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Study: Never trust a person's face
The research group analyzed some of those technologies and, Martinez said, largely found them lacking. "Some claim they can detect whether someone is guilty of a crime or not, or whether a student is paying attention in class, or whether a customer is satisfied after a purchase," he said."
What our research showed is that those claims are complete baloney. There's no way you can determine those things. And worse, it can be dangerous," he added. After analysing data about facial expressions and emotion, the research team concluded that it takes more than expressions to correctly detect emotion.
"What we showed is that when you experience emotion, your brain releases peptides - mostly hormones - that change the blood flow and blood composition, and because the face is inundated with these peptides, it changes colour," Martinez said. According to the researchers, facial colour, for example, can help provide clues. In one experiment, the researchers showed study participants a picture cropped to display just a man's face. The man's mouth is open in an apparent scream; his face is bright red.
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