Power spectral performance analysis of EEG during emotional auditory experiment

In this paper, we describe our investigation to explore cortical oscillation properties in the emotional auditory experiment by analyzing the significant effects of the power spectrum. We have collected the 18 channel EEG signals over 30 subjects (males) under the standard IADS affective sounds as the stimuli. These affective sound clips are classified in three emotional states, happy, neutral and fear. Power spectrum were calculated from the four frequency bands namely theta (4-8 Hz), alpha (8-13 Hz), beta (13-30 Hz) and gamma (30-50 Hz). In order to discover significant effects, a significance level of p <; 0.01 is combined with the power spectrum to analyse the data. Repeated measures ANOVA with Bonferoni correction were employed to analysis. The results showed only three bands have the significant relations between power and emotion. High alpha band between 10.86 and 12.15 Hz showed differences with significant effects in the prefrontal, central, temporal and parietal regions. Power differences of beta band between 13.72 and 29.6 Hz were found in the all cerebral areas except prefrontal region. In addition, the gamma band has one narrow band between 30.16 and 38.6 Hz with power differences in the frontal and central regions, and another narrow band between 40 and 46.75 Hz in the parietal and occipital regions. Interaction between emotional states and cerebral regions revealed that all cerebral areas had an important role, especially right medial frontal, right central and left temporal regions.