>>12453002Psychology is mostly guessing and sadly prone to society fashion.
Insanity is doing something over and over and expecting a different result. Some people that have their head fried can no longer form lessons or gain new experiences or some shit. But the classic insanity case is typically just people doing repetitive actions to sooth themselves and they're not particularly expecting different results. Others are just desperately trying to go back to a previous state. Like shooting up heroin as a means of getting their life back together.
The DSM5 has a whole pile of different sorts of "crazy" though. But like I said, it's mostly fashion.