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A model of risk and mental state shifts during social interaction

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  • Andreas Hula
  • Iris Vilares
  • Terry Lohrenz
  • Peter Dayan
  • P Read Montague

Abstract

Cooperation and competition between human players in repeated microeconomic games offer a window onto social phenomena such as the establishment, breakdown and repair of trust. However, although a suitable starting point for the quantitative analysis of such games exists, namely the Interactive Partially Observable Markov Decision Process (I-POMDP), computational considerations and structural limitations have limited its application, and left unmodelled critical features of behavior in a canonical trust task. Here, we provide the first analysis of two central phenomena: a form of social risk-aversion exhibited by the player who is in control of the interaction in the game; and irritation or anger, potentially exhibited by both players. Irritation arises when partners apparently defect, and it potentially causes a precipitate breakdown in cooperation. Failing to model one’s partner’s propensity for it leads to substantial economic inefficiency. We illustrate these behaviours using evidence drawn from the play of large cohorts of healthy volunteers and patients. We show that for both cohorts, a particular subtype of player is largely responsible for the breakdown of trust, a finding which sheds new light on borderline personality disorder.Author summary: In multi-round games in which players can benefit by trusting each other, swift and catastrophic breakdowns can arise amidst otherwise efficient cooperation. We present a model that quantifies this as a form of anger, and we exploit novel algorithmic improvements in inference based on the model to examine exchanges involving healthy volunteers and people suffering from personality disorders. This provides a new view on the problems that can underlie social interactions.

Suggested Citation

  • Andreas Hula & Iris Vilares & Terry Lohrenz & Peter Dayan & P Read Montague, 2018. "A model of risk and mental state shifts during social interaction," PLOS Computational Biology, Public Library of Science, vol. 14(2), pages 1-20, February.
  • Handle: RePEc:plo:pcbi00:1005935
    DOI: 10.1371/journal.pcbi.1005935
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