"If he had lived, Pribram's colleague would have experienced what neuroscientists call retrograde amnesia. This is the kind of amnesia that is most often dredged up as a plot element in bad comedies and cheap mystery stories; so-and-so gets hit on the head and then can't remember who he is anymore, wanders around aimlessly, finding himself in zany predicaments, until he gets hit on the head again and his memory remarkably returns. This almost never occurs in real life. Although retrograde amnesia is real, it's usually the result of a tumor, stroke, or other organic brain trauma. It isn't restored by a knock on the head. Because they can still form new memories, patients with retrograde amnesia are acutely aware that they have a cognitive deficit, are painfully knowledgeable about what they are losing."