One for all: What representing a group may do to us

Collective bargaining, business alliances, diplomacy between nations — interactions between group representatives include topics that may have some of the greatest impact on our lives. Nevertheless, the nature of such interactions is poorly understood. How do representatives approach such interactions? What goals do they pursue, and what expectations do they have of their counterpart? In the present research, we advance a theoretical framework with which to understand the mindset that is activated by the role of representative. In two studies, we measure what goals (Study 1) and expectations (Study 2) become salient in this role, compared with the related roles of individual or group member. Our findings reveal that representatives may display a more competitive mindset, consisting of more competitive goals and expectations of others. As competition can be harmful, rather than beneficial to the group, care should be taken when relying on representatives, so that we may exploit their strengths while curtailing their weaknesses.     

Friend versus foe: Neural correlates of prosocial decisions for liked and disliked peers

Although the majority of our social interactions are with people we know, few studies have investigated the neural correlates of sharing valuable resources with familiar others. Using an ecologically valid research paradigm, this functional magnetic resonance imaging study examined the neural correlates of prosocial and selfish behavior in interactions with real-life friends and disliked peers in young adults. Participants (N = 27) distributed coins between themselves and another person, where they could make selfish choices that maximized their own gains or prosocial choices that maximized outcomes of the other. Participants were more prosocial toward friends and more selfish toward disliked peers. Individual prosociality levels toward friends were associated negatively with supplementary motor area and anterior insula activity. Further preliminary analyses showed that prosocial decisions involving friends were associated with heightened activity in the bilateral posterior temporoparietal junction, and selfish decisions involving disliked peers were associated with heightened superior temporal sulcus activity, which are brain regions consistently shown to be involved in mentalizing and perspective taking in prior studies. Further, activation of the putamen was observed during prosocial choices involving friends and selfish choices involving disliked peers. These findings provide insights into the modulation of neural processes that underlie prosocial behavior as a function of a positive or negative relationship with the interaction partner.