刺激前后脑电α波相位重排现象研究

对8个被试在视听觉同步刺激模式下采集的脑电数据，选择O1电极探讨刺激前后，从自发脑电到诱发脑电过程中α波(8～13 Hz)相位重排现象。计算每次刺激前的幅度(Pr)、相位(φ)，和刺激后的第一个正(P)波和第一个负(N)波的潜伏期与幅度共6个参数。提出了Pr和P、N波幅度之间的3次多项式模型；采用线性回归中异常值检验法量化相位重排的程度，结果表明：从自发脑电到诱发脑电的过程中，α波的相位存在明显的重排现象。

The phase resetting from pre-stimulus to post-stimulus alpha wave (8~13 Hz) in eight healthy subjects is studied. The six parameters of single trail alpha wave are computed and analyzed: pre-stimulus amplitude and phase angle, post-stimulus amplitude and latency of first positive and negative peak. The amplitude relationship between pre- and two post-stimuli can be described by a cubic polynomial model. By using the method of outlying cases test in linear regression, we can quantitatively analyze the degree of phase resetting. The results demonstrate that there is partial phase resetting from pre- to post-stimuli in the band of alpha wave.