[1] Inst Psychiat, Div Psychol Med, London, England
[2] Inst Psychiat, Sect Cognit Psychopharmacol, London, England
[3] Inst Psychiat, Dept Psychol, London, England
[4] Univ Lancaster, Dept Psychol, Lancaster LA1 4YF, England
[5] Clin Neurosci Res Ctr, Dartford, England