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Area of Science:

  • Neuroscience
  • Social Psychology
  • Behavioral Economics

Background:

  • Human cooperation is crucial but often risky, relying on collective participation for mutual benefit.
  • Arginine vasopressin (AVP), a neuropeptide, is known to influence social behaviors in mammals.

Purpose of the Study:

  • To investigate the causal effect of AVP on human willingness to engage in risky cooperation.
  • To explore the neural mechanisms underlying AVP's influence on cooperative decision-making.

Main Methods:

  • Two double-blind, placebo-controlled experiments using intranasal AVP administration.
  • Participants played the "Stag hunt" cooperation game, involving financial risks and rewards.
  • Functional magnetic resonance imaging (fMRI) was used to analyze brain activity during decision-making.

Main Results:

  • AVP significantly increased participants' willingness to engage in risky cooperation.
  • The effect of AVP was specific to cooperation and not due to general risk-taking or altruism.
  • AVP modulated neural activity in the dorsolateral prefrontal cortex (dlPFC) and its connectivity with the ventral pallidum.

Conclusions:

  • AVP causally enhances humans' propensity for risky, mutually beneficial cooperation.
  • AVP influences social approach behavior by altering risk-related neural processing and reward pathways.
  • Findings reveal a novel role for AVP in human social decision-making, bridging animal and human research.