Because our facial expression send signals to our brains, the frozen muscles can interrupt that process. Women who were treated for frown lines rated themselves as feeling less sad a few weeks later. Those who got jabbed in the forehead were treated as more gullible or anti-social with the lack of eyebrow expression. The saddest of the bunch were those who had their laugh lines paralyzed. Less smiling resulted in fewer happy signals to the brain and lower levels of happiness.
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