Botulin injections in the facial muscles, which relax expression lines and make one’s skin appear younger as a result of a mild paralysis, have another, not easily predictable effect: they undermine the ability to understand the facial expressions of other people. This consequence, as SISSA scientists explain in a new research study, depends on a temporary block of proprioceptive feedback, a process that helps us understand other people’s emotions by reproducing them on our own bodies.
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