Nash began experiencing mental disturbances in 1959. He explained that at the time his wife was pregnant when began experiencing a change from a scientifically rational way of thinking to delusional thinking. Among the symptoms, he experienced included hallucinations since he reported hearing voices. He also experienced delusion and disorganization of both thought and speech. As his condition worsened, the symptoms strengthened to include impairment in social cognition and social withdrawal. The symptoms evolved to paranoia as he began feeling that some people posed meant to harm him. He could not identify the people yet the feeling kept intensifying (Brown, 2013).