Matthias Zunhammer1, Ulrike Bingel2, Tor D Wager3. 1. Klinik für Neurologie, Universitätsklinikum Essen, Hufelandstraße 55, 45147 Essen, Germany. Electronic address: matthias.zunhammer@uk-essen.de. 2. Klinik für Neurologie, Universitätsklinikum Essen, Hufelandstraße 55, 45147 Essen, Germany. 3. Department of Psychology and Neuroscience, University of Colorado, Boulder, 345 UCB, Boulder, CO, USA; The Institute of Cognitive Science, University of Colorado, Boulder, 345 UCB, Boulder, CO, USA.