?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Evolution+of+ethnocentrism+on+undirected+and+directed+Barab%C3%A1si-Albert+networks&rft.creator=Lima%2C+Francisco+W.S.&rft.creator=Hadzibeganovic%2C+Tarik&rft.creator=Stauffer%2C+Dietrich&rft.subject=Statistical+Models&rft.subject=Sociobiology&rft.subject=Population+Biology&rft.subject=Evolution&rft.description=Using+Monte+Carlo+simulations%2C+we+study+the+evolution+of+contigent+cooperation+and+ethnocentrism+in+the+one-move+game.+Interactions+and+reproduction+among+computational+agents+are+simulated+on+undirected+and+directed+Barab%C3%A1si-%0D%0AAlbert+(BA)+networks.+We+first+replicate+the+Hammond-Axelrod+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%2C+ethnocentric+strategy+becomes+common+even+though+cooperation+is+individually+costly+and+mechanisms+such+as+reciprocity+or+conformity+are+absent.+Moreover%2C+our+results+indicate+that+the+spread+of+favoritism+toward+similar+others+highly+depends+on+the+network+topology+and+the+associated+heterogeneity+of+the+studied+population.&rft.date=2009&rft.type=Preprint&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F6447%2F1%2Fevolution_of_ethnocentrism.pdf&rft.identifier=++Lima%2C+Francisco+W.S.+and+Hadzibeganovic%2C+Tarik+and+Stauffer%2C+Dietrich++(2009)+Evolution+of+ethnocentrism+on+undirected+and+directed+Barab%C3%A1si-Albert+networks.++%5BPreprint%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F6447%2F