When you become familiar with someone, you start to recognize their face pretty quickly - but if you see them upside down, it's harder to tell.Known as the (FIE), scientists have long been trying to work out whether it's an evolutionary or learned behavior.'Face processing has received a lot of research attention and it's a relatively well-developed research area, but the brain is complicated and hard to study so we still have only a dim understanding of how face processing works,' Brad Duchaine, a psychologist at Dartmouth College told DailyMail.com.
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