低频光诱发脑电θ波段近似熵特征研究

Approximate Entropy Evaluation of EEG θ Rhythm Based on Low-Frequency Photon Stimuli

采用近似熵算法得到19名健康志愿者在5Hz频率的光(每秒光重复诱发5次)诱发前后的脑电(EEG)θ波段近似熵值(Apenθ),经T-检验(P<0.05)发现光诱发后Apenθ值显著下降,其中在顶部、前额、颞部和枕部位置有显著性变化,颞部和枕部变化最大,左右半脑平均Apenθ均减少,右脑区更为显著。结果表明Apenθ能够描述外部光诱发情况下的EEG波段特征,并定量给出外部光诱发程度。

Utilizing the approximate entropy algorithm, the changes of approximate entropy of electroencephalogram （EEG） θ rhythm （Apen θ） about 19 healthy volunteers before and after 5 Hz frequency photon stimulation （light repeatedly inducing 5 times per second） are analyzed. The results of T-test（P%θ.θ5） show that the 5 Hz photon stimulation can significantly reduce the Apen θ of EEG θ rhythm. These changes can be obviously observed at the forehead, parietal, temporal and occipital region, and the most significant changes happen at temporal region and occipital region. The average Apen θ values about left and right brain EEG are both reduced after photon stimulation, and the Apen θ about right brain EEG is reduced more obviously. It can be concluded that Apen θ induced by external optical stimuli can describe different EEG rhythm characteristics and quantitatively show the extent of photon stimulation.