1. United Graduate School of Child Development, Osaka University, Kanazawa University, Hamamatsu University School of Medicine, Chiba University, and University of Fukui, Osaka, Japan
2. Research Center for Child Mental Development, Chiba University, Chiba, Japan
3. Center for the Study of Human Nature, Fullerton, CA, USA
4. Department of Psychology, University of Texas at Austin, TX, USA