Itâ??s a version of the classic finding in psychology that facial expressions can produce the very emotion they usually reflect. Called the facial feedback hypothesis, it implies that forcing your lips and cheeks into a smile can make you feel happy and scowling can make you feel annoyed, at least a little. Building on that research, graduate student David Havas of the University of Wisconsin-Madison decided to study people who had received Botox treatments that paralyzed one pair of their corrugator muscles, which cause the forehead to constrict into a frown.
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