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Natural Selection of Memory-one Strategies for the Iterated Prisoner's Dilemma

✍ Scribed by DAVID P. KRAINES; VIVIAN Y. KRAINES

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 289 KB
Volume: 203
Category: Article
ISSN: 0022-5193
DOI: 10.1006/jtbi.2000.1089

No coin nor oath required. For personal study only.

✦ Synopsis

In the iterated Prisoner's Dilemma, mutually cooperative behavior can become established through Darwinian natural selection. In simulated interactions of stochastic memory-one strategies for the Iterated Prisoner's Dilemma, Nowak and Sigmund discovered that cooperative agents using a Pavlov (Win-Stay Lose-Switch) type strategy eventually dominate a random population. This emergence follows more directly from a deterministic dynamical system based on di!erential reproductive success or natural selection. When restricted to an environment of memory-one agents interacting in iterated Prisoner's Dilemma games with a 1% noise level, the Pavlov agent is the only cooperative strategy and one of very few others that cannot be invaded by a similar strategy. Pavlov agents are trusting but no suckers. They will exploit weakness but repent if punished for cheating.

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