From animals to animats 9 : 9th International Conference on Simulation of Adaptive Behavior, SAB 2006, Rome, Italy, September 25-29, 2006, Proceedings - Nolfi, Stefano; Baldassarre, Gianluca; Calabretta, Raffaele; Hallam, John C. T.; Marocco, Davide; Meyer, Jean-Arcady; Miglino, Orazio; Parisi, Domenico (Lecture Notes in Computer Science, 2006)