LOCALIZATION OF THE SOURCES OF EEG-DELTA, EEG-THETA, EEG-ALPHA AND EEG-BETA-FREQUENCY BANDS USING THE FFT DIPOLE APPROXIMATION
LOCALIZATION OF THE SOURCES OF EEG-DELTA, EEG-THETA, EEG-ALPHA AND EEG-BETA-FREQUENCY BANDS USING THE FFT DIPOLE APPROXIMATION
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DOI：
10.1016/0013-4694(92)90180-p
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发表时间：
1992-01-01
期刊：
影响因子：
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通讯作者：
BRANDEIS, D
中科院分区：
文献类型：
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作者：
MICHEL, CM;LEHMANN, D;BRANDEIS, D
采用FFT偶极近似法和三维偶极模型确定13名正常人静息时δ、θ、α、β -1和β -2频段等效偶极模型源的位置。从每个受试者中，分析2个连续的数据集，每个数据集由30分钟内随机收集的10个2秒的时间段组成。方差分析显示，不同被试的脑电图频带源位置在纵向和前后维度上存在显著差异。数据集2的结果证实了数据集1的结果。δ的来源最深，最前面，θ的来源更后，更不深，α的来源最后，在垂直维度上最高，β -1的来源比β -1的来源更深，比α -2的来源更前，比α -1的来源更深。因此，震源定位深度与时间频率没有线性关系。5个波段的辐射源均向矢状方向分布，δ平均场的梯度较陡，α和-1的梯度较陡。任何频率的功率图都可以用一个相位角很好地描述。结果表明，在给定的脑电信号历元内，不同的脑电信号频带是由大脑不同位置的神经群产生的。
FFT dipole approximation and 3-dimensional dipole modelling were used to determine the locations of the equivalent dipole model sources of the delta, theta, alpha, beta-1 and beta-2 frequency bands in 13 normal subjects during resting. From each subject, 2 successive data sets were analysed, each consisting of 10 epochs of 2 sec randomly collected during 30 min. ANOVAs showed that over subjects, the source locations of EEG frequency bands differed significantly in the vertical and antero-posterior dimensions. Results of data set 2 confirmed those of data set 1. The source of delta was deepest and most anterior, theta more posterior and less deep, alpha most posterior and highest on the vertical dimension, beta-1 deeper and slightly more anterior than alpha, and beta-2 again more anterior and deeper than beta-1. Thus, the depth of source location was not linearly related to temporal frequency. The sources of all 5 bands were oriented in the sagittal direction: delta mean fields had steeper gradients anteriorly, alpha and beta-1 posteriorly. The power map for any frequency was well described by a single phase angle. The results indicate that the different EEG frequency bands during a given EEG epoch are generated by neural populations in different brain locations.