Institute of Cognitive Science, University of Osnabrück, Osnabrück, Germany.|Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.|Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.|Department of Computational Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.|Department of Computational Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.|Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.|Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.|Institute of Cognitive Science, University of Osnabrück, Osnabrück, Germany.