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Liebal,  Katja
Department of Education and Psychology, Evolutionary Psychology/Languages of Emotion, Freie Universitat Berlin, Berlin, Germany;
Department of Psychology, University of Portsmouth, Portsmouth, UK;
Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

Haun,  Daniel B. M.       
Department of Psychology, University of Portsmouth, Portsmouth, UK;
Max Planck Research Group for Comparative Cognitive Anthropology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;