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A genuine smile and a fake smile may look similar, but your brain is surprisingly good at telling the difference. A real smile usually involves the muscles around both the mouth and the eyes, while a forced smile often affects only the mouth. Even if you can't explain why, your brain can pick up on these subtle facial cues in just a fraction of a second.
This ability helps people understand emotions and build trust during conversations. Researchers believe humans developed this skill because recognizing genuine emotions was important for survival. Your brain is constantly reading faces without you even realizing it.
© American Psychological Association