School of Informatics, University of Edinburgh, Edinburgh, Scotland, United Kingdom.|Faculty of Mathematics and Computer Science, University of Münster, Münster, Germany.|Department of Behaviour and Neuronal Biology, University of Münster, Münster, Germany.|Department of Behaviour and Neuronal Biology, University of Münster, Münster, Germany.|Faculty of Mathematics and Computer Science, University of Münster, Münster, Germany.