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Related Experiment Video

Updated: Apr 15, 2026

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Dopamine modulates egalitarian behavior in humans.

Ignacio Sáez1, Lusha Zhu2, Eric Set1

  • 1Helen Wills Neuroscience Institute, University of California, Berkeley, 175 Li Ka Shing Center, Berkeley, CA 94720, USA; Haas School of Business, University of California, Berkeley, 2220 Piedmont Avenue, Berkeley, CA 94720, USA.

Current Biology : CB
|March 25, 2015
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Summary
This summary is machine-generated.

Dopamine augmentation using tolcapone increased egalitarian behavior by enhancing aversion to inequity. This study causally links dopamine to human fairness and prosocial tendencies.

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Area of Science:

  • Neuroscience
  • Behavioral Economics
  • Social Psychology

Background:

  • Egalitarian motives drive human cooperation and prosocial behavior.
  • Dopamine is correlated with prosocial behavior, but its causal role is unclear.

Purpose of the Study:

  • To investigate the causal role of dopamine in human egalitarian tendencies.
  • To examine how dopaminergic mechanisms influence generosity and inequity aversion.

Main Methods:

  • Utilized the catechol-O-methyl transferase (COMT) inhibitor tolcapone to augment dopamine.
  • Employed economic games, including an extended dictator game, to measure prosocial behavior.
  • Applied computational modeling to analyze choice behavior.

Main Results:

  • Dopamine augmentation via tolcapone significantly increased egalitarian tendencies.
  • Computational modeling showed tolcapone selectively enhanced inequity aversion, not generosity.
  • This provides causal evidence for dopamine's role in fairness.

Conclusions:

  • Dopamine causally influences human egalitarianism, specifically by modulating inequity aversion.
  • Findings illuminate the neurochemical basis of prosocial behavior.
  • Implications for understanding social impairments in neuropsychiatric disorders with dopaminergic dysregulation.