Institute of Physiology, Siberian Branch of the Russian Academy of Medical Sciences, Novosibirsk, Russia.
Int J Psychophysiol. 2012 Nov;86(2):173-81. doi: 10.1016/j.ijpsycho.2012.09.002. Epub 2012 Sep 14.
The default mode network (DMN) has been mostly investigated using positron emission tomography and functional magnetic resonance imaging (fMRI) and has received mixed support in electroencephalographic (EEG) studies. In this study, after sLORETA transformation of EEG data, we applied group spatial independent component analysis which is routinely used in fMRI research. In three large and diverse samples coming from two different cultures (Russian and Taiwanese), spontaneous EEG data and retrospective questionnaire measures of subject's state, thoughts, and feelings during the EEG registration were collected. Regression analyses showed that appearance of spontaneous self-referential thoughts was best predicted by enhanced alpha activity within the DMN. Diminished theta and delta activity in the superior frontal gyrus and enhanced beta activity in the postcentral gyrus added to the prediction. The enhanced alpha activity prevailed in the posterior DMN hub in Russian, but in the anterior DMN hub in Taiwanese participants. Possible cross-cultural differences in personality and attitudes underlying this difference are discussed.
静息态默认模式网络（DMN）主要通过正电子发射断层扫描和功能磁共振成像（fMRI）进行研究，在脑电图（EEG）研究中得到的支持不一。在这项研究中，我们对 EEG 数据进行了 sLORETA 转换，然后应用了组空间独立成分分析，这种方法常用于 fMRI 研究。在三个来自不同文化（俄罗斯和中国台湾）的大型且多样化的样本中，我们收集了 EEG 记录期间受试者状态、思维和感受的自发 EEG 数据和回顾性问卷调查数据。回归分析表明，自发自我参照思维的出现可以通过 DMN 内增强的 alpha 活动来最好地预测。在额上回中theta 和 delta 活动减少，中央后回中 beta 活动增强，有助于预测。在俄罗斯参与者中，增强的 alpha 活动主要出现在 DMN 的后核心区域，而在中国台湾参与者中则出现在 DMN 的前核心区域。讨论了这种差异背后可能存在的跨文化人格和态度差异。
