Hold on, this is no time to be hysterical
The zygomatic major, which resides in the cheek, tugs the lips upward, and the orbicularis oculi, which encircles the eye socket, squeezes the outside corners into the shape of a crow’s foot. The entire event is short — typically lasting from two-thirds of a second to four seconds — and those who witness it often respond by mirroring the action, and smiling back.
Other muscles can simulate a smile, but only the peculiar tango of the zygomatic major and the orbicularis oculi produces a genuine expression of positive emotion. Psychologists call this the “Duchenne smile,” and most consider it the sole indicator of true enjoyment. The name is a nod to French anatomist Guillaume Duchenne, who studied emotional expression by stimulating various facial muscles with electrical currents. (…)
Psychological scientists no longer study beheaded rogues — just graduate students, mainly — but they have advanced our understanding of smiles since Duchenne’s discoveries. We now know that genuine smiles may indeed reflect a “sweet soul.” The intensity of a true grin can predict marital happiness, personal well-being, and even longevity. We know that some smiles — Duchenne’s false friends — do not reflect enjoyment at all, but rather a wide range of emotions, including embarrassment, deceit, and grief. We know that variables (age, gender, culture, and social setting, among them) influence the frequency and character of a grin, and what purpose smiles play in the broader scheme of existence. In short, scientists have learned that one of humanity’s simplest expressions is beautifully complex.
photo { Richard Avedon, William Simon, US Secretary of Treasury, 1976 }
