I feel that our profession, software engineering, might actually cause this sort of problem. Like the movie 'Concussion' the hyper focus on solving logic problems might cause brain damage. I've experienced something like this after multi day long bouts of coding, where at the end I become incapable of understanding simple greetings from other people. It is like the 'social signal processor' part of my brain just shuts down.
And, it is this 'social signal processor' that helps keep me sane. God knows what I'd be like if I only lived in my own head 24/7. So, what kind of brain damage could it do to a person to become completely consumed by coding 24/7 (even though I'd love to do so)?
"The madman is the man who has lost everything except his reason." - GK Chesterton