John Forbes Nash Jr.
Nash’s mental disturbances was a proess of change from “scientific rationality of thinking into the delusional thinking characteristic of persons who are psychiatrically diagnosed as “schizophrenic” or “paranoid schizophrenic” including seeing himself as a messenger or having a special function in some way, and with supporters and opponents and hidden schemers, and a feeling of being persecuted, and looking for signs representing divine revelation.
Nash has suggested his delusional thinking was related to his unhappiness, and his striving to feel important and be recognized, and to his characteristic way of thinking such that “I wouldn’t have had good scientific ideas if I had thought more normally.” He has said, “If I felt completely pressureless I don’t think I would have gone in this pattern”.
In the hospital, he renounced his “dream-like delusional hypotheses” after being in a hospital long enough to decide to superficially conform, behave normally or experience “enforced rationality”. Only gradually on his own did he “intellectually reject” some of the “delusionally influenced” and “politically-oriented” thinking as a waste of effort. However, by 1995, he felt that although he was “thinking rationally again in the style that is characteristic of scientists,” he felt more limited.