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--- geopro:pedro:gamesongrids [2008/01/15 10:29] – pedro
+++ geopro:pedro:gamesongrids [2008/02/26 22:18] (atual) – 150.163.67.167
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 ====== Games on Grids ======
+====Prisoner's dilemma and clusters on small-world networks====
+|X. Thibert-Plante, L. Parrott, 2007| Complexity 12(6)22-36|
+\\
+**Abstract:** The structure of interaction plays an important role in the outcome of evolutionary games. This study investigates the evolution of stochastic strategies of the prisoner's dilemma played on structures ranging from lattices to small world networks. Strategies and payoffs are analyzed as a function of the network characteristics of the node they are playing on. Nodes with lattice-like neighborhoods tend to perform better than the nodes modified during the rewiring process of the construction of the small-world network.
+\\
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 Each additional benefit may be discounted or synergistically enhanced by a factor w. [Forçando a barra para a cooperação? FIXME: Verificar no artigo]
+====The Arithmetics of Mutual Help====
+|M. A. Nowak, R. M. May and K. Sigmund, 1995| Scientific American| [[http://www.leg.ufpr.br/~pedro/papers/sciam/SciAm95a.pdf|pdf]]|
+{{ http://www.leg.ufpr.br/~pedro/figures/cooperators-generations.jpg?300}}
+\\
+But what of the creatures, such as many invertebrates, that seem to exhibit
+forms of reciprocal cooperation, even though they often cannot recognize individual
+players or remember their actions? Or what if future payoffs are heavily discounted? How can altruistic
+arrangements be established and maintained in these circumstances? One possible
+solution is that these players find a fixed set of fellow contestants and make
+sure the game is played largely with them. In general, this selectivity will be
+hard to attain. But there is one circumstance in which it is not only easy, it is
+automatic. **If the players occupy fixed sites, and if they interact only with close
+neighbours, there will be no need to recognize and remember, because the other
+players are fixed by the geometry.** Whereas in many of our simulations
+players always encounter a representative sample of the population, we have
+also looked specifically at scenarios in which every player interacts only with
+a few neighbours on a two-dimensional grid. Such "spatial games" are very recent.
+They give an altogether new twist to the Prisoner's Dilemma.
+\\
 ====The geometrical patterns of cooperation evolution in the spatial prisoner’s dilemma: An intra-group model====
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 \\
 ====Prisoner's Dilemma Game with Heterogeneous Influential Effect on Regular Small-World Networks====