1. Department of Psychology, Durham University, Science Laboratories, South Road, Durham, DH1 3LE, UK
2. Institute of Cognitive Neuroscience, University College London, 17–19 Queen Square, London, WC1N 3AR, UK
3. Faculty of Psychology and Education Sciences, University of Porto, Rua Alfredo Allen, 4200-135 Porto, Portugal
4. Department of Psychology, University of Westminster, 115 New Cavendish Street, London, W1W 6UW, UK
5. Department of Experimental Psychology, University of Oxford, S Parks Rd, Oxford OX1 3UD, UK