McMaster Integrative Neuroscience Discovery and Study, McMaster University, Hamilton, Ontario L8S 4K1, Canada.
Biol Psychol. 2010 Feb;83(2):125-32. doi: 10.1016/j.biopsycho.2009.11.010. Epub 2009 Nov 27.
Increasing evidence suggests that cross-frequency spectral coupling between slow (SW) and fast (FW) wave activity in the EEG supports information exchange between separate and functionally distinct neural systems. Further, evidence suggests that states of uncertainty, anticipation and anxious apprehension involve a high degree of SW-FW coupling. We examined whether adults pre-selected for high and low social anxiety showed distinct patterns of frontal brain oscillatory coupling during resting baseline and the anticipation of a self-presentation task. As predicted, the high socially anxious group showed significantly greater SW-FW coupling than the low socially anxious group, in the right, but not left, frontal electrode sites while anticipating a public speaking task. Additionally, the low socially anxious group showed a decrease in delta power from baseline to speech anticipation, suggesting that they found the same task potentially rewarding. Exploratory analyses indicated no effects of delta-gamma coupling. However, EEG gamma band power increased during the speech anticipation condition, in the parietal electrode sites. Our results are discussed in the context of previous studies on cross-frequency EEG coupling in relation to individual differences in motivation and emotion and future directions for studying the neural correlates of anxiety.
越来越多的证据表明，脑电图中慢波 (SW) 和快波 (FW) 活动之间的频间谱耦合支持了不同的、功能上不同的神经系统之间的信息交换。此外，有证据表明，不确定、预期和焦虑的状态涉及到高度的 SW-FW 耦合。我们研究了在静息基线和自我表现任务预期期间，预先选择高社交焦虑和低社交焦虑的成年人是否表现出不同的额叶脑振荡耦合模式。正如预测的那样，高社交焦虑组在预期演讲任务时，右侧额叶电极部位的 SW-FW 耦合明显高于低社交焦虑组，而左侧则没有。此外，低社交焦虑组在从基线到演讲预期的过程中，delta 功率下降，表明他们发现同样的任务可能有回报。探索性分析表明 delta-gamma 耦合没有影响。然而，在演讲预期条件下，顶叶电极部位的 EEG 伽马波段功率增加。我们的研究结果在先前关于跨频 EEG 耦合与动机和情绪个体差异的研究背景下进行了讨论，并对研究焦虑的神经相关性的未来方向进行了探讨。
