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Two distinct neural mechanisms underlying indirect reciprocity.

Takamitsu Watanabe1, Masanori Takezawa, Yo Nakawake

  • 1Departments of Physiology, Radiology, and Neuropsychiatry, The University of Tokyo School of Medicine, Tokyo 113-0033, Japan.

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Humans cooperate with strangers through indirect reciprocity, either reputation-based or pay-it-forward. This study reveals distinct brain mechanisms for each, involving the precuneus and anterior insula, respectively.

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Area of Science:

  • Neuroscience
  • Social Psychology
  • Behavioral Economics

Background:

  • Human cooperation with non-kin, even strangers, is facilitated by indirect reciprocity.
  • Indirect reciprocity operates via reputation mechanisms or pay-it-forward behavior.
  • Understanding the neural underpinnings of these distinct cooperative strategies is crucial.

Purpose of the Study:

  • To provide functional and anatomical neural evidence for two distinct mechanisms governing reputation-based and pay-it-forward indirect reciprocity.
  • To identify specific brain regions and their connectivity patterns associated with each type of indirect reciprocity.
  • To explore the relationship between neural structures, functional connectivity, and cooperative tendencies.

Main Methods:

  • Utilized functional neuroimaging techniques to observe brain activity during cooperative tasks.
  • Investigated functional connectivity between brain regions, including resting-state functional connectivity (rsFC).
  • Analyzed anatomical gray matter volume in relation to cooperative behavior.

Main Results:

  • Reputation-based reciprocity recruited the precuneus, linked to self-centered cognition, and showed functional connectivity with the caudate.
  • Precuneus gray matter volume and rsFC with the caudate predicted reputation-based cooperation.
  • Pay-it-forward reciprocity recruited the anterior insula (AI), associated with affective empathy, and its connectivity with the caudate.
  • AI gray matter volume and rsFC with the caudate predicted pay-it-forward cooperation.

Conclusions:

  • Distinct neural mechanisms underlie reputation-based (precuneus-caudate) and pay-it-forward (AI-caudate) indirect reciprocity.
  • Findings align with evolutionary game theory, suggesting reputation-based reciprocity is self-interested, while pay-it-forward may involve emotional rewards.
  • This research elucidates the neural basis of indirect reciprocity, highlighting the role of self-centered cognition and affective empathy.