From Animals to Animats 9 [electronic resource] : 9th International Conference on Simulation of Adaptive Behavior, SAB 2006, Rome, Italy, September 25-29, 2006. Proceedings / edited by Stefano Nolfi, Gianluca Baldassarre, Raffaele Calabretta, John C. T. Hallam, Davide Marocco, Jean-Arcady Meyer, Orazio Miglino, Domenico Parisi.