小波相干分析及其在听觉与震动刺激事件相关电位处理中的应用

尝试将小波相干方法应用于事件相关电位实验的脑电信号分析中。实验分为三组：听觉任务、震动任务1和震动任务2。对12个受试者的实验数据进行40Hz左右的小波相干分析，计算了前额脑区与其他各脑区之间的相干性，发现震动任务的小波相干值大于听觉任务并有显著差异，且在不同的任务中，各脑区的小波相干值有其明显不同的分布特征，且随时间呈有规律的变化。分析体现了小波相干在短时脑电信号处理上的优势。

Wavelet Coherence and Its Application in Analyzing Auditory and Motor Task Event-related Potentials

Wavelet coherence method is applied in analyzing single trial of ERP (event-related potential). There are three groups of experiments: auditory single task, motor single task 1 and motor single task 2. Data from 12 participants is analyzed around 40 Hz by wavelet coherence method and the coherence values between prefrontal area and other areas in the brain are calculated. It is found that the coherence values in motor tasks are larger than those in auditory task and there are significantly differences. Furthermore, in different tasks, the distributions of the coherence values are obviously different, and the values are changing in particularly ways according the varying of the time. This analysis indicates that wavelet coherence method has its advantages in investigating short time EEG signals.