眠気の変化に伴う脳波トポグラフィの変動

Topographic mapping of EEG with the variation of sleepiness

Hayashi Mitsuo

Morikawa Toshio

Hori Tadao

広島大学総合科学部紀要. III, 情報行動科学研究

Memoirs of the Faculty of Integrated Arts and Sciences. III, Studies in information and behavior sciences

The relationship between the EEG topography and sleepiness was investigated in 5 normal students (aged 21- 26 yrs). They were assessed their sleepiness for 12 hours (19:00 to 07:00) at 20 min intervals via Kwansei-Gakuin sleepiness scale (KSS), visual analog scale (VAS) and the multiple sleep latency test (MSLT). The power spectra derived from 16 EEG leads were topographically displayed for every 1 Hz from 8 to 13 Hz, based on the initial 30 s EEG recordings of each MSLT period. With increasing sleepiness, the slow alpha band activities (8-9 Hz) developed around the occipital area, while the fast alpha band activities (12-13 Hz) tended to obscure at the parietal area. The topographic pattern for the activities of intermediate alpha band (10-11 Hz) were unchanged over the experimental period. These data suggest that the increase or decrease of the amplitude of the slow alpha activity and the fast alpha activity reflect the variation of sleepiness. The present study supplied the new perspectives for the study of sleepiness in terms of topographic mapping of the waking EEG.

Medical sciences [ 490 ]

jpn

広島大学総合科学部

Copyright (c) 1989 by Faculty of Integrated Arts and Sciences, Hiroshima University. All rights reserved.

[ISSN] 0385-1478

[NCID] AN00116614