Oxytocin changes behavior and spatio-temporal brain dynamics underlying inter-group conflict in humans
Bastian Schiller1, Gregor Domes2, Markus Heinrichs1
1Department of Psychology, Laboratory for Biological and Personality Psychology, University of Freiburg, D-79104 Freiburg, Germany; Freiburg Brain Imaging Center, University Medical Center, University of Freiburg, D-79106 Freiburg, Germany.
Summary
The neuropeptide oxytocin reduced negative social behaviors towards rival groups in a study of inter-group conflict. Oxytocin also altered brain activity related to valuing outcomes for out-group members.
Area of Science:
- Neuroscience
- Social Psychology
- Behavioral Economics
Background:
- Inter-group conflicts contribute to discrimination and violence, yet their underlying psychobiological mechanisms are not fully understood.
- Understanding these mechanisms is crucial for developing interventions to mitigate inter-group hostility.
Purpose of the Study:
- To investigate the role of the neuropeptide oxytocin in modulating behavior and brain dynamics during naturalistic inter-group conflict.
- To determine if oxytocin influences decision-making and neurophysiological responses in contexts of social rivalry.
Main Methods:
- Eighty-six male members of rival social groups received intranasal oxytocin or a placebo.
- Participants engaged in a decision-making task with real monetary stakes, affecting in-group and out-group members.
- Spatio-temporal analysis of event-related potentials (ERPs) was used to examine brain dynamics during outcome valuation.
Main Results:
- Oxytocin administration eliminated the tendency to reduce out-group members' gains, a behavior observed in the placebo group.
- This effect was particularly pronounced in individuals with low emotional empathy.
- Neurophysiological analysis revealed that oxytocin shifted brain activity from negative to positive valuation of out-group gains between 200-500ms post-outcome.
Conclusions:
- Oxytocin modulates human inter-group behavior by altering valuation-related brain dynamics.
- The findings suggest a potential therapeutic target for reducing inter-group conflict and promoting prosocial behavior towards rival groups.
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