Department of Basic Neuroscience, University of Geneva, Geneva, Switzerland, Center of Learning and Memory and Department of Neuroscience, The University of Texas at Austin, Austin, Texas, United States of America.|Department of Basic Neuroscience, University of Geneva, Geneva, Switzerland.|Dominick Purpura Department of Neuroscience Albert Einstein College of Medicine, Bronx, New York, United States of America, Department of Ophthalmology and Visual Sciences, Albert Einstein College of Medicine, Bronx, New York, United States of America.|Department of Basic Neuroscience, University of Geneva, Geneva, Switzerland, Department of Brain and Cognitive Sciences, University of Rochester, Rochester, New York, United States of America, Gatsby Computational Neuroscience Unit, London, United Kingdom.