'Practically all workers with an extensive experience are agreed that the main significance of leucotomy is that it is the most certain measure we have for reducing anxiety and tension which have existed for a long time. Much of the earlier work on the damage to the personality resulting from leucotomy is now of historical interest only'. Slater went on to say that the techniques had been refined and that most leucotomies did not involve such extensive invasion of the brain as in the past. He then said, 'The modern and more limited operations are enough to bring the needed relief to a wide range of patients, even though there are still some whose symptoms are so severe that something more will be required'.
'many patients, especially in the schizophrenic group fail to improve because of the severity of their mental illness'.He said,
'The operation may bring about a greater social accessibility but reveal an unsuspected degree of deterioration of personality and flattening of emotional responsiveness. Such defects in these cases should be attributed to their true cause, the sequelae of the schizophrenic process, and not in the absence of evidence laid to the discredit of the operation'.The article on Slater in the Oxford Dictionary of National Biography makes no mention of leucotomies.