1. Human Cortical Physiology and Stroke Neurorehabilitation Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland;
2. Motor Performance Laboratory, Neurological Institute, Columbia University, New York, New York;
3. Mood and Anxiety Disorders Program, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland;
4. Department of Neurology, Albert-Ludwigs-University, Freiburg, Germany; and
5. Departments of Neurology and Neuroscience, Johns Hopkins University, Baltimore, Maryland