Humans are very good at reading facial expressions of others, but the smile has proved to be more difficult to interpret.
Take, for example the enigmatic smile of the Mona Lisa, which has baffled viewers for centuries.
“There is a wide range of more ambiguous expressions, from which it is difficult to deduce the underlying emotional state. A typical example is the expression of happiness,” said David Beltrán Guerrero, researcher at the University of La Laguna in Spain, an expert who …
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