1 Institut Jean Nicod, Ecole des Hautes Etudes en Sciences Sociales, Departement d'Etudes Cognitives-Ecole Normale Supérieure, Centre National de la Recherche Scientifique, 29 rue d'Ulm, Paris 75005, France.
Human infants evaluate social interactions well before they can speak, and show a preference for characters that help others over characters that are not cooperative or are hindering.