This wonderful article describes the power of the human mind to examine itself.
http://www.latimes.com/health/la-he-brain-20100830,0,479095.story?
“The idea that there may be a physical structure in the brain in which we unconsciously define who we are ‘would warm Freud’s heart,’ says Dr. Marcus E. Raichle, a neurologist at Washington University in St. Louis who has pioneered work in this fledgling field. Sigmund Freud, the Austrian father of modern psychiatry, spoke exhaustively of the power of the unconscious mind in shaping our behavior and often surmised that the workings of that force would someday be revealed by scientists.”