1. Perception-in Action Laboratories, University of Edinburgh, Edinburgh EH8 8AQ, Scotland, UK
2. UMR 6233 Institut des Sciences du Mouvement E. J. Marey, Université de la Méditerranée, 163 avenue de Luminy—CP 910, Marseille, France
3. School of Life Sciences, University of Sussex, Brighton BN1 9QG, UK
4. Centre for Vision Research, Department of Psychology, York University, North York, Ontario M3J 1P3, Canada
5. Department of Applied Psychology, Arizona State University, Sutton 340J, 7001 East Williams Field Road, Mesa, AZ 85212, USA