As the leading journal of neurology, Brain provides a forum for cutting-edge research and scholarship in all areas of the field, from basic neuroscience to clinical practice. With a distinguished editorial board and contributors from around the world, Brain is an essential resource for neurologists, neurosurgeons, psychiatrists, and other health professionals interested in the structure, function, and disorders of the brain. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.