Thomas Parr is a Postdoctoral Scholar at the Wellcome Centre for Human Neuroimaging at the Queen Square Institute of Neurology at University College London and a practicing clinician. Giovanni Pezzulo is a Researcher at the Institute of Cognitive Sciences and Technologies of the National Research Council of Italy in Rome. Karl J. Friston is Scientific Director of the Wellcome Centre for Human Neuroimaging and Professor at Queen Square Institute of Neurology at University College London.