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Measuring Affective Sharing between Two People by EEG Hyperscanning

Empathy plays an important role in human social interaction such as promoting stronger relationships and collaboration. In this study, we measured affective sharing, one of the main components of empathy, from EEG signals. To elicit affective sharing, we conducted an experiment in which participants communicated using facial expressions of joy, sadness, and neutrality. EEG signals were simultaneously recorded from both participants during the experiment. The result showed the correlations of the EEG powers were significantly higher under the joy and sadness conditions in the alpha-mu band. This result demonstrates that it is possible to measure affective sharing in response to emotional faces from the correlation of EEG powers. To our knowledge, this is the first EEG hyperscanning study that investigates affective sharing in response to emotional faces.