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ERP studies of 6 basic emotions. (a) Topological distribution of ERP recordings at P1 shows that fear, joy, and disgust have the strongest P1 response at Pz points. (b) Valence and arousal distributions of the 6 categorized pictures showed that sadness and disgust overlapped, surprise and joy overlapped, and fear and anger overlapped. (c) Statistical analysis of valence and arousal showed that disgust and sadness have similar negative valence; fear and anger have similar arousal.
