1. NTT Communication Science Laboratories, Atsugi, Japan
2. Institute of Cognitive Neuroscience, University College London, London, United Kingdom
3. Center for Information and Neural Networks, National Institute for Information and Communications Technology, Osaka, Japan
4. UCL Queen Square Institute of Neurology, Department of Clinical and Movement Neurosciences, University College London, London, United Kingdom
5. Wellcome Centre for Human Neuroimaging, University College London, London, United Kingdom
6. Faculty of Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
7. Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan