1. Department of Linguistics Simon Fraser University Burnaby BC Canada
2. Department of Psychology Simon Fraser University Burnaby BC Canada
3. Department of Human Behavior, Ecology and Culture Max Planck Institute for Evolutionary Anthropology Deutscher Platz 6 Leipzig 04103 Germany
4. Integrative Neuroscience and Cognition Center UMR 8002 Centre national de la recherche scientifique (CNRS) & Université de Paris Paris 75006 France