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…it’s written all over your face, you don’t have to say a word… the Rude Boys sang it and your face may tell all.

A new study published in the journal Evolution and Human Behavior reveals that muscles in the upper face may divulge when people are not telling the truth. Researchers found four different facial muscles that a trained eye can use to separate genuine expressions of emotion from deceptive ones.

“Facial cues are an important, but often ignored, aspect of credibiity assessments where an emotional issue is in question,” says study author Dr. Leanne ten Brinke.