ONE OF the basic questions in an evaluation of prefrontal lobotomy is its effect on the intellectual functions in man. There is present in the literature a vast amount of material on this general problem, but, despite the quantity, there is little agreement on the fundamental points. Even on the basis of objective tests an evaluation of prefrontal lobotomy is complicated by conflicting results.
From their investigations, Malmo,1 Petrie,2 Yacorzynski and associates,3 and Rylander4 reported a loss in intelligence test scores, while no gross decrease was noted in the studies done by Frank,5 Hunt,6 McKenzie and Proctor,7 and Robinson.8 On the other hand, Carscallen and associates9 and Oltman and associates10 stated that there is a general rise in intellectual functioning above the preoperative level, whereas the Columbia Greystone Study,11 Hebb,12 and Lidz13 observed no significant differences.
STRUCKETT PBA. EFFECT OF PREFRONTAL LOBOTOMY ON INTELLECTUAL FUNCTIONING IN CHRONIC SCHIZOPHRENIA. AMA Arch NeurPsych. 1953;69(3):293-304. doi:10.1001/archneurpsyc.1953.02320270014002