We have studied a group of patients with supratentorial neuroepithelial tumors before and after surgical treatment. The main neuropsychological impairments were in verbal memory. After surgery, neuropsychological performance improved in 36.1%, worsened in 13.6% and remained the same in 29.7%. In 21.6%, normal performance had already been observed. The physiology of brain tumors make it difficult to distinguish between frontal and temporal symptoms. However, neuropsychological assessment in useful for maximizing the patient's social adjustment.