1. Department of Neurophysiology, Graduate School of Medicine, Akita University, Akita, Japan
2. Laboratory of Information Biology, Graduate School of Information Sciences Tohoku University, Sendai, Japan
3. Department of Neuroendocrinology, Graduate School of Medicine, Tohoku University, Sendai, Japan
4. Department of Cellular Neurobiology, Brain Research Institute, Niigata University, Niigata, Japan