1. Faculty of Life Sciences, Institute of Biology, Human Biology and Primate Cognition, Leipzig University, Talstrasse 33, 04103 Leipzig, Germany
2. Department of Comparative Cultural Psychology, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany
3. Department of Education and Psychology, Comparative Developmental Psychology, Freie Universität Berlin, Habelschwerdter Allee 45, 14195 Berlin, Germany
4. Faculty of Psychology, Institute of Psychology in Education, University of Münster, Fliednerstrasse 21, 48149 Münster, Germany