Sergio Pellis is a professor in the Department of Neuroscience at the University of Lethbridge, Alberta, Canada. Vivien Pellis was an adjunct professor and is a research associate in the Department of Neuroscience at the University of Lethbridge, Alberta, Canada. Between them, the authors have published more than 250 scientific journal articles and chapters, along with a book titled The Playful Brain : Venturing to the Limits of Neuroscience (Oneworld Publications, 2009).