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Titolo:
The somatosensory evoked magnetic fields
Autore:
Kakigi, R; Hoshiyama, M; Shimojo, M; Naka, D; Yamasaki, H; Watanabe, S; Xiang, J; Maeda, K; Lam, K; Itomi, K; Nakamura, A;
Indirizzi:
Natl Inst Physiol Sci, Dept Integrat Physiol, Okazaki, Aichi 4448585, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 4448585 i, Aichi 4448585, Japan Natl Inst Longev Sci, Dept Biofunct Res, Aichi, Japan Natl Inst Longev Sci Aichi Japan v Sci, Dept Biofunct Res, Aichi, Japan
Titolo Testata:
PROGRESS IN NEUROBIOLOGY
fascicolo: 5, volume: 61, anno: 2000,
pagine: 495 - 523
SICI:
0301-0082(200008)61:5<495:TSEMF>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAN NERVE-STIMULATION; TACTILE INTERFERENCE STIMULATION; LARGE-ARRAY BIOMAGNETOMETER; PRIMARY SENSORIMOTOR CORTEX; POSTERIOR PARIETAL CORTEX; COMPOUND ACTION FIELDS; CORTICAL REORGANIZATION; PERIPHERAL-NERVE; SCALP TOPOGRAPHY; HUMAN BRAIN;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
144
Recensione:
Indirizzi per estratti:
Indirizzo: Kakigi, R Natl Inst Physiol Sci, Dept Integrat Physiol, Okazaki, Aichi 4448585, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 4448585 448585, Japan
Citazione:
R. Kakigi et al., "The somatosensory evoked magnetic fields", PROG NEUROB, 61(5), 2000, pp. 495-523

Abstract

Averaged magnetoencephalography (MEG) following somatosensory stimulation,somatosensory evoked magnetic field(s) (SEF), in humans are reviewed. The equivalent current dipole(s) (ECD) of the primary and the following middle-latency components of SEF following electrical stimulation within 80-100 msare estimated in area 3b of the primary somatosensory cortex (SI), the posterior bank of the central sulcus, in the hemisphere contralateral to the stimulated site. Their sites are generally compatible with the homunculus which was reported by Penfield using direct cortical stimulation during surgery. SEF to passive finger movement is generated in area 3a or 2 of SI, unlike with electrical stimulation. Long-latency components with peaks of approximately 80-120ms are recorded in the bilateral hemispheres and their ECD are estimated in the secondary somatosensory cortex (SII) in the bilateral hemispheres. We also summarized (1) the gating effects on SEF by interference tactile stimulation or movement applied to the stimulus site, (2) clinical applications of SEF in the fields of neurosurgery and neurology and (3) cortical plasticity (reorganization) of the SI. SEF specific to painful stimulation is also recorded following painful stimulation by CO2 laser beam. Pain-specific components are recorded over 150 ms after the stimulus and their ECD are estimated in the bilateral SII and the limbic system. We introduced a newly-developed multi (12)-channel gradiometer system with the smallest and highest quality superconducting quantum interference device (micro-SQUID) available to non-invasively detect the magnetic fields of a human peripheral nerve. Clear nerve action fields (NAFs) were consistently recorded from all subjects. (C) 2000 Elsevier Science Ltd. All rights reserved.

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Documento generato il 08/08/20 alle ore 09:02:20