基于1.5维谱的脑电非线性相位耦合分析

Nonlinear Phase Coupling Analysis of the EEG Based on 1.5-Dimension Spectrum

应用随机信号的1.5维谱分析脑电信号,旨在克服脑电功率谱分析的缺陷,同时保留高阶谱分析的优良特性。对五种不同思维状态(放松、启发式写信、两位数乘、数字擦除重绘、三维旋转)下的脑电进行1.5维谱分析,并对分析结果作了初步的讨论。分析显示,所有脑电均出现明显的平方相位耦合结构,但在不同思维状态下的脑电平方相位结构存在明显的差异,结果表明相位耦合信息可能为研究脑电提供新的途径。

For overcoming defect of power spectrum which provides no phase information and taking advantage of good characteristics of higher order spectra, the paper deals with five typical mental tasks of the EEG （Electroencephalogram）, which are considered to be non-Gaussian random processes, with 1.5-dimension spectrum and the rudimentary results are also presented. It shows that quadratic phase coupling occurs on all mental tasks diseribed although differences exist. The proposed method also indicates a new way to the EEG study.