He has lost his sense of humor. He curses constantly and does so in inappropriate circumstances. This case represents a classic example of frontal lobe injury. Located on the medial and undersurfaceof the frontal lobes is the limbic system. Dysfunction to the frontal lobe may result in profound behavioral abnormalities.
Modern neurosurgery is more advanced.
Because the injury spared the language, memory, motor, sensory, and visual cortex regions, there are no other neurological impairments. HM was a young man who developed epilepsy during his adolescence. He had multiple and recurrent seizures which persisted despite treatment with appropriate anti-epileptic medications. This was done because EEG showed abnormal electrical discharges arising from the temporal cortex. He became alert, attentive, and cooperative.