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Facial expressions of happiness, fear, anger, and suffering can be reduced to the shapes of eyes and mouths. As suggested in [1, 2], the perceived emotions in facial expressions involve processing by the amygdala.
Contributed by: Luca Zammataro (June 2007)
Open content licensed under CC BY-NC-SA
 R. Adolphs, D. Tranel, and A. Damasio, "The Human Amygdala in Social Judgment," Nature 393, 1998 pp. 470–474.
 P. Vuilleumier, "Staring Fear in the Face" Nature 433, 2005 pp. 22–23.
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Published: June 27 2007