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Efficiency Recalibrates Social-Emotional Trade-Offs Behind Partner Choice in Direct Reciprocity through

Rui Liao1, Xintong Li2, Xuqi Liu1

  • 1Shanghai Key Laboratory of Mental Health and Psychological Crisis Intervention, School of Psychology and Cognitive Science, East China Normal University, Shanghai, 200062, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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Reciprocal efficiency guides partner choice in cooperation by adjusting social-emotional priorities. This study reveals how the brain balances gratitude, guilt, and obligation when deciding whom to repay.

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Area of Science:

  • Neuroscience
  • Social Psychology
  • Behavioral Economics

Background:

  • Direct reciprocity is fundamental to human cooperation.
  • Partner choice, or whom to reciprocate, is understudied compared to partner control.
  • Social-emotional motivations and reciprocal efficiency influence partner choice.

Purpose of the Study:

  • To investigate how social-emotional motivations and reciprocal efficiency guide partner choice in direct reciprocity.
  • To explore the neural mechanisms underlying these choices using fMRI.
  • To bridge economic models of rational choice with psychological theories of social emotions.

Main Methods:

  • An interpersonal task combined with functional magnetic resonance imaging (fMRI).
  • Multivariate neural expression and representational similarity analysis were employed.
  • Participants made choices about reciprocating favors from multiple benefactors.

Main Results:

  • Reciprocal efficiency recalibrates choices between altruistic and strategic benefactors.
  • Prioritizing communal concerns (gratitude/guilt) in the ventromedial prefrontal cortex (vmPFC) occurred when reciprocating to altruistic benefactors was more efficient.
  • Prioritizing obligation in the ventral striatum occurred when reciprocating to strategic benefactors was more efficient.
  • Specific brain regions (putamen, dmPFC, OFC, IPL) were involved in processing general efficiency and integrating recalibration.

Conclusions:

  • Reciprocal efficiency adaptively reweights social-emotional concerns in partner selection.
  • The findings suggest that efficiency optimizes not just material outcomes but social-emotional considerations.
  • This research offers insights into human cooperation and has practical applications.