Event-related synchronization and desynchronization during affective processing: Emergence of valence-related time-dependent hemispheric asymmetries in theta and upper alpha band

被引:78
作者
Aftanas, L [1 ]
Varlamov, A [1 ]
Pavlov, S [1 ]
Makhnev, V [1 ]
Reva, N [1 ]
机构
[1] Russian Acad Med Sci, Siberian Branch, State Res Inst Physiol, Psychophsiol Lab, Novosibirsk 630117, Russia
关键词
EEG; theta and alpha oscillations; event-related desynchronization and; synchronization; emotion; valence; hemispheric asymmetry; facial EMG; heart rate;
D O I
10.3109/00207450108986547
中图分类号
Q189 [神经科学];
学科分类号
071006 [神经生物学];
摘要
Event-related desynchronization (ERD) and synchronization (ERS) in the individually defined theta, alpha-1, alpha-2, and alpha-3 frequency bands were measured in 22 healthy subjects (Ss) in response to neutral (Neut), emotionally positive (Pos), and negative (Neg) IAPS stimuli. The 62-channel EEG, facial EMG and ECG were simultaneously recorded while subjects viewed sequentially presented pictures and subjectively rated them after each presentation. The obtained findings indicate that differences induced by pictures varying in emotional valence are associated mainly with increased theta and alpha-3 synchronization activity and anterior hemispheric asymmetries. In the anterior temporal leads theta ERS revealed a significant valence by hemisphere interaction showing relatively greater right hemisphere theta ERS for Neg and left hemisphere ERS for Pos stimuli in the time window of 100-700 ms poststimulus, whereas in the alpha-3 band Neg stimuli induced lateralized time-dependent left hemisphere ERS increased in the time window of 800-1200 ms. were not observed for Neut and Pos stimuli. The obtained results along with earlier observations on EEG correlates of affective processing challenge the notion that affective anterior hemispheric asymmetries are mainly sensitive to wide alpha frequency band. Frequency and time dependence of anterior hemispheric asymmetries in emotional valence discrimination is emphasized.
引用
收藏
页码:197 / 219
页数:23
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