脑电源的空间谱及其在视觉空间选择性注意研究中的应用

Spatial Spectra of Neural Electric Activities and Their Application in Study of Visual Spatial Selective Attention

研究了三层球模型中脑电源的空间谱和它的初步应用。以基于等效分布偶极源的球谐谱反演方法为基础 ,提出了新的纬向谱 S(l)和经向谱 S(m)作为脑电源的空间谱刻画 ,然后应用于视觉空间选择注意的诱发脑电(ERP)数据。应用研究发现 ,在纬向谱 S(l)和经向谱 S(m )的时变曲线上 ,介于 10 0～ 2 0 0 ms间的成分的延时和幅度变化能较好地反映出注意的影响 。

In this paper, the spatial spectra of neural electric activities and their primary application to visual spatial selective attention are presented. Based on the spherical harmonic spectra inversion by equivalent distributed dipole layer technique, novel latitude spectra S(l) and longitudinal spectra S(m) are defined as the description of spatial spectra of brain electric activities. When the latitude and longitudinal spectra are applied to the event related potentials (ERP) of spatial selective attention to the right and left visual fields, the temporal structures of spatial spectra of all temporal sample points show meaningful delay and amplitude differences of components between100ms and 200ms for attended and unattended stimulus conditions. These facts indicate that the latitude and longitudinal spatial spectra concept is useful in study of cognitive brain research.