Because the frontal lobes and their connections were not injured, behavior and personality were not altered. Because of the case of HM, we now know to avoid bilateral resection. He forgets to pay several bills and forgets several business appointments. His wife reports that he appears depressed and is not his usually jovial self. He acts strangely and inappropriately, having an affair with a 15 year-old high school sophomore.
Neurological examination shows the following abnormalities.
Disorientation for year, month and day. Inability to remember 3 unrelated objects at 5 minutes. Inability to accurately draw geometric shapes. Concrete thought processes and inability to think abstractly. Responses Dementia, most likely of the pre-senile Alzheimer type.