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’.