Earlier quoted context omitted.
Absolutely agreed. Brains are bizarre. My mother-in-law once had what we (and her primary physician) believed was a serious flu. The moment we realized that it was much worse than that was when she started calmly speaking total nonsense. She appeared to think it was normal English, but each word was unintelligible, though it used plausible parts of speech. At that moment I picked her up and drove her to the E.R., aft…
Which reminds me, I should mention that for anybody with an elderly relative who experiences a sudden decline in the direction of delirium or dementia: make sure they don't have a urinary tract infection. I have no idea how that plumbing is connected, but I have seen it happen myself, and apparently it's a not-uncommon experience for people with Alzheimer's: https://www.alzheimers.net/2014-04-03/connection-between-ut…
In the case of my late mother, it manifested as a fixation on and paranoia about money.
Definitely one to bear in mind.