The generation of Parkinsonian tremor as revealed by directional coupling analysis D. A. Smirnov, U. B. Barnikol, T. T. Barnikol, B. P. Bezruchko, C. Hauptmann, C. Bührle, M. Maarouf, V. Sturm, H.-J. Freund and P. A. Tass EPL, 83 2 (2008) 20003 Published online: 10 July 2008 DOI: 10.1209/0295-5075/83/20003