Reward Association With Mental States Shapes Empathy and Prosocial Behavior.

Valuing the welfare of others is a fundamental aspect of empathy and prosocial behavior. How do people develop this valuation? Theories of associative learning suggest that people can associate social cues, such as smiles, with personal reward, thus feeling good when others thrive. Yet people often display generalized concern for others' welfare, regardless of the specific cues present. We propose that Pavlovian conditioning allows people to associate reward directly with others' abstract mental states, learning that another's happiness predicts their own reward. In four online experiments with 1,500 U.S.-based adults recruited from CloudResearch, participants' monetary outcomes were congruently or incongruently predicted by a target's mental states. Participants who experienced congruent learning reported more empathic feelings toward the target in novel situations. The values attached to mental states further influenced participants' prosocial choices. These results demonstrate how associative learning of abstract mental states can give rise to generalizable empathy and influence moral behavior.