Identifying Components of Human Movement-Related Cortical Potential using Time-Frequency Analysis based on Wavelet Transform

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  • ヒト運動関連脳電位のウェーブレット変換を用いた時間周波数解析による成分同定
  • ヒト ウンドウ カンレン ノウ デンイ ノ ウェーブレット ヘンカン オ モチイタ ジカン シュウハスウ カイセキ ニ ヨル セイブン ドウテイ

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Abstract

Electroencephalogram (EEG) has been generally known as a non-destructive method to examine the function of human brain. The aim of this paper is to propose a new method using Wavelet Transform to analyze and to identify the components of Movement - Related Cortical Potential (MRCP) which is evoked accompanying with the human voluntary muscle behaviors. In this study three healthy-volunteers were participated. The EEG was recorded with the 5-channel referential derivations, Fz, Cz, C3, C4, Pz, referenced to the right earlobe based on the international 10-20 system. The voluntary activity was recorded with the electrode arranged on the palm side of the metacarpophalangeal joint when the subjects flexed the right-hand index finger and eyes closed. <br> I have found the insights into the temporal dynamics of MRCP. About 10Hz signals were recorded at all electrodes when the voluntary activity started. The higher level signals of about 10Hz were recorded at Fz from about 0.4s after the activity started. About 5Hz signals appeared from about 0.9s before to 0.3s after the activity started. This method is also useful in point of the number of averaging, because it's not needed many subjects and trials to identify the components of the MRCP as shown in the past publications.

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