Abstract # 5912 Event # 128:

Scheduled for Sunday, September 14, 2014 03:30 PM-03:45 PM: Session 20 (Henry Oliver) Oral Presentation


MARMOSETS' RESPONSES TO INEQUITY FOLLOWING OXYTOCIN MANIPULATION

A. C. Mustoe and J. A. French
University of Nebraska at Omaha, Callitrichid Research Center, Department of Psychology, Omaha, NE 68182, USA
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     One of the foremost properties of human cooperation is the egalitarian sharing of resources, which provides a foundation for inequity aversion [IA]. Studying IA across many primates will elucidate functions for which IA may have evolved. Across mammals, oxytocin regulates social bonds and interpretation of social signals and is an important neuroendocrine mechanism underlying cooperative behaviors. We examined how oxytocin influences food sharing and social behavior in opposite-sex marmoset dyads (Callithrix penicillata). Marmosets performed a prosocial-choice-task where donors provision food in both equitable and unequitable outcomes to themselves and their pairmates or strangers. We administered two oxytocin agonists (Pro8 and Leu8), an oxytocin antagonist, and saline to marmoset donors to evaluate the influence of oxytocin on IA. Marmosets do not differentially provision food to others in equitable [F(2,6)=.82, p>.05, eta-squared=.22] or unequitable [F(2,6)=.18, p>.05, eta-squared=.06] outcomes, and this was not influenced by oxytocin [F(6,18)=1.38, p>.05, eta-squared=.31]. Marmosets tested with strangers spent increased time in proximity with their homecage pairmate following testing compared to marmoset donors who were tested with their pairmate or tested alone [F(2,6)=4.59, p=.06, eta-squared=.61]. Overall, marmosets do not show sensitivity to IA, but their social behavior following testing is influenced differently by the testing partner’s social affiliation regardless of oxytocin treatment. Future research will focus on the role of oxytocin on more socially salient cooperative tasks. Supported by NIH-HD042882 and UNO-GRACA.