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Titolo:
Structure of the auditory evoked magnetic fields during sleep
Autore:
Naka, D; Kakigi, R; Hoshiyama, M; Yamasaki, H; Okusa, T; Koyama, S;
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:
NEUROSCIENCE
fascicolo: 2, volume: 93, anno: 1999,
pagine: 573 - 583
SICI:
0306-4522(1999)93:2<573:SOTAEM>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
TONOTOPIC ORGANIZATION; SOURCE LOCATION; RESPONSES; CORTEX; LATENCY; FREQUENCY; COMPONENT; LOCALIZATION; TINNITUS; STIMULI;
Keywords:
magnetoencephalography; MEG; sleep; auditory evoked response; auditory perception; tonotopy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
35
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:
D. Naka et al., "Structure of the auditory evoked magnetic fields during sleep", NEUROSCIENC, 93(2), 1999, pp. 573-583

Abstract

We studied the effects of sleep on auditory evoked magnetic fields following pure tone stimulation applied to the right ear of 10 healthy normal volunteers to investigate the changes in the processing of auditory perception in the primary auditory cortex. Dual 37-channel biomagnetometers were used to record auditory evoked magnetic fields over the bilateral temporal lobesin response to presented tones. Auditory evoked magnetic fields were compared for three stimulus frequencies (250, 1000 and 4000 Hz) and three sleep stages (awake state, sleep stages 1 and 2). Four main components, M50, M100, M150 and M200, were identified with latencies of approximately 50, 100, 150 and 200 ms, respectively. The latency ofeach component had a tendency to be prolonged with the depth of sleep stage in all frequencies. The amplitude ratios of the early-latency components (M50 and M100) showed a tendency of reduction compared with the same components in the awake state. By contrast, the amplitude ratios of the long-latency components (M150 and M200) were significantly enhanced with an increasein the sleep stage compared with the same components in the awake state. The equivalent current dipoles of all components in all conditions were detected at the superior temporal cortex (the primary auditory cortex). As for the changes in the equivalent current dipole location of each component, the equivalent current dipole was detected in the more posterior and medial region in responses to the high-frequency tone (1000 and 4000 Hz) compared with those to 250 Hz tone stimulation. Although the equivalent current dipoles of the early-latency components (M50 and M100) were in regions more anterior and superior compared to those in the awake state, there was no consistent tendency of changes in equivalent current dipole locations between each sleep stage in the late-latency components (M150 and M200). These findings are probably due to the difference in generating mechanisms between the early- and late-latency components. (C) 1999 IBRO. published by Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 03:27:50