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Prosocial behavior toward estranged persons modulates the interaction between midline cortical structures and the reward system.
Social Neuroscience 2018 November 29
Good reputation enhances positive self-image, which motivates prosocial behavior, a phenomenon known as indirect reciprocity. Thus, good reputation should promote prosocial behavior toward estranged people to whom affective responses leading to direct reciprocity are suppressed. We predicted that such behaviors involve an interrelationship between self-image, processed in the medial prefrontal cortex (mPFC) and precuneus, and social reward, processed in the reward system. To test our hypothesis, we performed fMRI on 21 participants during a virtual ball-toss game after subjects formed negative impressions (estrangement) or neutral impressions of other players. During some blocks of the game, the other players did not receive tosses, and participants could increase tosses to them (i.e., engage in prosocial behavior). Participants significantly increased tosses to all isolated players; therefore, prosocial behavior occurred irrespective of estrangement. Prosocial behavior toward estranged players enhanced positive self-image and increased activation of the anterior mPFC and precuneus. The precuneus exhibited enhanced functional connectivity with the striatum. Thus, a positive self-image, represented by an interaction between the midline cortical structures and striatum, plays key roles in prosocial behavior toward estranged people.
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