1. Physiology of Neuronal Networks, Department of Biology , University of Kaiserslautern , Erwin-Schrödinger-Straße 13 , D-67663 Kaiserslautern , Germany
2. Department of Biophysics , Saarland University, School of Medicine, Center for Integrative Physiology and Molecular Medicine (CIPMM) , D-66421 Homburg , Germany