1. Centre de Recherches sur la Cognition Animale, Université de Toulouse; UPS, 118 route de Narbonne, Toulouse Cedex 9 31062, France
2. Centre de Recherches sur la Cognition Animale, CNRS, 118 route de Narbonne, Toulouse Cedex 9 31062, France
3. Department of Physiology, Monash University, Clayton, Victoria 3800, Australia
4. School of Media and Communication, Royal Melbourne Institute of Technology, Melbourne, Victoria 3000, Australia