1. Faculty of Intelligence and Informatics, Konan University, Kobe, Hyogo, 658-8501, Japan
2. Brain Activity Imaging Center, ATR-Promotions Incorporated, Seika-cho, Soraku-gun, Kyoto, 619-0288, Japan
3. Department of Communication Sciences and Disorders, Faculty of Health and Welfare, Prefectural University of Hiroshima, Mihara, Hiroshima, 723-0053, Japan
4. The Japan Foundation, Japanese-Language Institute, Urawa, Saitama city, Saitama, 330-0074, Japan, , ,