Seminar----Institute of Theoretical Physics，Chinese Academy of Sciences

Institute of Theoretical Physics
Chinese Academy of Sciences
Key Laboratory of Theoretical Physics
Seminar
Title 题目	Experimental evidence on winning strategies of prisoner's dilemma
Speaker 报告人	Dr. Zhijian Wang
Affiliation 所在单位	Zhejiang University
Date 日期	20 February 2017, Monday: 15:30--16:30
Venue 地点	ITP NEW BUILDING 6420
Abstract 摘要	The iterated prisoner's dilemma game (IPD), relating to the social cooperation, is a basic model in social science. For long time, the mutual cooperation strategy is regarded as the best winning strategy in IPD. But, as recently discovered by Press and Dyson (2012), the zero-determinant (ZD) extortionate strategy can enforce a linear relationship between a pair of players' scores, and can enforce and exploit cooperation, providing the extortionate strategist with a score advantage, and consequently higher scores than those from the mutual cooperation. This result overturned several decades of consensus about the IPD. In laboratory experiments in which human subjects were paired with computer co-players (extortionate ZD strategists), we demonstrate that the extortionate ZD strategies indeed enforce a unilateral control of the reward. When the experimental setting is sufficiently long and the computerized nature of the opponent is known to human subjects, the extortionate ZD strategy outperforms --- significantly more extortionate strategists finally obtain an average score higher than that from mutual cooperation. At the end of the talk, we will discuss the potential existence of such extortionate strategists in the real life and the social network, the evolutionary processes of human when facing the extorters in experiments, and how to model the processes of the human learning to be extorted in the deep learning view. Press, W. H. and Dyson, F. J. Iterated prisoner's dilemma contains strategies that dominate any evolutionary opponent. Proc. Natl Acad. Sci. USA 109, 10409--10413 (2012). Hilbe, C. et al. Extortion subdues human players but is finally punished in the prisoner's dilemma. Nature Communications, 5, 3976 (2014). Wang, Z. et al. Extortion can outperform generosity in the iterated Prisoner's Dilemma. Nature Communications, 7, 11125 (2016)
Contact Person 联系人	Hai-Jun Zhou