We are revising the criteria in the Listing of Impairments (listings) that we use to evaluate disability claims involving neurological disorders in adults and children under titles II and XVI of the Social Security Act (Act). These revisions reflect our program experience; advances in medical knowledge, treatment, and methods of evaluating neurological disorders; comments we received from medical experts and the public at an outreach policy conference; responses to an advance notice of proposed rulemaking (ANPRM); and public comments we received in response to a Notice of Proposed Rulemaking (NPRM) and a Federal Register notice that reopened the NPRM comment period.