1. Neuroelectronics, Munich School of Bioengineering, Department of Electrical and Computer Engineering, Technical University of Munich, Boltzmannstrasse 11, 85748 Garching, Germany
2. Medical & Health Informatics Laboratories, NTT Research Incorporated, 1950 University Ave. Suite 600 East Palo Alto, California 94303, USA
3. Chair of Zoology, Technical University of Munich, Liesel-Beckmann-Strasse 4, 85354 Freising Weihenstephan, Germany
4. Institute of Biological Information Processing, Bioelectronics (IBI-3), Forschungszentrum Jülich, 52425 Jülich, Germany