1. Department of Psychology, Faculty of Humanities, Niigata University, 2-8050 Ikarashi, Nishi-ku, Niigata 950-2181, Japan
2. Faculty of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan
3. Japan Society for the Promotion of Science, Fukuoka 815-8540, Japan