When a baby smiles at you, it's almost impossible not to smile back. This spontaneous reaction to a facial expression is part of the back-and-forth that allows us to understand each other's emotions ...
New research shows facial expressions are planned by the brain before movement, not automatic emotional reactions.
Facial expression control starts in a very old part of the nervous system. In the brain stem sits the facial nucleus, which contains the motoneurons that directly control facial muscles.
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