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Updated: Sep 18, 2025

Combining Behavioral Endocrinology and Experimental Economics: Testosterone and Social Decision Making
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Testosterone and emotion expression shape social interactions in defection-cooperation conflicts.

Renhui Fang1, Wenbin Pan1, Mei Li1

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|June 24, 2025
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Testosterone influences social behavior, increasing defection when facing defection but promoting cooperation during mutual cooperation. It also heightens reactions to negative emotional cues in social interactions.

Keywords:
CooperationEmotional expressionEmotional perceptionPrisoner’s Dilemma GameReciprocityTestosterone

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Area of Science:

  • Neuroendocrinology
  • Social Psychology
  • Behavioral Economics

Background:

  • Hormones like testosterone significantly impact social behaviors, including cooperation.
  • The precise role of testosterone in modulating responses to emotional expressions during social conflicts is not well understood.

Purpose of the Study:

  • To investigate the effects of testosterone administration on cooperative behavior.
  • To examine how testosterone influences emotional expression in social interactions.
  • To determine the interaction between testosterone and emotional cues in a social context.

Main Methods:

  • A double-blind, placebo-controlled study involving 61 healthy young males.
  • Administration of a single 125 mg dose of testosterone gel or placebo.
  • Participants engaged in a modified Prisoner's Dilemma Game (PDG) incorporating emotional expressions.

Main Results:

  • Testosterone administration increased the likelihood of defection when facing defection.
  • Testosterone enhanced cooperation when both players cooperated.
  • Testosterone-treated individuals showed a higher proportion of negative emotional responses (Emoji 4) when exposed to negative emotions from counterparts.

Conclusions:

  • Testosterone plays a context-specific role in social interactions, influencing behavior based on the actions and emotions of others.
  • Testosterone interacts with emotional cues to shape cooperative and competitive behaviors.
  • Findings highlight the complex interplay between hormones, emotions, and social decision-making.