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Dissociative identity disorder (DID), previously known as multiple personality disorder (MPD),,is a mental disorder on the dissociative spectrum characterized by the appearance of at least two distinct and relatively enduring identities or dissociated personality states that alternately control a person's behavior, accompanied by memory impairment for important information not explained by ordinary forgetfulness. These symptoms are not accounted for by substance abuse, seizures, other medical conditions, nor by imaginative play in children. Diagnosis is often difficult as there is considerable comorbidity with other mental disorders. Malingeringshould be considered if there is possible financial or forensic gain, as well as factitious disorder if help-seeking behavior is prominent.

DID is one of the most controversial psychiatric disorders, with no clear consensus regarding its diagnosis or treatment.[3] Research on effectiveness of treatment has been concerned primarily with clinical approaches andcase studies. Dissociative symptoms range from common lapses in attention, becoming distracted by something else, and daydreaming, to pathological dissociative disorders. No systematic, empirically-supporteddefinition of "dissociation" exists. It is not the same as schizophrenia.