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头皮脑电时间序列的相关性是大脑皮层源的相位同步性的一种体现,因此对相位同步源进行定位,同时找到源对应的时间序列在脑成像研究领域具有重要意义.基于Rssler模型提出仿真相位同步偶极子源的时间序列的方法,利用时间序列进行同心四层球头模型正演,获得仿真头皮脑电数据.提出了基于最大似然因子分析的相位同步脑电源的时-空动力学分析方法,对仿真和真实头皮脑电数据进行了验证,并与主成分分析法进行对比.仿真实验结果表明:最大似然因子分析法估计的时间序列与仿真源的时间序列具有更高的相关系数,同时估计源与仿真源的位置误差更小,并且对空间分辨率和噪声的鲁棒性强.空间选择性注意实验的脑电数据分析结果也显示因子分析法能获得具有生理意义的时间序列和空间分布.
Scalp EEG time series correlation is a manifestation of the phase synchronization of cerebral cortex source, so positioning the phase synchronization source and finding the corresponding time series of source is of great significance in the field of brain imaging research.Based on the Rössler model The method of simulating the time series of the phase synchronization dipole source is proposed, and the concentric four-layer spherical model forward is obtained by using the time series to obtain the simulated scalp EEG data. A time-frequency analysis method based on the maximum likelihood factor analysis The results of simulation experiments show that the time series estimated by the maximum likelihood factor analysis method is more effective than the time series of the simulation source High correlation coefficient and less error in position estimation between source and simulation source, and strong robustness to spatial resolution and noise.Sollective analysis of EEG data also shows that factor analysis can obtain a good response Meaning of the time series and spatial distribution.