Moral sentiments and cooperation: Differential influences of shame and guilt

For centuries economists and psychologists (Frank, 1988 Frank , R. H. (1988) . Passions within reason: The strategic role of the emotions . New York : Norton . (Originally published 1988) Google Scholar; Ketelaar, 2004 Ketelaar, T. 2004. “Ancestral emotions, current decisions: Using evolutionary game theory to explore the role of emotions in decision-making”. In Evolutionary psychology, public policy and personal decisions, Edited by: Crawford, C. and Salmon, C. 145–163. Mahwah, NJ: Lawrence Erlbaum Associates, Inc. Google Scholar; Smith, 1759) have argued that moral emotions motivate cooperation. Ketelaar and Au (2003 Ketelaar, T. and Au, W. T. 2003. The effects of guilt on the behaviour of uncooperative individuals in repeated social bargaining games: An affect-as-information interpretation of the role of emotion in social interaction. Cognition and Emotion, 17: 429–453. Taylor & Francis Online, Web of Science ® , Google Scholar) recently found first evidence that guilt increases cooperation for proselfs in social bargaining games. We investigated whether this effect would also occur for shame, another moral emotion. Using a dyadic social dilemma game in Experiment 1 and an everyday cooperation measure in Experiment 2 as measures for short-term cooperation, we replicated Ketelaar and Au's findings for guilt. However, as predicted on the basis of previous emotion research, we found no such effect for shame. These results clearly indicate that the effects of moral emotions on cooperative behaviour can only be understood if the specific moral emotion is known.