What happens to a human being, when it is controlled, forced to be in a particular way, brainwashed?
One thing is, the man feels being excluded. The way he is, he is not allowed to be. There is no space, there is no time to be what he is.
Consequently from that, protection system makes him exclusive towards everything, which external to him. Another thing that happens is, his life sensitivity is lowered, just to allow him to still survive in an exclusive atmosphere.
Have you ever tried to do something with a numb limb? The same happens to the entire human system. Survival is still possible, but sensible and intelligent life becomes out of reach.
If you leg is numb, and you remove whatever obstacle that caused that, it will take time for the limb to come to normal state. If your whole body was frozen, it involves much more complex process and more time to recover and come to senses. If the damage is even deeper, it may take who knows how much time and effort to bring such a human being back to life.