The impact of facial expressions
According to the facial feedback hypothesis, facial expressions aren't simply caused by emotions—they can influence our emotions as well. Smiling more frequently over a period of time can, in fact, make you feel happier.
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"CNX Psychology, Psychology. July 28, 2015."
http://cnx.org/contents/4abf04bf-93a0-45c3-9cbc-2cefd46e68cc@4.100:58/Psychology
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