Gatsby Computational Neuroscience Unit, University College London, London, United Kingdom.|Center for Studies in Behavioral Neurobiology, Concordia University, Montreal, Canada.|Center for Studies in Behavioral Neurobiology, Concordia University, Montreal, Canada.|Center for Studies in Behavioral Neurobiology, Concordia University, Montreal, Canada.|Department of Experimental Psychology, University of Oxford, Oxford, United Kingdom.|Center for Studies in Behavioral Neurobiology, Concordia University, Montreal, Canada.|Gatsby Computational Neuroscience Unit, University College London, London, United Kingdom.