Personal identity is singular. Belief in this self-existence presupposes all our conscious experiences. We all think that this identity belongs only to us. I speak about my experiences as lived by me. I would seem to be talking nonsense if I referred to myself in the plural or if I talked about the way in which the multiplicity of “selves” experienced an event. Although most submit to the existence of levels of consciousness, we categorize people who exhibit distinct personalities as non-ordinary. All popular theories of self-identity have the task of proving that it is a singular self. I will attempt to analyze current theories of self-identity and examine cases where the singular self-identity of normal individuals is called into question. Psychologists seeking to clarify this discussion have studied phenomena concerning the nature of self-identity and its relationship to consciousness. Philosophers can attempt to investigate the fundamental assumptions underlying these studies and examine their ramifications for our dogmas of identity. To formulate a concept of our self-concept, we must consider the uniqueness of our experience and take into account memories of previous experiences. . Personal identity is the property of a personal and distinct unity of consciousness that is consistent over time. The unity of consciousness is the personal, private, possessed, and discrete ongoing experience of the self. For example, I think I am. I believe that I am, neither in part nor in whole, someone other than the one I perceive that I am, and that this “I” was the same unity yesterday as today. I also deduce that I will be (if I wake up) tomorrow the continuation of the same me. This self that we assume does not exist...... middle of paper ....... Los Altos, CA. : Kaufman, 1983..Laurence, Jean-Roch, Perry, Campbell and Kihlstron, John. “Hidden observer” phenomena in hypnosis: an experimental creation? » Journal of Personality and Social Psychology. 44.1 (1993): 163-169. Sacks, Oliver. The man who mistook his wife for a hat: and other clinical tales. New York: Harper Perenial, 1985. Spanos, Nicholas P. “The Hidden Observer as an Experimental Creation” Journal of Personality and Social Psychology. 44.1 (1983): 170-176..Watkins, John G. & Watkins, Helen H. “Hypnosis, Multiple Personality, and Ego States” Handbook of States of Consciousness. Ed. Benjamin B. Wolman and Montague Ullman. New York: Van Nostrand, 1986..Wilkes, Kathleen V. “Fugues, hypnosis and multiple personalities” Self and identity: contemporary philosophical issues. Ed. Kolak, Daniel and Martin, Raymond. New York: MacMillan, 1991..