1. Neuroinformatics Doctoral Training Centre and Institute for Adaptive and Neural Computation, School of Informatics, University of Edinburgh, Edinburgh EH8 9AB, U.K.
2. Centre for Integrative Physiology, University of Edinburgh, Edinburgh EH8 9XD, U.K.
3. Institute for Adaptive and Neural Computation, School of Informatics, University of Edinburgh, Edinburgh EH8 9AB, U.K.