双谱分析方法在脑电信号分析中的应用

Application of bispectral techniques in the analysis of EEG signals

目的使用高阶谱技术建立脑电信号的双谱分析方法 ,以探讨脑电信号中蕴涵的高阶信息。方法根据脑电信号的非高斯和非线性特征 ,建立脑电信号的双谱分析方法 ,并对闭目安静、睁眼、心算等不同脑功能状态下和精神分裂症的脑电信号进行初步分析。结果不同脑功能状态下的脑电信号均显示出明显的双谱结构 ,且存在明显的差异。结论作为脑电信号非线性定量分析的一种研究方法 ,双谱分析可显示出常规脑电分析时无法显示的有价值的高阶信息。

ObjectiveTo detect the high-order information in EEG signals by bispectral analysis based on high-order spectral techniques. MethodsAccording to the non-Gaussianilty and nonlinearity of EEG, the bispectral techniques is used to analyze EEG signals in different brain states (rest with eyes closed, rest with eyes open, computing by heart with eyes closed) and in schizophrenia. ResultsAll the EEG signals in different brain states show obvious bispectral structure, and there are differences between different brain states.ConclusionBeing a quantitative method of non-Gaussianilty and nonlinearity for EEG study, the bispectral analysis can give more useful high-order information.