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Is the startle reaction an emotion?
Ekman P, Friesen WV, Simons RC. Ekman P, et al. Among authors: friesen wv. J Pers Soc Psychol. 1985 Nov;49(5):1416-26. doi: 10.1037//0022-3514.49.5.1416. J Pers Soc Psychol. 1985. PMID: 4078682
Pan-cultural elements in facial displays of emotion.
Ekman P, Sorenson ER, Friesen WV. Ekman P, et al. Among authors: friesen wv. Science. 1969 Apr 4;164(3875):86-8. doi: 10.1126/science.164.3875.86. Science. 1969. PMID: 5773719
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