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***** To join INSNA, visit http://www.insna.org ***** Evolution of ethnocentrism on undirected and directed BarabÃ^ásiâ â^¬â^À^ÜAlbert networks , Physica A Abstract: Using Monte Carlo simulations, we study the evolution of contingent cooperation and ethnocentrism in the one-shot game. Interactions and reproduction among computational agents are simulated on undirected and directed BarabÃ^ásiââ^¬â^À^ÜAlbert (BA) networks. We first replicate the Hammondââ^¬â^À^ÜAxelrod model of in-group favoritism on a square lattice and then generalize this model on undirected and directed BA networks for both asexual and sexual reproduction cases. Our simulations demonstrate that irrespective of the mode of reproduction, the ethnocentric strategy becomes common even though cooperation is individually costly and mechanisms such as reciprocity or conformity are absent. Moreover, our results indicate that the spread of favoritism towards similar others highly depends on the network topology and the associated heterogeneity of the studied population. * [18] Evolution of ethnocentrism on undirected and directed BarabÃ^ásiââ^¬â^À^ÜAlbert networks, F.W.S. Lima, Tarik Hadzibeganovic, Dietrich Stauffer, 2009/12/15, DOI: 10.1016/j.physa.2009.08.029, Physica A: Statistical Mechanics and its Applications Volume 388, Issue 24, 15 December 2009, Pages 4999-5004 ------------------------------- Effects of multiple gene control on the spread of altruism by group selection , arXiv Excerpt: It was suggested recently that chances for altruistic behavior to spread highly increase when it is controlled not by a single gene but by multiple independent genes substitutable in their effects on the phenotype of the individual. Here we confirm the original verbal model published as part of the frozen plasticity theory by numerical modeling of the spread of altruistic/selfish alleles in a metapopulation consisting of partly isolated groups of organisms (demes) interconnected by migration. We have shown that altruistic behavior coded by multiple substitutable genes can stably coexist with selfish behavior, even under relatively high mutation and migration rates, i.e. under such conditions where altruistic behavior coded by a single gene is quickly outcompeted in a metapopulation. * [19] Effects of multiple gene control on the spread of altruism by group selection, T. Kulich, J. Flegr, 2010/02/22, arXiv:1002.4204 [19] http://arXiv.org/abs/1002.4204 Barry Wellman _______________________________________________________________________ S.D. Clark Professor of Sociology, FRSC NetLab Director Department of Sociology 725 Spadina Avenue, Room 388 University of Toronto Toronto Canada M5S 2J4 twitter:barrywellman http://www.chass.utoronto.ca/~wellman fax:+1-416-978-3963 Updating history: http://chass.utoronto.ca/oldnew/cybertimes.php _______________________________________________________________________ _____________________________________________________________________ SOCNET is a service of INSNA, the professional association for social network researchers (http://www.insna.org). To unsubscribe, send an email message to [log in to unmask] containing the line UNSUBSCRIBE SOCNET in the body of the message.