Smiling has been found to increase feelings of happiness. Psychologists
believe this is because the brain interprets the flexing of certain muscles
to be indicative of a particular mood. For example, the zygomatic major is
the facial muscle responsible for controlling the corners of the mouth.
When this muscle is flexed, it is thought that it triggers the neurological
response that controls emotion. Another possibility is that smiling while
around other people leads them to smile back, and the brain reads this as a
social cue to feel happy.
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