1. Division of Psychology, University of Stirling, Stirling FK9 4LA, UK
2. Faculty of Science, Charles University, Viničná 7, 128 42 Prague 2, Czech Republic
3. Developmental Ethology and Cognitive Psychology Laboratory, Centre for Taste, Smell and Feeding Behaviour Science, UMR 6265 CNRS-Université de Bourgogne-Inra-AgroSup, Dijon, France