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Related Experiment Video

Updated: Jan 17, 2026

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Oxytocin restores context-specific hyperaltruistic preference.

Hong Zhang1, Yinmei Ni1, Jian Li1,2

  • 1School of Psychological and Cognitive Sciences and Beijing Key Laboratory of Behavior and Mental Health, Peking University, Beijing, China.

Elife
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People show hyperaltruism, sacrificing more for others than themselves. This bias disappears when facing losses, but oxytocin can restore it by influencing harm perception.

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Area of Science:

  • Neuroscience
  • Moral Psychology
  • Behavioral Economics

Background:

  • Research shows conflicting findings on altruism: hyperaltruism (more sacrifice for others) versus egoism (less harm to self for others).
  • A mechanistic explanation for context-dependent hyperaltruism is needed to reconcile these findings.

Purpose of the Study:

  • To investigate the psychological mechanisms underlying hyperaltruism.
  • To examine how decision context (gains vs. losses) and oxytocin influence hyperaltruistic preferences.

Main Methods:

  • Participants made trade-off choices involving monetary outcomes (gains or losses) and painful electric shocks.
  • Study 1 manipulated the decision context (gains vs. losses).
  • Study 2 administered oxytocin and examined its effect on decision-making and harm framing.

Main Results:

  • The hyperaltruistic preference was eliminated in the loss context, altering the relationship between instrumental harm (IH) attitudes and pain sensitivity.
  • Oxytocin restored the context-dependent hyperaltruistic preference.
  • Oxytocin increased the framing of the task as harming others, mediating the link between IH and pain sensitivity.

Conclusions:

  • Decision context (gains vs. losses) significantly modulates hyperaltruism.
  • Oxytocin influences hyperaltruism by altering subjective harm perception and framing.
  • Findings elucidate the psychological underpinnings of context-specific hyperaltruism and inform prosocial behavior interventions.