title: Short-range mobility and the evolution of cooperation: an experimental study.
abstract: A pressing issue in biology and social sciences is to explain how cooperation emerges in a population of self-interested individuals. Theoretical models suggest that one such explanation may involve the possibility of changing one's neighborhood by removing and creating connections to others, but this hypothesis has problems when random motion is considered and lacks experimental support. To address this, we have carried out experiments on diluted grids with human subjects playing a Prisoner's Dilemma. In contrast to previous results on purposeful rewiring in relational networks, we have found no noticeable effect of mobility in space on the level of cooperation. Clusters of cooperators form momentarily but in a few rounds they dissolve as cooperators at the boundaries stop tolerating being cheated upon. Our results highlight the difficulties that mobile agents have to establish a cooperative environment in a spatial setting.
authors.affiliation: 1] Faculty of Business and Economics, University of Lausanne, Switzerland [2] Grupo Interdisciplinar de Sistemas Complejos (GISC), Departamento de Matemáticas, Universidad Carlos III de Madrid, Leganés, Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: Antonioni
authors.affiliation: Faculty of Business and Economics, University of Lausanne, Switzerland.
authors.forename: Marco
authors.initials: M
authors.lastname: Tomassini
authors.affiliation: 1] Grupo Interdisciplinar de Sistemas Complejos (GISC), Departamento de Matemáticas, Universidad Carlos III de Madrid, Leganés, Spain [2] Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Universidad de Zaragoza, Spain.
authors.forename: Angel
authors.initials: A
authors.lastname: Sánchez
mesh_terms: D003299:Cooperative Behavior; D005716:Game Theory; D006801:Humans; D007398:Interpersonal Relations