Intellectual functions in patients with lateralized frontal tumours.

Intracranial neoplasms have furnished the bulk of material for clinico-anatomical correlations of brain lesions and psychological abnormalities. While there is an enormous literature on clinical studies of patients with lateralized frontal tumours, the diver-sity of conclusions with respect to intellectual function reflects the numerous sources of ambiguity inherent in this clinical material (Smith, 1962b) and the subjective nature of clinical assessments. Despite the increasing introduction of systematic, objective, and controlled psychological studies of the effects of various types of brain lesions, there have been few such studies restricted to populations in which the site and nature of tumours had been based on neurosurgical and neuropathological