Functional magnetic resonance imaging (fMRI) has proved to be game-changing for understanding the brain. Through fMRI, patients in a persistent vegetative states have been able to communicate, and unconscious biases have been uncovered. Join Barbara Sahakian and Julia Gottwald as they explore how this technique could be used, and abused, in the future. Sahakian is Professor of Clinical Neuropsychology at the University of Cambridge; Gottwald is a PhD student.