What is it about?
Emergence and proliferation of life requires cooperation between molecules, genes, cells, and entire organisms. Yet, Darwinian evolution appears to promote self-centered behavior - populations of cooperating organisms are vulnerable to cheaters that use public goods without contributing to them. This tension between selfishness and cooperativity may lead to the collapse of populations and societies. Here we demonstrate how this fundamental conflict can be resolved if the level of cooperation is allowed to depend on the opponent's appearance and behavior.
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Why is it important?
It was previously thought that the game of prisoner's dilemma always leads to cheaters getting the upper hand in the end. We have shown that this does not have to be the case - high levels of cooperation can emerge in societies if players react differently to different opponents, cooperating with some but cheating with others.
Perspectives
I hope that our work makes people think that societal collapse and bitter rivalry are not inevitable. Yes, cheating will always be present in human and animal societies - but, in many cases, it will be balanced by acts of kindness and selfless, cooperative behavior.
Alexandre Morozov
Rutgers University New Brunswick
Read the Original
This page is a summary of: Emergence of cooperation due to opponent-specific responses in Prisoner’s Dilemma, Proceedings of the National Academy of Sciences, May 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2513282123.
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