This paper describes a new frontal lobe operation in which there is a bilateral excision of the cerebral tissue anterior to the site of the usual prefrontal lobotomy incision. This operation was performed on thirty-two of the most severe cases of chronic schizophrenia in a state hospital. The most striking results were obtained in the elimination or reduction of assaultiveness and soiling. There was little if any improvement in mental content. There were minimal changes found in the cells scattered throughout the excised portion of the frontal lobe.