1 Functional Brain Diagnostics and Therapy, Department of Neurology, High Field MR Center, Medical University of Vienna, Spitalgasse 23, Vienna 1090, Austria. Electronic address: roland.beisteiner@meduniwien.ac.at.
2 Human Motor Control Section, NINDS, NIH, 10 Center Drive, Bethesda, MD 20892-1428, USA.