Affect and prosocial behavior: The role of decision mode and individual processing style

We study the effects of experimental manipulation of decision mode (rational “brain” vs. affective “heart”) and individual difference in processing styles (intuition vs. deliberation) on prosocial behavior. In a survey experiment with a diverse sample of the Swedish population (n = 1,828), we elicited the individuals’ processing style and we experimentally manipulated reliance on affect or reason, regardless of subjects’ preferred mode. Prosocial behavior was measured across a series of commonly used and incentivized games (prisoner’s dilemma game, public goods game, trust game, dictator game). Our results show that prosocial behavior increased for the affective (“heart”) decision mode. Further, individual differences in processing style did not predict prosocial behavior and did not interact with the experimental manipulation.