This compilation of cutting-edge philosophical and scientific research comprises a survey of recent neuroscientific research on representational systems in animals and humans. Representational systems provide their owners with useful information about their environment and are shaped by the special informational needs of the organism with respect to its environment. In this volume, the authors address the long-standing dispute about the usefulness of the notion of representation in the study of behavior systems and offer a fresh perspective on representational systems that combines philosophical insights and experimental experience.