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- W2046579047 abstract "When people play a repeated game they usually try to anticipate their opponents' moves based on past observations, and then decide what action to take next. Behavioural economics studies the mechanisms by which strategic decisions are taken in these adaptive learning processes. We here investigate a model of learning the iterated prisoner's dilemma game. Players have the choice between three strategies, always defect (ALLD), always cooperate (ALLC) and tit-for-tat (TFT). The only strict Nash equilibrium in this situation is ALLD. When players learn to play this game convergence to the equilibrium is not guaranteed, for example we find cooperative behaviour if players discount observations in the distant past. When agents use small samples of observed moves to estimate their opponent's strategy the learning process is stochastic, and sustained oscillations between cooperation and defection can emerge. These cycles are similar to those found in stochastic evolutionary processes, but the origin of the noise sustaining the oscillations is different and lies in the imperfect sampling of the opponent's strategy. Based on a systematic expansion technique, we are able to predict the properties of these learning cycles, providing an analytical tool with which the outcome of more general stochastic adaptation processes can be characterised." @default.
- W2046579047 created "2016-06-24" @default.
- W2046579047 creator A5050871942 @default.
- W2046579047 date "2011-08-08" @default.
- W2046579047 modified "2023-10-14" @default.
- W2046579047 title "Cycles of cooperation and defection in imperfect learning" @default.
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- W2046579047 doi "https://doi.org/10.1088/1742-5468/2011/08/p08007" @default.
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