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ID 25744
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別タイトル
Coherence analysis of the EEG in hypnagogic period
著者
森川 俊雄
堀 忠雄
キーワード
Hypnagogic period
spectral analysis
EEG power
EEG coherence
NDC
医学
抄録(英)
Present study was examined the spatiotemporal changes of EEG during hypnagogic period or waking-sleeping transition. EEG (F3, F4, C3, C4, P3, P4. O1, O2), EOG and EMG were recorded from waking to manually scored stage 3. Spectral analysis of four scalp EEGs (F3, C3, P3, O1) were carried out. Power and coherence spectra (F3-C3, C3-P3, P3-O1, F3-P3, C3-O1, F3-O1) were obtained every 30 s (25 ms X 200 points X 5). Coherence spectra were determined for the four frequency bands (δ: 0.6-3.4 Hz, θ: 3.6-7.4 Hz, α: 7.6-12.4 Hz, σ: 12.6-14.4 Hz).

The results were as follows:

(1) In the contour mapping type of display, the coherence spectra which were connected with O1 showed clear differences among all pairs.

(2) Comparisons of temporal variations among four EEG coherence band showed that the delta band had regional differences and the sigma band had no regional differences.

(3) The delta band coherence which were connected with O1 (F3-O1, C3-O1, P3-O1) showed a sharp drop immediately before the disappearance of alpha wave, while the other delta bands coherence did not any change.

These results suggest that if the sharp drop of the delta band coherence is characteristic in the hypnagogic period, the period starts before the disappearance of alpha wave.
掲載誌名
広島大学総合科学部紀要. III, 情報行動科学研究
13巻
開始ページ
81
終了ページ
89
出版年月日
1990-02-28
出版者
広島大学総合科学部
ISSN
0385-1478
NCID
SelfDOI
言語
日本語
NII資源タイプ
紀要論文
広大資料タイプ
学内刊行物(紀要等)
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 1989 by Faculty of Integrated Arts and Sciences, Hiroshima University. All rights reserved.
部局名
総合科学研究科
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