1. Department of Psychology, University of Warwick, University Road, Coventry CV4 7AL, UK
2. Experimental Psychology, University College London, 26 Bedford Way, London WC1H 0AP, UK
3. Department of Psychology, University of Michigan, 530 Church Street, Ann Arbor, MI 48109-1043, USA
4. Center for Adaptive Rationality, Max Planck Institute for Human Development, Lentzeallee 94, 14195 Berlin, Germany