[Differences in the the EEG frequency characteristics during the perception of positive-emotional, negative-emotional...

Power spectral analysis of the theta- and alpha-rhythms was performed in narrow frequency bands (1 Hz) for EEGs recorded from F3, F4, C3, C4, T3, T4, P3, P4, O1, and O2 derivations in 9 healthy adults viewing emotionally positive, negative, and neutral words displayed on the screen. The relative spectral power in the 7-8 Hz band was higher during presentation of the emotionally significant words than the neutral ones. The EEG reaction to emotional words within this frequency range depended on the word valency. The relative power increase was revealed in the range of 7-7.5 Hz during presentation of emotionally positive stimuli. This reaction was most expressed in the frontal, central, and temporal cortical areas. During presentation of the negative words similar EEG reactions were observed within 7.5-8 Hz. In this case the frequency changes dominated in symmetrical frontal, right central, temporal, and parietal cortical areas.