We would like to thank Eva Dobler, Marc Garellek, Michelle St-Amour and Eva Sokol for their help in conducting the experiments. We also thank the children, administrators and parents at Children’s Corner, CPE McGill, Playskool, SSMU and YMCA Westmount daycares in Montreal and at the Scuola Materna S.Benedetto in Siena, where the experiments have been conducted. The research reported in this pap...