1. Department of Biopsychology, Institute of Cognitive Neuroscience, Faculty of Psychology, Ruhr-University Bochum, 44801 Bochum, Germany.
2. Department of Neurophysiology, Institute of Physiology, Faculty of Medicine, Ruhr-University Bochum, 44801 Bochum, Germany.
3. Cécile and Oskar Vogt Institute for Brain Research, Medical Faculty, Heinrich Heine University of Düsseldorf, 40225 Düsseldorf, Germany.
4. Institute for Biology II, RWTH Aachen University, 52074 Aachen, Germany.
5. Institute of Neuroscience and Medicine INM-1, Research Center Jülich, 52425 Jülich, Germany.