Multiple personality disorder is a mental disorder that could easily be described as having at least one differ alter ego that controls the behavior through out the day. An alter ego is a Latin word that means "the other I". It is more of a second self, which is believed to be distinct from a person's normal or original personality. A person who has an alter ego is said to lead a double confusing life. 
) The belief of consciousness, by which we identify our selves, is said to be absent in MPD. Another symptom of MPD is significant amnesia which can't be explained by ordinary forgetfulness. 
) Memory and other views of consciousness are said to be divided up among "alters" in the MPD. The total amount of "alters" identified by various therapists ranges from several to tens to hundreds. In most cases, they could be several thousand identities dwelling in one person. There does not seem to be any consensus among therapists as to what an "alter" is. Yet, there is general agreement that the cause of MPD is repressed memories of childhood sexual abuse. The evidence for this claim has been challenged, however, and there are very few reported cases of MPD afflicting children.
Do they really exist?
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physiologist feels that childhood abuse and MPD are maintained through social interactions. The Spanish has stood by their word that both the disease and the cure were put up by therapist.
This does not mean that MPD does not exist, but that its origin and development are often severe , if not most often, explicable without the model of separate but permeable ego-states or "alters" arising out of the ashes of a destroyed "original self."
These children have often been kept in such extraordinary terrifying and confusing circumstances that I am more amazed that they survive psychologically at all than I am thatthey manage to preserve themselves by a desperate redrawing of their boundaries. What they do, when confronted with overwhelming conflict and pain, is this: They "leave." They create a boundary so that the horror doesn't happen to them; it either happens to no one, or to someother self, better able to sustain its organization under such an onslaught--at least that's what they say they did, as best they recall''says Dr Denneth''.
Most personality disorder exist even in cultures but most times cannot be said to be mental disorder. The Spanos however feels that neither childhood sexual abuse nor mental disorders relating to MPD..
In a number of different historical and social contexts, people have learned to think of themselves as "possessing more than one identity or self, and can learn to behave as if they are first one identity and then a different identity." However, "people are unlikely to think of themselves in this way or to behave in this way unless their culture has provided models from whom the rules and characteristics of multiple identity enactments can be learned. Along with providing rules and models, the culture, through its socializing agents, must also provide legitimation for multiple self enactments...
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Great post mate! I like how you addressed whether the condition is or isn't real as I understand it's a contentious issue among psychiatrists :)
Thank you.