1 Vanderbilt Law School and Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37203, MacArthur Foundation Research Network on Law and Neuroscience, Nashville, Tennessee 37203, Department of Psychology, Vanderbilt University, Nashville, Tennessee 37203, Department of Psychology, Center for Neuroscience & Society, University of Pennsylvania, Philadelphia, Pennsylvania 19104, and Stanford Law School, Center for Law and the Biosciences, Stanford University, Stanford, California 94305.