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Recursive mentalizing and common knowledge in the bystander effect.

Kyle A Thomas1, Julian De Freitas1, Peter DeScioli2

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The bystander effect, where fewer people help in larger groups, may stem from strategic calculations. Individuals may avoid helping if they believe others feel obligated, a finding supported by recursive theory of mind.

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Area of Science:

  • Social Psychology
  • Behavioral Economics
  • Cognitive Science

Background:

  • The bystander effect describes reduced helping behavior as the number of potential helpers increases.
  • Traditional explanations focus on diffusion of responsibility, where individual accountability diminishes in groups.

Purpose of the Study:

  • To investigate an alternative explanation for the bystander effect using the volunteer's dilemma and recursive theory of mind.
  • To test whether strategic shirking, based on inferred obligations of others, drives reduced helping behavior.

Main Methods:

  • Three experiments were conducted with participants in groups of 2 or 5.
  • Participants decided whether to help a fictional person needing assistance, with varying levels of information about others' knowledge.
  • Recursive theory of mind was manipulated by controlling the depth of asymmetric knowledge about who knew help was needed.

Main Results:

  • Helping decisions varied significantly with the depth of asymmetric, recursive knowledge.
  • The classic bystander effect was replicated when participants had common knowledge (everyone knows that everyone knows).
  • Results indicate strategic computations, not just responsibility diffusion, underlie the bystander effect.

Conclusions:

  • The bystander effect can be explained by strategic calculations based on recursive theory of mind.
  • Individuals may strategically withhold help when they believe others feel compelled to act.
  • This research highlights the role of cognitive inference in prosocial behavior within groups.