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The concept of the three levels of the mind is nothing new. Sigmund Freud, the famous Austrian psychologist, was probably the first to popularize him in the dominant society as we know him today. Even though his theories have subsequently been widely discussed in psychology circles because they are tough to prove scientifically, Freud created a useful model of the mind, which he separated into 3 levels or sections: the conscious mind or the ego, the preconscious, and the unconscious mind.