1. Behavioural and Clinical Neuroscience Institute and Department of Experimental Psychology and Department of Psychiatry, University of Cambridge, Cambridge, CB2 3EB and CB2 0SZ, UK.
2. Wolfson Brain Imaging Centre, Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK.
3. Clinical Unit Cambridge, GlaxoSmithKline, Addenbrooke’s Centre for Clinical Investigations, Cambridge CB2 2GG, UK.
4. Cambridgeshire and Peterborough Foundation, National Health Service Trust, Cambridge CB21 5EF, UK.