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Il exprime généralement le plaisir ou l'amusement, mais aussi l'ironie, et joue ainsi un rôle social important. Le cerveau humain serait capable d'isoler un sourire du reste du visage, ce qui se vérifie en observant une photo retournée verticalement où le sourire est, lui, resté dans le bon sens.
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A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. It is believed it takes about 42 muscles to smile. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a "Duchenne smile". Smiles performed without the eye contraction may be perceived as insincere. Among humans, smiling is an expression denoting pleasure, sociability, happiness, joy or amusement. It is distinct from a similar but usually involuntary expression of anxiety known as a grimace. Although cross-cultural studies have shown that smiling is a means of communication throughout the world, there are large differences among different cultures, with some using smiles to convey confusion or embarrassment.
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