Baby Face -- Harvard Experts Hope Facial Recognition Studies Benefit Autism Research

"If they tell you how much they loved your gift and if the smile is missing the contraction of the sphincter muscle around the eye -- the crow's-feet wrinkles -- the person probably wasn't so keen on your gift," said Cohn.

Cohn uses a method called Facial Action Coding System [FACS] developed by famous researcher Paul Ekman to train students to detect such signals. But Cohn warned it isn't something that can be picked up in a day.

"It is something that can be learned," said Cohn. "When we train people in the lab, typically it would take a semester."

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