Eleven: When I was in there, I saw something. There was blood. So much blood. Brenner: That was another memory, a... a more powerful one, invading from your subconscious. You have demons, Eleven. You have demons in your past. That is why we must proceed carefully.
Do you know what happens when someone has a stroke? The blood supply to the brain is cut off. It scrambles the signals in the brain to the point where the mind can forget how to do things. To eat. To speak. To walk.