1. Child Study Center, Yale University, New Haven, CT 06520
2. Department of Psychology, University of Amsterdam, Amsterdam 1018WT, Netherlands
3. Department of Anthropology, University of California, Davis, Davis CA 95616
4. Department of Anthropology, Boston University, Boston, MA 02215
5. School of Psychology, University of Auckland, Auckland 1010, New Zealand
6. Division of Continuing Education, Harvard University, Cambridge, MA 02138