From the Center for Dementia and Alzheimer’s Care, Dept. of Neurology, HealthPartners, St. Paul, MN (MHR), the Ataxia Unit, Cognitive/Behavioral Neurology Unit, Dept. of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA (JDS), the Dept. of Neurology, McLean Hospital, Belmont, MA (BHP), and the Center for Law, Brain, and Behavior, Massachusetts General Hospital and Harvard Medical School, Boston, MA (BHP).