How do we distinguish the activity of one or more neurons in a set of recorded neural activity? How do we assign spikes to different neurons? What mathematical, computational tools are available to sort spikes? These questions, among others, informed a three-day-long training on spike sorting that FAPESP's Research, Innovation and Dissemination Center for Neuromathematics (CEPID NeuroMat) hosted at the University of São Paulo at the end of November (25-27), 2014, with Prof. Christian Pouzat, a researcher of the Applied Maths Laboratory of the Paris-Descartes University and a specialist in spike sorting.