1. Decision Neuroscience Laboratory, 2Beckman Institute for Advanced Science and Technology, 3Department of Internal Medicine, 4Department of Psychology, 5Department of Speech and Hearing Science, 6Neuroscience Program, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USA, 7Universidad Autónoma de Madrid, Fundación CIEN/Fundación Reina Sofía, Madrid, Spain, and 8Rehabilitation Institute of Chicago, Chicago, IL 60611, USA