1. Department of Linguistic and Cultural Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig 04103, Germany.
2. Department of Linguistics, University of Colorado Boulder, Boulder, CO 80309, USA.
3. Evolution of Cultural Diversity Initiative, School of Culture, History and Language, College of Asia and the Pacific, The Australian National University, Canberra, ACT 2601, Australia.
4. Department of English and American Studies, Friedrich-Schiller University of Jena, Jena 07745, Germany.
5. School of Psychology, University of Auckland, 1010 Auckland, New Zealand.
6. School of Biological Sciences, University of Auckland, 1010 Auckland, New Zealand.
7. Department of Human Evolutionary Biology, Peabody Museum, Harvard University, Cambridge, MA 02138, USA.
8. Human Relations Area Files, Yale University, New Haven, CT 06520, USA.