Moral Emotions

Moral emotions are affective responses — guilt, shame, indignation, gratitude, compassion, contempt — that function as commitment devices in social interaction, making certain behaviors predictably costly or rewarding and thereby solving coordination problems without explicit contracting.

From an evolutionary game-theoretic perspective, moral emotions are not merely feelings but strategic infrastructure. Guilt makes defection from cooperation internally costly, transforming an agent into a reliable partner. Shame publicizes wrongdoing, making reputation damage the internal echo of external punishment. Indignation motivates costly punishment of norm-violators, solving free-rider problems that rational choice alone cannot.

The empirical study of moral emotions bridges psychology, neuroscience, and behavioral economics, revealing that agents with damage to brain regions associated with emotional processing often become hyper-rational in precisely the sense that makes them socially dysfunctional: they can calculate outcomes but cannot commit to cooperative strategies. The implication is that moral emotions are not obstacles to rationality but components of a broader rationality calibrated for social life.