Blushing feels like betrayal. Just when we want to hide embarrassment, blood rushes to the face and announces it publicly.
But this involuntary reaction may serve a social purpose. The remedial-signal hypothesis proposes that blushing communicates: “I recognize that I violated a rule, and I care what you think.”
Because a genuine blush is difficult to produce deliberately, it may function as a relatively honest signal of embarrassment or remorse.
In one experiment, 196 participants played a trust game against a virtual opponent who betrayed them.
Afterward, participants entrusted more money to an opponent shown blushing than to the same opponent without a blush. They also expected the blusher to be less likely to betray them again.
What is well established is that facial redness changes social judgments: depending on the situation, observers may see a blushing person as more embarrassed, sincere and forgivable.
What remains debated is whether natural selection specifically designed blushing to restore cooperation. In ambiguous situations, a blush can instead reveal that a person knowingly did something wrong.
Blushing may feel socially disastrous—but sometimes it is the body’s involuntary apology.
