The default mode network and EEG alpha oscillations: An independent component analysis
The default mode network and EEG alpha oscillations: An independent component analysis
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DOI：
10.1016/j.brainres.2011.05.052
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发表时间：
2011-07-21
期刊：
影响因子：
2.9
通讯作者：
Pylkova, Liudmila V.
中科院分区：
文献类型：
--
作者：
Knyazev, Gennady G.;Slobodskoj-Plusnin, Jaroslav Y.;Pylkova, Liudmila V.
默认模式网络（DMN）主要使用正电子发射断层扫描（PET）和功能性磁共振成像（fMRI）进行研究，并在脑电图（EEG）研究中得到了混合支持。特别是，现有的证据是太不一致，允许制定具体的假设联系DMN活动，传统的EEG频段。在这项研究中，我们的目的是测试盲分解方法是否能够识别EEG数据的空间模式类似的DMN，因为它是在PET和fMRI研究中描述。此外，我们的目的是测试在传统的EEG频带中识别的DMN模式的任务相关性的程度。为了回答这些问题，我们收集了在休息状态下和在两个实验任务：一个明确的判断面部影响和社会游戏任务的性能数据。在休息状态下的自我指涉的想法量的个体差异进行了测量的简短的自我报告量表。只有α波段的空间模式，同时表现出相当大的重叠与DMN和高相关性与假定DMN功能相关的结果，无论是在休息状态和社会游戏任务。自发的自我参照的想法与增强的α活动在后DMN枢纽，而DMN功能相关的外部刺激的处理破坏了这种活动，同时造成部分α锁相外部事件。这一证据表明，与外部刺激的处理相反，内部心理过程的同步可能是阿尔法振荡的主要功能，这必然与DMN的活动有关。(C)2011爱思唯尔有限公司版权所有。
The default mode network (DMN) has been principally investigated using positron emission tomography (PET) and functional magnetic resonance imaging (fMRI) and has received mixed support in electroencephalographic (EEG) studies. In particular, the existing evidence is too inconsistent to allow formulation of specific hypotheses linking DMN activity to traditional EEG frequency bands. In this study, we aimed to test whether blind decomposition methods are able to identify in EEG data spatial patterns resembling the DMN as it is described in PET and fMRI studies. Further we aimed to test a degree of task-relatedness of DMN patterns identified in the traditional EEG frequency bands. To answer these questions we collected data both in a resting state and during performance of two experimental tasks: an explicit judgment of facial affect and a social game task. Individual differences in amount of self-referential thoughts during the resting state were measured by a short self-report scale. Only alpha band spatial patterns simultaneously showed a considerable overlap with the DMN and high correlations with presumptive DMN function-related outcomes both in the resting state and during the social game task. Spontaneous self-referential thoughts were associated with enhanced alpha activity in the posterior DMN hub, whereas processing of DMN function-related external stimuli disrupted this activity and simultaneously caused partial alpha phase-locking to external events. This evidence implies that synchronization of internal mental processes, as opposed to the processing of external stimuli, might be the primary function of alpha oscillations which is bound to be related to activity of the DMN. (C) 2011 Elsevier B.V. All rights reserved.