nerve; human;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Hoshiyama, M Natl Inst Physiol Sci, Dept Integrat Physiol, Okazaki, Aichi 4448585, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 4448585 585, Japan
Citazione:
M. Hoshiyama e R. Kakigi, "Correspondence between short-latency somatosensory evoked brain potentialsand cortical magnetic fields following median nerve stimulation", BRAIN RES, 908(2), 2001, pp. 140-148

Abstract

We investigated the somatosensory evoked cortical magnetic field (SEF) components corresponding to the somatosensory evoked potential (SEP) components between 20 and 30 ms after median nerve stimulation. SEP and SEF were simultaneously recorded after right median nerve stimulation in seven healthy subjects. Twenty single-sweep epochs of SEF and SEP were selected, in whichthe first SEF component at 20 ms, 1M, and the second component at 30 ms, 2M, were identifiable. The selected epochs were re-averaged at the peaks of 1M and 2M as the triggering periods (zero ms). The width of the deflection,the temporal dispersion (TD), of SEP components, P20 and N30 (Fz-A2), N20,cP25 and cN30 (C3-Fz), N20 and pP30 (P3-A2), and N20 and P30 (P3-Fz), werecompared between three averaging conditions. The N20/P20 components showedsignificantly smaller TDs when the epochs were averaged at the 1M peak (one-way factorial ANOVA, P<0.02) than those of the control, but averaging at the 1 M peak did not decrease the TD of N30/P30. On averaging at the 2M peak, the TDs of N30/P30 components recorded from Fz-A2 and P3-Fz were smallerthan those of the control. Neither the averaging at the 1M peak nor that at the 2M peak decreased the TD of the cP25 and cN30 components, Source analysis showed that the equivalent current dipoles (ECDs) for both 1M and 2M were located around the central sulcus, possibly in the primary somatosensory cortex (SI). We confirmed that the 1M and 2M temporally linked with N20/P20 and N30/P30, respectively. The difference of TD of N20/P20 and N30/P30 indicated that the neural pathways to the responses to N20/P20 and N30/P30 might be independent. (C) 2001 Elsevier Science BY All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 20:17:43