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You know that smile you make when someone pulls out a camera? “Okay, smile!” You move your mouth into position. The photo gets taken. Done. But compare that to what happens when something genuinely makes you laugh. Your whole face can change. That difference has fascinated researchers for more than a century and eventually gave us the term Duchenne smile—a smile involving both the muscles that pull the corners of the mouth upward and muscles that raise the cheeks and constrict the area around the eyes. And people seem to notice the difference. Research comparing Duchenne and non-Duchenne smiles has found that people generally perceive Duchenne smiles more positively—including as more genuine and trustworthy. Some experimental research has even found that statements accompanied by Duchenne smiles can be perceived as more credible than the same statements paired with other expressions. But here’s where the science gets more interesting. “Duchenne smile = genuine happiness” isn’t a perfect rule. More recent research suggests that people can deliberately produce Duchenne smiles, and these smiles can occur in situations that don’t involve genuine happiness. Eye constriction may also partly reflect the intensity of the smile, rather than functioning as a unique window into someone’s true emotional state. So perhaps the better lesson isn’t: “Look at someone’s eyes and you’ll know if they’re faking.” Human emotion isn’t that easy to decode. Instead, certain configurations of a smile can change the way other people perceive us—including how genuine, positive, and trustworthy we appear. And that makes something as ordinary as smiling a fascinating example of how much information we think we’re getting from another person’s face. Try the experiment yourself. Smile just with your mouth. Then think of something that genuinely makes you happy and let yourself smile naturally. Did you notice a difference? #BodyLanguage #psychologyfacts #fakesmile #research #communicationskills