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Limited memory optimizes cooperation in social dilemma experiments.

Shuangmei Ma1,2, Boyu Zhang3, Shinan Cao4

  • 1School of Systems Science, Beijing Normal University, Beijing 100875, People's Republic of China.

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|August 30, 2021
PubMed
Summary
This summary is machine-generated.

Working-memory capacity significantly impacts cooperation. Optimal cooperation in repeated Prisoner's Dilemma games occurs with memory of two past rounds, suggesting a neural basis for social behavior.

Keywords:
cooperationevolutionary game theoryworking memory

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Area of Science:

  • Neuroscience
  • Behavioral Economics
  • Evolutionary Biology

Background:

  • Cooperation is fundamental to human society, yet the neural underpinnings remain underexplored.
  • Existing research on cooperation mechanisms often overlooks cognitive functions like working memory.

Purpose of the Study:

  • To investigate the influence of working-memory capacity on cooperative behavior in repeated Prisoner's Dilemma experiments.
  • To identify the specific working-memory thresholds that affect cooperation levels.

Main Methods:

  • Developed an experimental paradigm to precisely measure and manipulate subjects' working-memory capacity.
  • Conducted repeated Prisoner's Dilemma games with varying memory conditions.
  • Utilized computational models (replicator dynamics, Markov processes) to analyze experimental data.

Main Results:

  • Cooperation significantly increased with minimal working memory capacity compared to none.
  • Optimal cooperation levels were observed when participants could recall information from two previous rounds.
  • Experimental findings align with proposed memory-based conditional cooperation models.

Conclusions:

  • Working-memory capacity provides a neural basis for cooperative behavior.
  • The study suggests evolutionary roots for cooperation beyond cultural factors.
  • Findings challenge existing models and highlight the role of cognitive functions in social dynamics.