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Titolo:
GATING OF SOMATOSENSORY-EVOKED RESPONSES DURING ACTIVE FINGER MOVEMENTS - MAGNETOENCEPHALOGRAPHIC STUDIES
Autore:
KAKIGI R; KOYAMA S; HOSHIYAMA M; WATANABE S; SHIMOJO M; KITAMURA Y;
Indirizzi:
NATL INST PHYSIOL SCI,INTEGRAT PHYSIOL LAB OKAZAKI AICHI 444 JAPAN
Titolo Testata:
Journal of the neurological sciences
fascicolo: 2, volume: 128, anno: 1995,
pagine: 195 - 204
SICI:
0022-510X(1995)128:2<195:GOSRDA>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAN NERVE-STIMULATION; CEREBRAL MAGNETIC RESPONSES; POSTERIOR TIBIAL NERVE; TACTILE STIMULATION; LATENCY ACTIVITY; POTENTIALS; CORTEX; FIELDS; AREAS; HAND;
Keywords:
SOMATOSENSORY EVOKED MAGNETIC FIELDS; MAGNETOENCEPHALOGRAPHY; GATING; MEDIAN NERVE; SENSORY CORTEX; 2ND SENSORY CORTEX;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
R. Kakigi et al., "GATING OF SOMATOSENSORY-EVOKED RESPONSES DURING ACTIVE FINGER MOVEMENTS - MAGNETOENCEPHALOGRAPHIC STUDIES", Journal of the neurological sciences, 128(2), 1995, pp. 195-204

Abstract

The ''gating'' effects caused by active finger movements on somatosensory evoked magnetic fields (SEFs) following stimulation of the mediannerve were examined in normal subjects. The effects of the interfering stimulus were best demonstrated by subtracting the ''interference'' wave forms from the ''control'' wave forms to derive the ''difference'' wave form. The short-latency cortical deflections, N20m-P20m, P30m-N30m and P25m-N35m were significantly attenuated with no latency changes. In contrast, the following middle-latency deflections, the N40m-P40m and the P60m-N60m were clearly changed in terms of latency and duration by the interference. The D30m-U30m and the U60m-D60m in the ''difference'' wave form were derived from these interference changes. It isconsidered that the gating effects on all deflections took place in the hemisphere contralateral to the stimulated median nerve, because all of the equivalent current dipoles (ECDs) of the short- and the middle-latency deflections in the ''control'', ''interference'' and ''difference'' wave forms were located there. The gating effects on the short-latency deflections were suggested to be due to the interactions between the neurons in areas 1 and 3b, which were activated by sensory inputs from cutaneous mechanoreceptors, and the neurons in area 3a which were activated by sensory inputs from the muscle spindles. The gating effects on the middle-latency deflections may mainly be due to the excitations of neurons in area 4 caused by either continuous movement-related activities or by sensory inputs spreading from the sensory cortex.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 14:34:09