PMID: 11912870Mar 27, 2002Paper

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

The International Journal of Neuroscience
L I AftanasN V Reva

Abstract

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 post-stimulus, 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 hemisp...Continue Reading

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Citations

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