I remember vividly watching a fantastic documentary about a rich miner was injured by a splinter that went through his bran. He survived, but through time he became an immoral man. Cutting things short, this was a debate of "is the cup half full or half empty" where did he become an immoral man after his injury to the brain due to the injury itself or the circumstances that arose after the event? Maybe he became irritable, pained, and the wifes tolerance of his complaints diminished through time, and this influenced his morality psychologically. One would not know. But bottomline is, his morality changed. Sorry I cannot remember who this was, so if you like you could dismiss this story. If I do find out who it was I will provide the source.