Hypofrontality in neuroleptic-naive patients and in patients with chronic schizophrenia. Assessment with xenon 133 single-photon emission computed tomography and the Tower of London. - Andreasen,N.C.; Rezai,K.; Alliger,R.; Swayze,V.Wd.; Flaum,M.; Kirchner,P.; Cohen,G.; O'Leary,D.S. (Arch Gen Psychiatry, 1992)