1. Department of Neurophysiology, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo 187-8502, Japan.
2. Department of Developmental Physiology, National Institute for Physiological Sciences, National Institute of Natural Sciences, Okazaki, Aichi 444-8585, Japan.
3. Department of Neuroscience, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan.
4. Human Brain Research Center, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan.
5. Institute for the Advanced Study of Human Biology (WPI-ASHBi), Kyoto University, Kyoto 606-8501, Japan.
6. School of Life Science, The Graduate University for Advanced Studies (SOKENDAI), Hayama, Kanagawa 240-0193, Japan.
7. Neural Prosthesis Project, Department of Dementia and Higher Brain Function, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan.
8. PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan.