Emotional effects. (A) Grand average ERPs for surprise, disgust, fear and sadness at the right occipital electrode (O2). An overall emotional effect was found on amplitude of this early visual component. For example, P1 evoked by surprised faces was smaller than P1 recorded for disgusted, sad and fearful faces. (B) Grand average ERP for surprise, disgust, fear and sadness from a left temporo-occipital electrode (T5). An overall effect of emotion was found on N170 latency. For example, N170 evoked by fearful faces was later than the component registered for surprised faces.