Source: Futility Closet
Darwin’s colleague Guillaume Duchenne first noticed the difference between smiles that are caused by enjoyment and those that aren’t. Both feature raised lip corners, but a genuine smile also activates the muscles around the eyes (lateral portions of the orbicularis oculi), causing “crow’s feet.”
This “Duchenne marker” is remarkably revealing. By observing it, researchers can predict whether an infant is being approached by its mother or…
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