http://www.ncbi.nlm.nih.gov:80/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11681540&dopt=Abstract
Psychol Med 2001 Oct;31(7):1141-6
McNamara B, Ray JL, Arthurs OJ, Boniface S.
Department of Clinical Neurophysiology, Addenbrooke's Hospital, Cambridge.