Comparison of different spatial transformations applied to EEG data: A case study of error processing
Comparison of different spatial transformations applied to EEG data: A case study of error processing
复制标题
DOI：
10.1016/j.ijpsycho.2014.09.013
复制
发表时间：
2015-09-01
影响因子：
3
通讯作者：
Cohen, Michael X.
中科院分区：
文献类型：
--
作者：
Cohen, Michael X.
本文的目的是比较不同的空间变换应用于相同的头皮记录的脑电数据的效果。所应用的空间变换是两种参考方案(平均和链接耳垂)、表面拉普拉斯和波束形成(一种分布式源定位过程)。脑电数据是在一项加速的反应时间任务中收集的，该任务提供了错误和正确反应之间的活动比较。分析集中在时频功率、特定频段的电极间连通性以及受试者内部脑电活动和反应时间之间的交叉试验相关性。时频功率分析显示，在所有空间变换中，与正确反应相比，错误的额叶中段Delta-theta功率模式相似。此外，波束成形还显示了错误相关的前额叶和外侧前额叶β带活动。受试者内部的大脑-行为相关性在空间转换中显示出类似的结果模式，在波束形成后相关性最弱。空间转换中最显著的差异是在连接性分析中：关联耳垂参考产生的站点间连接性较弱，这可归因于体积传导(零相位滞后)，而平均参考和拉普拉斯参考产生更可解释的连接性结果。波束成形没有显示出任何显著的连通性条件调制。总体而言，这些分析表明，一些发现对空间转换是稳健的，而其他发现，特别是涉及交叉试验分析或连通性的那些，则更为敏感，可能取决于使用适当的空间转换。(C)2014爱思唯尔B.V.保留所有权利。
The purpose of this paper is to compare the effects of different spatial transformations applied to the same scalp-recorded EEG data. The spatial transformations applied are two referencing schemes (average and linked earlobes), the surface Laplacian, and beamforming (a distributed source localization procedure). EEG data were collected during a speeded reaction time task that provided a comparison of activity between error vs. correct responses. Analyses focused on time-frequency power, frequency band-specific inter-electrode connectivity, and within-subject cross-trial correlations between EEG activity and reaction time. Time-frequency power analyses showed similar patterns of midfrontal delta-theta power for errors compared to correct responses across all spatial transformations. Beamforming additionally revealed error-related anterior and lateral prefrontal beta-band activity. Within-subject brain-behavior correlations showed similar patterns of results across the spatial transformations, with the correlations being the weakest after beamforming. The most striking difference among the spatial transformations was seen in connectivity analyses: linked earlobe reference produced weak inter-site connectivity that was attributable to volume conduction (zero phase lag), while the average reference and Laplacian produced more interpretable connectivity results. Beamforming did not reveal any significant condition modulations of connectivity. Overall, these analyses show that some findings are robust to spatial transformations, while other findings, particularly those involving cross-trial analyses or connectivity, are more sensitive and may depend on the use of appropriate spatial transformations. (C) 2014 Elsevier B.V. All rights reserved.