1. School of Engineering and Science, Jacobs University Bremen, Bremen, Germany
2. School of Computing Science, Newcastle University, Claremont Tower, Newcastle upon Tyne NE1 7RU, UK
3. Institute of Neuroscience, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
4. Department of Computational Neuroscience, University Medical Center Eppendorf, Hamburg, Germany
5. Department of Health Sciences, Boston University, Boston, MA, USA