1 Section Computational Sensomotorics, Hertie Institute for Clinical Brain Research and Centre for Integrative Neurocience, University of Tuebingen, Tuebingen, Germany.
2 Laboratory of Systems Neuroscience, Graduate School of Life Sciences, Tohoku University, Sendai, Japan.
3 Department of Bioengineering, School of Engineering, The University of Tokyo, Tokyo, Japan.
4 Department of Neurophysiology, Institute of Physiology, Eberhard Karls University of Tuebingen, Tuebingen, Germany.