1. Swartz Center for Computational Neuroscience, Institute for Neural Computation, University of California San Diego, La Jolla, 92093 CA, USA
2. Université de Toulouse, UPS, Centre de Recherche Cerveau et Cognition, 31062 Toulouse, France
3. CNRS, CerCo, 31062 Toulouse, France
4. Department of Cognitive Science, University of California San Diego, La Jolla, 92093 CA, USA
5. Department of Neurosciences, School of Medicine, University of California San Diego, La Jolla, 92093 CA, USA