Leakage
Muscle patterns that show satisfaction or delightas opposed to a disingenuous smirkhave been identified by the Laboratory of Human Interactionto provide more information about suicidal patientswho want to check themselves out of hospitalin order to take their own lives. The best test for a genuine smileis 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 smilesfor about one third of a secondin what we term ‘leakage’.