Poster E18, Monday, March 27, 2:30 – 4:30 pm, Pacific Concourse
EEG frontal alpha power asymmetry can evaluate temporal dynamics of our emotion
Motoyuki Sanada1, Kohei Fuseda1, Jun'ichi Katayama1,2; 1Department of Integrated Psychological Sciences, Kwansei Gakuin University, 2Center for Applied Psychological Science (CAPS)
Current study investigated the temporal dynamics of physiological index corresponding to human emotion. It has been known that the asymmetry of frontal alpha power of the electroencephalogram (EEG) reflects our affective/motivational state: left and right high power reflects withdrawal and approach motivation, respectively (Davidson et al., 1990). In most studies, the alpha power has been calculated by the Fast Fourier Transform (FFT) analysis, thus the temporal information of the state has to be discarded. Our emotional state, however, varies over time, so the method to evaluate the temporal aspect of our emotional state must be very useful. We extracted alpha power by band-pass filter from EEG data in two frontal channels (F3 and F4), which were collected from 12 participants while they were watching two sad movie clips (7 min each). Our results showed (1) that asymmetric patterns of the alpha power derived by the filter method were highly correlated with that calculated by FFT, when they were averaged during whole movie length., (2) the asymmetric patterns of the filtered alpha power changed according to the transitions of the film scenes. These results indicate application potency of this method to assess temporal dynamics of the EEG index of our emotion.
Topic Area: EMOTION & SOCIAL: Emotional responding