There is an excellent article on trustworthy faces on Social Capital Blog. They write:

“In a paper published in June, they [researchers] suggested that our unconscious bias is a byproduct of more adaptive instincts: the features that make a face strike us as trustworthy, if exaggerated, make a face look happy – with arching inner eyebrows and upturned mouths – and an exaggerated untrustworthy face looks angry – with a furrowed brow and frown. In this argument, people with trustworthy faces simply have, by the luck of the genetic draw, faces that look a little more cheerful to us.”


“Just as in other cognitive shorthands, we make these judgments quickly and unconsciously – and as a result, Oosterhof and Todorov point out, we can severely and immediately misjudge people. In reality, of course, cheekbone shape and eyebrow arc have no relationship with honesty.”


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