Objective: Event-related potentials (ERP) temporal sequences of social sadness and pleasure were investigated to explore whether social affective items could cause negativity bias.Methods: When 16 healthy undergraduates watched social sad, neutral, and pleasant pictures, EEG data were collected and averaged by the emotion valences. Peaklatencies, amplitudes and cortex locations of P2 and N2 were measured. Results: Compared with pleasant emotions, the peak latencies of social sadness P2 shortened from 177.9 ms to 166.8 ms, and the amplitudes of N2 increased from -3.4 to-4.2 μV. The amplitudes of P2 and N2 both showed right hemisphere advantages, the P2 in left and right hemispheres were 4.2 and 5.2 μV, and N2 were -3.1 and -3.7 μV, respectively. Conclusion: Social emotions bring negativity bias,and have right hemisphere advantages.
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