Theory of mind: did evolution fool us?

Area of Science:

• Cognitive Science
• Evolutionary Psychology
• Behavioral Economics

Background:

• Theory of Mind (ToM) enables predicting behavior by attributing mental states.
• Social interactions necessitate recursive ToM (e.g., "I think you think...").
• Evidence suggests human ToM recursion is limited, contrary to expected adaptive fitness.

Purpose of the Study:

• Investigate if limited ToM sophistication is evolutionarily adaptive.
• Propose a model to predict behavior based on ToM sophistication.
• Quantify the adaptive fitness of different ToM levels.

Main Methods:

• Developed a meta-Bayesian approach to model ToM phenotypes in social interactions.
• Utilized evolutionary game theory to assess the adaptive fitness of ToM sophistication.
• Analyzed the cost-benefit ratio of ToM sophistication in competitive and cooperative contexts.

Main Results:

• Limited ToM sophistication is not solely due to biological costs; evolutionary costs are significant.
• Informational costs prevent highly sophisticated ToM from fully exploiting less sophisticated individuals.
• Cooperation paradoxically favors lower levels of ToM sophistication.

Conclusions:

• The study provides an evolutionary explanation for limited human ToM sophistication.
• Quantitative findings support the "social Bayesian brain" hypothesis.
• Explains the persistence of lower ToM sophistication levels in human populations.