Middle School Playground

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Multiple personality disorder (MPD) is a psychiatric disorder characterized by having at least one "alter" personality that controls behavior. The "alters" are said to occur spontaneously and involuntarily, and function more or less independently of each other. The unity 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. In 1994, the American Psychiatric Association's DSM-IV replaced the designation of MPD with DID: dissociative identity disorder. The label may have changed, but the list of symptoms remained essentially the same.