A biological shift happens in the brain, and it affects every part of daily life, including judgment, freedom of thought and spatial perception of oneself. Basically, the brain cells die. You certainly can't compare a person's condition at that stage to what it was when they had 20, 30 or 40% more brain cells.
Alzheimer's is a neurodegenerative disease. That's why I said in my opening remarks that I didn't want us to discuss psychiatric illness at all. That's a completely different situation. I would not have the same sort of stance I had this morning.
Alzheimer's is an incurable disease; the cells die. If you do a CT scan, you can actually see the dead cells, which are shrivelled up.