Extraversion and anterior vs. posterior DMN activity during self-referential thoughts.
Extraversion and anterior vs. posterior DMN activity during self-referential thoughts.
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DOI：
10.3389/fnhum.2012.00348
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发表时间：
2012
影响因子：
2.9
通讯作者：
Knyazev GG
中科院分区：
文献类型：
--
作者：
Knyazev GG
近年来的研究表明，脑电（EEG）的额-后部频谱功率分布与人格有关。具体而言，外倾性与后皮质区域中与后默认模式网络（DMN）中心重叠的频谱功率增加以及前区域中与前DMN中心重叠的频谱功率减少相关。虽然有证据表明，多巴胺能神经传递可能参与，心理过程，这些协会的基础仍然不清楚。我假设这些过程可能与自发的自我参照思想有关。具体来说，我假设，在外向者自我参照的想法可能与增加频谱功率在后DMN枢纽，而在内向者，他们可能与频谱功率在前DMN枢纽的增加。自发EEG登记后，参与者被要求填写一份问卷，描述他们在登记期间的想法。描述自我参照积极期望（SRPE）的项目被用来衡量这些过程的强度的个体差异。源定位和独立成分分析应用于EEG数据，以揭示与前部和后部DMN枢纽相关的振荡活动。分层回归分析显示，在预测SRPE评分的个体差异方面，外倾性评分和前后DMN α活性之间存在显著的相互作用。在外向者中，高SRPE分数与后DMN中枢的α功率增加相关，而在内向者中，它们与前DMN中枢的α功率增加相关。结果进行了讨论的差异参与的两个DMN枢纽在自我相关的奖励过程中，外向和内向。
Recent studies show that fronto-posterior electroencephalogram (EEG) spectral power distribution is associated with personality. Specifically, extraversion is associated with an increase of spectral power in posterior cortical regions that overlap with the posterior default mode network (DMN) hub and a decrease of spectral power in anterior regions that overlap with the anterior DMN hub. Although there is evidence that dopaminergic neurotransmission may be involved, psychological processes that underlie these associations remain unclear. I hypothesize that these processes may have something to do with spontaneous self-referential thoughts. Specifically, I hypothesize that in extraverts self-referential thoughts may be associated with an increase of spectral power in the posterior DMN hub, whereas in introverts they may be associated with an increase of spectral power in the anterior DMN hub. After spontaneous EEG registration, participants were asked to fill in a questionnaire describing their thoughts during the registration. An item describing self-referential positive expectations (SRPE) was used to measure individual differences in the intensity of these processes. Source localization and independent component analyses were applied to EEG data to reveal oscillatory activity associated with the anterior and the posterior DMN hubs. Hierarchical regression analysis showed a significant interaction between extraversion scores and anterior vs. posterior DMN alpha activity in predicting individual differences in SRPE scores. In extraverts, high SRPE scores were associated with an increase of alpha power in the posterior DMN hub, whereas in introverts they were associated with an increase of alpha power in the anterior DMN hub. Results are discussed in terms of differential involvement of the two DMN hubs in self-related reward processes in extraverts and introverts.