Department of Molecular Biology and Neuroscience Institute, Princeton University, Princeton, United States of America, Institut de la Vision, INSERM UMRS 968, UPMC UM 80, CNRS UMR 7210, Paris, France.|Institute of Science and Technology Austria, Klosterneuburg, Austria.|Department of Psychology, University of Pennsylvania, Philadelphia, United States of America.|Laboratoire de Physique Statistique, xc3x89cole Normale Supxc3xa9rieure, CNRS and UPMC, Paris, France.|Institute of Science and Technology Austria, Klosterneuburg, Austria.|Department of Molecular Biology and Neuroscience Institute, Princeton University, Princeton, United States of America.