1. Department of Psychology, Ritsumeikan University Toji-in Kitamachi, Kita-ku, Kyoto 603-8577, Japan
2. Facoltà di Lingue e Letterature Straniere, University of Sassari, via Roma 151, I 07100 Sassari, Italy
3. Biomedical Area, CRS4 in Sardinia, Loc. Pixina Manna Edificio 1, CP 25, I 09010 Pula (CA), Italy