Freud's greatest contribution to personality theory is his exploration of the unconscious and his insistence that people are motivated primarily by droves of which they have little or no awareness. To Freud mental life is divided into two levels, the unconscious and the conscious. The unconscious, in turn, lias two different levels, the unconscious proper and the preconscious. In Freudian psychology the three levels of mental life are used to designate both a process and a location. The existence as a specific location, of course, is merely hypothetical and has no real existence within the body. Yet, Freud spoke of the unconscious as well as unconscious processes.
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