Muscle patterns that show satisfaction or delight
as opposed to a disingenuous smirk
have been identified by the Laboratory of Human Interaction
to provide more information about suicidal patients
who want to check themselves out of hospital
in order to take their own lives.
The best test for a genuine smile
is to look at the eyebrow and watch for skin droop.
The skin under the eyebrow is lowered only in genuine smiles.
Unhappy feelings show through false smiles
for about one third of a second
in what we term ‘leakage’.
