title: The neurobiology of trust.
abstract: This is the first report that endogenous oxytocin in humans is related to social behaviors, which is consistent with a large animal literature. Subjects are put into a social dilemma in which absent communication, cooperative behavior can benefit both parties randomly assigned to a dyad. The dilemma arises because one participant must make a monetary sacrifice to signal the degree of trust in the other before the other's behavioral response is known. We show that receipt of a signal of trust is associated with a higher level of peripheral oxytocin than that in subjects receiving a random monetary transfer of the same average amount. Oxytocin levels were also related to trustworthy behavior (sharing a greater proportion of the monetary gains). We conclude that oxytocin may be part of the human physiology that motivates cooperation.
authors.affiliation: Center for Neuroeconomics Studies, Claremont Graduate University, Claremont, CA 91711-6165, USA. paul.zak@cgu.edu
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Zak
authors.forename: Robert
authors.initials: R
authors.lastname: Kurzban
authors.forename: William T
authors.initials: WT
authors.lastname: Matzner
mesh_terms: D003657:Decision Making / Q000502:physiology; D006801:Humans; D007398:Interpersonal Relations; D010121:Oxytocin / Q000378:metabolism / Q000502:physiology*
chemical_list: D010121:Oxytocin