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ID 637
本文ファイル
別タイトル
Topographical Analysis of the Hypnagogic EEG
著者
田中 秀樹
堀 忠雄
キーワード
EEG anterior-posterior index
EEG central-peripheral index
EEG topography
Hypnagogic state
NDC
医学
抄録(英)
The present study examined the topographical characteristics for the typical nine EEG patterns during the hypnagogic state. Spectral analysis of the 12 scalp EEGs (F_<p1>, _<p2>, F_7,F_8,F_z, C_3,C_4,P_z, T_5,T_6,O_1 and O_2) was carried out on 10 male students (20-25yr). Topographic maps from consecutive samples of 30sec period for six frequency bands (delta : 2.0-3.8Hz, theta : 4.0-7.4Hz, alpha 1 : 7.6-9.4Hz, alpha 2 : 9.6-11.4Hz, alpha 3 : 11.6-13.4Hz, sigma : 13.0-14.8Hz) were studied from the light off to the stage 3 onset, which was scored by standard sleep stage criterion. Topographic maps demonstrated that the dominant areas of alpha band activities moved from the posterior area (P_z, T_5,T_6,O_1,O_2) to the anterior area (F_<p1>, F_<p2>, F_z, F_7,F_8) on the midline of scalp in association with the progress of hypnagogic EEG stages, which were scored by the criterion of Hori et al. (1991). On the other hand, the dominant area of delta, theta and sigma bands activities were on the central area (F_z, C_3,C_4,P_z) of scalp. The differences of EEG activities between the central and the peripheral areas (F_<p1>, F_<p2>, F_7,F_8,T_5,T_6,O_1,O_2) increased as a function of EEG stages. To describe the topographical characteristics of EEG stages quantitatively, the EEG anterior-posterior (A/P) indexes and the EEG central-peripheral (C/P) indexes were computed for each frequency band and for each stage. The A/P indexes in alpha band started to increase from stage 1 to stage 9 as a function of EEG stages. On the other hand, the sigma band C/P indexes did not increse in early stages, but started to increase rapidly after stage 7. These results show that the sigma C/P indexes are sensitive to detect the EEG changes in later process of hypnagogic state, especially to the vertex sharp wave and spindle activities. The results of this study suggest that the alpha band A/P index and the sigma band C/P index would be good objective indicators to describe the hypnagogic EEG activities.
掲載誌名
広島大学総合科学部紀要. IV, 理系編
19巻
開始ページ
111
終了ページ
122
出版年月日
1993-12-31
出版者
広島大学総合科学部
寄与者
国立情報学研究所
作成年月日
2006-03-21
ISSN
1340-8364
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
部局名
総合科学研究科
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