The mental disorder Dissociative Identity Disorder, also known as multiple personality disorder (MPD), is a mental disorder that has a very complex making. It is believed that this disorder begins when severe trauma undergoes during childhood. This severe trauma usually consists of repetitive sexual or emotional abuse. It is very common to experience mild dissociation in everyday life, this can be seen in getting lost in the moment or day dreaming.
Dissociative Identity Disorder is a severe form of this dissociation in which the brain that connects a person's sense of identity does not perform correctly. A sense of identity can be found in a person's memories, thoughts, actions, and feeling, but this is lost when one has Dissociative Identity Disorder. If one undergoes an experience that is especially traumatic and violent the brain may dissociate itself from the situation as a coping mechanism, this is how Dissociative Identity Disorder is created.
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Different personalities have control during different times, but it is hard for one personality to know that there are others or what the other personalities do. With Dissociative Identity Disorder, a person's memory fluctuates with the varying personalities allowing this selective memory.
Once a personality is changed, sex, race, and age can fluctuate with the personality. Each personality behavior differently in ways of talking to walking and can act differently around others. It is also believed that rather than switching completely another personality could be revealed to the person affected. This figure can force the effect to do and say things before switching. Switching personalities can take seconds or day, this is all dependent on the one affected by Dissociative Identity