1. Research Institute of Electrical Communication, Tohoku University, Sendai, 980-8577, Japan
2. Department of Psychology, St. Thomas University, Fredericton, E3B 5G3, Canada
3. Neurology Clinic, University of Freiburg, 79106 Freiburg, Germany
4. Wilhelm Wundt Institute for Psychology, University of Leipzig, 04109 Leipzig, Germany
5. Department of Human Science, Tohoku Gakuin University, Sendai, 981-3193, Japan