k. C.. Braun. C.. Mersa It, Rosenstiel, Birbaumer. N.. KObkr. A.. 2007. An MEG-based brain-computer interface (80). Neuroimage 36. 581-593. Moran. D.W. Schwartz. A.B. 1999. Motor conical activity during drawing move- ments: population representation during spiral tracing. J. NeurophysioL 82. 2693-2704. Mull