The bispectrum of a stationary stochastic process, which contains a wave component that is not sine-shaped, describes the amplitude and phase relations between the harmonic components of that wave. The bispectrum of EEG signal gives information about an averaged wave shape of a dominant component of the signal, i. e., whether it contains phase-locked higher order terms, and the amplitude and phase relations between the components can be estimated if the phase-locked relation exists. Normal subjects were recorded while lying down with eyes closed. The monopolar recordings with α-activity from@ electrodes on left and right occipital regions were analyzed by means of the bispectrum. For the recordings that were obtained within 30 minutes and had typical α-activity, the modulus and phase of the bispectrum remain almost constant in spite of individual differences. The bispectra of the recordings from corresponding left and right sides showed the same value for the recordings that were regarded to have symmetry. Asymmetry of left and right sides of the bispectra was observed in the data during the attack of migraine. These findings are statistically examined and discussed.
雑誌名
医用電子と生体工学 : 日本ME学会雑誌 = Japanese journal of medical electronics and biological engineering : JJME
巻
11
号
4
ページ
284 - 292
発行年
1973-08
ISSN
00213292
書誌レコードID
AN00016981
フォーマット
application/pdf
日本十進分類法
492.8
出版者
日本ME学会
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バイスペクトルによるα波波形の解析
tachi_1973_d02.pdf
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