1. Faculty of Engineering, Maebashi Institute of Technology, Maebashi, Gunma 371-0816, Japan
2. School of Mathematics, Physics and Computing, University of Southern Queensland, Toowoomba 4350, Australia
3. School of Psychology, Capital Normal University, Beijing 100048, China
4. Beijing International Collaboration Base on Brain Informatics and Wisdom Services, Beijing University of Technology, Beijing 100124, China