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Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the...
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Related Experiment Video

Updated: Dec 23, 2025

New Variations for Strategy Set-shifting in the Rat
09:45

New Variations for Strategy Set-shifting in the Rat

Published on: January 23, 2017

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Evolution of strategic cooperation.

P G Madgwick1, J B Wolf1

  • 1Milner Centre for Evolution, Department of Biology and Biochemistry University of Bath Bath BA2 7AY United Kingdom.

Evolution Letters
|April 22, 2020
PubMed
Summary

Strategic cooperation in groups presents a paradox. While relatedness benefits groups, highly related individuals may have lower fitness due to cooperation costs, challenging evolutionary theory.

Keywords:
Cooperationgroup selectionkin selectionpublic goodssocial behavior

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Area of Science:

  • Evolutionary biology
  • Game theory
  • Behavioral ecology

Background:

  • Group-beneficial behaviors pose challenges for evolutionary theory due to individual costs and shared benefits.
  • The potential for

Purpose of the Study:

  • To model strategic cooperation where individuals adjust contributions to group-beneficial behaviors based on social context.
  • To investigate the evolutionary dynamics of cooperation and cheating in social groups.

Main Methods:

  • Developed an evolutionary game model to simulate strategic cooperation.
  • Players quantitatively adjust their contributions to group-beneficial actions.

Main Results:

  • The evolutionarily stable strategy (ESS) suggests contributions align with relatedness to the group.
  • Surprisingly, higher relatedness can lead to lower individual fitness due to cooperation dynamics.
  • Cooperation equalizes fitness returns, diminishing the advantage of high relatedness.

Conclusions:

  • Groups with higher relatedness may not be evolutionarily optimal for individual fitness.
  • A paradox exists where group success is linked to relatedness, but individual fitness within the group is inversely related.
  • Strategic cooperation dynamics can lead to unexpected fitness outcomes for individuals within social groups.