Poster D27, Monday, March 27, 8:00 – 10:00 am, Pacific Concourse
Sex Differences in Cooperation Decisions Following Observed Affective Non-Verbal Social Interactions: An ERP Investigation
Matthew Moore1, Illia Kuznietsov2, Yuta Katsumi1, Stephanie Kern1, Qingying Zheng1, Sanda Dolcos1, Florin Dolcos1; 1University of Illinois at Urbana-Champaign, 2Eastern European National University
Cooperation behaviors in social dilemmas have been shown to be sensitive to manipulations of context, and evidence suggests that females are more sensitive to contextual aspects than males. However, it is not clear how aspects of social decision context, such as observed affective non-verbal behaviors in social interactions, may influence cooperation decisions and the underlying neuro-behavioral mechanisms. In the present study, the influence of observed social interactions was examined with respect to decisions to accept or reject monetary offers in a Ultimatum game. A total of 48 participants completed the task. Participants responded to offers following proposer’s dynamic Approach (friendly) or Avoidance (non-friendly) behaviors. Behavioral results showed that female participants tended to reject more unfair offers than males did. However, both females and males rejected fewer offers from female proposers following approach behaviors, and female participants showed overall greater sensitivity to proposers’ sex and behavior compared to males. Consistent with the behavioral findings, preliminary analyses of event-related potentials (ERPs) in females showed greater N2 following the onset of social interaction conditions with male proposers, compared to social interaction conditions with female proposers. This suggests possibly increased monitoring in earlier stages of social interaction with male proposers, which resulted in increased rate of rejected offers. The mechanisms of these differences were further investigated with additional manipulations involving comparisons of Community/pro-social and Individualistic/pro-self game framings. The results will be discussed in the context of sex differences in behavioral and ERP findings, related to the effect of non-verbal affective behaviors and framing manipulations.
Topic Area: EMOTION & SOCIAL: Emotion-cognition interactions