1. Department of Engineering Informatics, Faculty of Information and Communication Engineering, Osaka Electro-Communication University, Osaka, Japan
2. Graduate School of Information Science and Engineering, Ritsumeikan University, Shiga, Japan
3. Molecular Neuroscience Research Center, Shiga University of Medical Science, Shiga, Japan
4. College of Information Science and Engineering, Ritsumeikan University, Shiga, Japan