Posterior EEG alpha at rest and during task performance: Comparison of current source density and field potential measures.
Posterior EEG alpha at rest and during task performance: Comparison of current source density and field potential measures.
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DOI：
10.1016/j.ijpsycho.2015.05.011
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发表时间：
2015-09
期刊：
影响因子：
--
通讯作者：
Bruder GE
中科院分区：
文献类型：
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作者：
Tenke CE;Kayser J;Abraham K;Alvarenga JE;Bruder GE
休息和任务相关的脑电图阿尔法用于认知和精神病理学的研究。虽然拉普拉斯方法已被应用，担心全球活动的损失劝阻研究人员从更大的使用，除了作为参考依赖的措施的补充。不幸的结果是继续依赖于不同实验室的参考策略，以及系统性地偏好蒙太奇依赖的平均参考而不是真正的无参考测量。我们解决了这些问题，通过比较休息和任务相关的脑电图α使用三个EEG转换：鼻子（NR）和平均参考（AR）EEG，以及相应的CSD。静息和刺激前任务相关EEG（新奇古怪）和事件相关频谱扰动的幅度谱被缩放到等同于每个变换。8-12 Hz频段量化的α测量值为：1）净振幅（闭眼减去睁眼）和2）总振幅（闭眼加睁眼）; 3）任务振幅（刺激前基线）和4）任务事件相关去兴奋（ERD）。平均地形明确表示后α整体，净和任务，以及刺激后α ERD。地形相似的三个转换，但不同的分散，CSD是最尖锐的和NR最广泛的分布。变换在尺度上也不同，AR在前部部位显示较少的衰减或伪次级最大值，与分布式后验发生器的模拟一致。后验任务α和α ERD与总体α呈正相关，但与净α无关。CSD地形图一致且适当地代表了所有测量的后验EEG α。
Resting and task-related EEG alpha are used in studies of cognition and psychopathogy. Although Laplacian methods have been applied, apprehensions about loss of global activity dissuade researchers from greater use except as a supplement to reference-dependent measures. The unfortunate result has been continued reliance on reference strategies that differ across labs, and a systemic preference for a montage-dependent average reference over true reference-free measures. We addressed these concerns by comparing resting- and task-related EEG alpha using three EEG transformations: nose- (NR) and average-referenced (AR) EEG, and the corresponding CSD. Amplitude spectra of resting and prestimulus task-related EEG (novelty oddball) and event-related spectral perturbations were scaled to equate each transformation. Alpha measures quantified for 8-12 Hz bands were: 1) net amplitude (eyes-closed minus eyes-open) and 2) overall amplitude (eyes-closed plus eyes-open); 3) task amplitude (prestimulus baseline) and 4) task event-related desynchronization (ERD). Mean topographies unambiguously represented posterior alpha for overall, net and task, as well as poststimulus alpha ERD. Topographies were similar for the three transformations, but differed in dispersion, CSD being sharpest and NR most broadly distributed. Transformations also differed in scale, AR showing less attenuation or spurious secondary maxima at anterior sites, consistent with simulations of distributed posterior generators. Posterior task alpha and alpha ERD were positively correlated with overall alpha, but not with net alpha. CSD topographies consistently and appropriately represented posterior EEG alpha for all measures.