Why do we go red in the face when embarrassed?

Humans seem to be the only animals to show
embarrassment, and Charles Darwin called
blushing “the most peculiar and most human of all
expressions”. Blushing makes it harder to lie,
which seems like a disadvantage. However, a 2009
study by Dutch psychologists found that we are
more likely to give people a second chance if they
blush when they betray us. The ability to blush acts
as a signal that you are sensitive to the social rule
you have just broken. Psychopaths, on the other
hand, do not blush at all.


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