Time-dependent cortical asymmetries induced by emotional arousal: EEG analysis of event-related synchronization and desynchronization in individually defined frequency bands
Time-dependent cortical asymmetries induced by emotional arousal: EEG analysis of event-related synchronization and desynchronization in individually defined frequency bands
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DOI：
10.1016/s0167-8760(01)00194-5
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发表时间：
2002-04-01
影响因子：
3
通讯作者：
Reva, NV
中科院分区：
文献类型：
--
作者：
Aftanas, LI;Varlamov, AA;Reva, NV
在20名健康受试者中，测量了低、中、高唤醒（LA、MA和HA）含量的国际情感图片系统（IAPS）刺激在θ、α-1、α-2和α-3频段的事件相关去同步化（ERD）和同步化（ERS）。62通道脑电图，皮肤电反应（SCR）和心率（HR）同时记录，而受试者观看顺序呈现的图片，并主观评价后，每个演示。在θ频段，MA和HA与LA刺激诱导了左前和双侧后皮质导联的更大同步。然而，出乎意料的是，MA和HA与LA刺激都产生了更大的α-1同步，主要是在枕骨导联上。在θ和α-1波段，情感上突出的刺激，促使较大的ERS的整体优势的背景下，功率同步的后区的右半球，无论刺激类别。最后，在α-3波段，HA刺激诱导左半球前导联的偏侧化时间依赖性功率增加。在效价维度以外的情感分析中，大脑半球的不对称性不仅表明右半球的后部区域（θ和α-1带），而且还表明左半球的前部区域（θ和α-3带）。在情感计时方面，显著的唤醒X时间相互作用清楚地表明，在θ频带中，情感刺激的辨别已经在刺激后200 ms开始，而在α-1和α-3频带中，该过程被延迟高达800-1200 ms（C）2002 Elsevier Science B. V.保留所有权利。
Event-related desynchronization (ERD) and synchronization (ERS) in the individually defined theta, alpha-1, alpha-2 and alpha-3 frequency bands were measured in 20 healthy subjects in response to International Affective Picture System (IAPS) stimuli with low, moderate and high arousal (LA, MA and HA) content. The 62-channel EEG, skin conductance response (SCR) and heart rate (HR) were simultaneously recorded while subjects viewed sequentially presented pictures and subjectively rated them after each presentation. In the theta band, both MA and HA vs. LA stimuli induced larger synchronization over the left anterior and bilaterally over posterior cortical leads. However, rather unexpectedly, both MA and HA vs. LA stimuli yielded larger alpha-1 synchronization, predominantly over occipital leads. In both theta and alpha-1 bands, affectively salient stimuli prompted larger ERS against the background of the overall dominance in power synchronization of posterior regions of the right hemisphere, irrespective of stimulus category. Finally, in the alpha-3 band, HA stimuli induce a lateralized time-dependent power increase over anterior leads of the left hemisphere. The hemispheric asymmetries revealed point to recruitment of not only posterior regions of the right hemisphere (theta and alpha-1 bands), but also of anterior regions of the left hemisphere (theta and alpha-3 bands) in affect analysis beyond valence dimension. In terms of affective chronometry, the significant arousal X time interactions clearly indicate that in the theta frequency band discrimination of affective stimuli has already started at 200 ms post-stimulus, whereas in the alpha-l and alpha-3 bands this process is delayed by up to 800-1200 ms. (C) 2002 Elsevier Science B.V. All rights reserved.