How facial muscle contractions reveal emotional high-stakes lies
Researchers from the University of British Columbia have unlocked a secret code written on everyone’s face which reveals when people are lying.
Scientists have discovered for the first time, five tell-tale muscle groups that control facial expressions, activate differently when we are trying to deceive.
They based their study on more than 23,000 frames of television footage from 52 people emotionally pleading to the public for the return of a missing relative – half of whom were eventually convicted of murdering that person.
The first study of its kind to focus on so-called “high-stakes” emotional deception, discovered that even the most convincing of actors cannot control their facial muscles.
The paper – called Darwin the Detective: Observable Facial Muscle Contractions Reveal Emotional High-Stakes Lies – looked for emotional “leakage”, particularly via those facial muscles which are harder to control – particularly during stressful events or when great concentration is required to maintain a lie.
“Specifically, the <<grief>> muscles, the corrugator supercilli – located around the eyebrow – and depressor anguli oris – between the chin and corner of the lips – were more often contracted in the faces of <<genuine>> rather than <<deceptive pleaders>>,” researchers from the University of British Columbia found.
Researchers found subtle contraction of the zygomatic major – which runs from cheekbone to the mouth – activated during masking smiles, and full contraction of the frontalis – the brow – which flexed during failed attempts to appear sad, “were more commonly identified in the faces of deceptive pleaders”.
The study said: “During the critical lie, told by each deceptive murderer, upper face surprise and lower face happiness were likely to be expressed, attributed to the failed attempt to appear sad and leakage of happiness.
“Deception – a fundamental aspect of human communication – often is accompanied by the simulation of unfelt emotions or the concealment of genuine emotions to correspond to the false message…
“Given limited cognitive resources and the difficulty of necessary multi-tasking during deception, we suggest that emotional leakage is particularly likely to occur when the lie is complex and/or associated with strong emotions to be concealed or falsified.”
The study concluded “findings support the notion that the human face is indelibly stamped with the tale of our humble origin and attempts to mask our emotions are likely to fail when engaging in a consequential act of deception”.
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