The effects of arousal and valence on facial electromyographic asymmetry during blocked picture viewing

►Left hemi-face dominance for corrugator activity during high and low arousal negative emotion blocks. ►Right hemi-face dominance for zygomaticus activity during the high arousal positive emotion blocks. ►The results provided some support for the valence hypothesis. ►The emotion stimulus arousal qualified facial EMG asymmetry in response to positive emotional stimuli whereas no such effect was evident for facial EMG asymmetry in response to negative emotional stimuli.