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ID 25744
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title alternative
Coherence analysis of the EEG in hypnagogic period
creator
Morikawa, Toshio
Hori, Tadao
subject
Hypnagogic period
spectral analysis
EEG power
EEG coherence
NDC
Medical sciences
abstract
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.
journal title
Memoirs of the Faculty of Integrated Arts and Sciences. III, Studies in information and behavior sciences
volume
Volume 13
start page
81
end page
89
date of issued
1990-02-28
publisher
広島大学総合科学部
issn
0385-1478
ncid
SelfDOI
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 1989 by Faculty of Integrated Arts and Sciences, Hiroshima University. All rights reserved.
department
Graduate School of Integrated Arts and Sciences
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