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The popular media has offered such examples as "Eve" (based on Chris Costner-Sizemore) and "Sybil" (based on Shirley Ardell Mason) as sufferers of dissociative identity disorder (at one point known as multiple personality disorder). Doctors and psychotherapists have wrestled with how to help patients dealing with this diagnosis, but in reality, there is often doubt cast upon the validity of the symptoms.

Studies such as Boysen (2011) offer a retrospective analysis of the origins of symptoms and treatments presented in the literature in the 80s and 90s in an attempt to categorize the outcomes. However, there's no comparison with control cases, i.e., those who may have faced persistent, horrible abuse or other similar situations and not developed symptoms of the disorder.

Are there recent case control studies that have been done in this area of research? Is this careful retrospective analyis as far as we have progressed in determining whether these dissociative identities are a medical condition or artifacts of psychotherapy and popular press exposure?

Boysen, G.A. (2011) The scientific status of childhood dissociative identity disorder: A review of published research. Psychother Psychosom 2011;80:329-334. [DOI]

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Needs a well researched answer. Here's your chance! :) –  Chuck Sherrington Aug 13 '13 at 6:27
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Dissociative identity disorder is a medical condition .

Dissociative Identity Disorder is listed in the DSM-V.

H 02 Dissociative Identity Disorder
1. Disruption of identity characterized by two or more distinct personality states or an experience of possession. This involves marked discontinuity in sense of self and sense of agency, accompanied by related alterations in affect, behavior, consciousness, memory, perception, cognition, and/or sensory-motor functioning. These signs and symptoms may be observed by others or reported by the individual.
2. Recurrent gaps in the recall of everyday events, important personal information, and/or traumatic events that are inconsistent with ordinary forgetting.
3. The symptoms cause clinically significant distress or impairment in social, occupational, or other important areas of functioning.
4. The disturbance is not a normal part of a broadly accepted cultural or religious practice. (Note: In children, the symptoms are not attributable to imaginary playmates or other fantasy play.)
5. The symptoms are not attributable to the direct physiological effects of a substance (e.g., blackouts or chaotic behavior during Alcohol Intoxication) or another medical condition (e.g., complex partial seizures).

I have not found any recent case control studies.

I have found this paper reviewing the research from 2004-2006. Here childhood trauma, dissociation and psychosis are discussed and a study on the relationship between Schizophrenia and DID is discussed.

Dissociative identity disorder
Colin A. Ross MD
September 2006, Volume 4, Issue 3, pp 112-116
Current Psychosis and Therapeutics Reports

One issue with diagnosing personality disorders, is that the boundaries between them and other conditions can be blurred. So a person can have traits of several disorders/illnesses, and will be diagnosed with the one that is the best fit.

Personality disorders often co-occur with other mental illnesses. Harmful alcohol and other drug use often co-occurs with personality disorders, particularly borderline personality disorder. This makes treatment more complex, and effectively managing alcohol and other drug use is important.

Mental Health
Publications Department of Health and Ageing
Australian Government

Although dissociative phenomena have been discussed throughout the 20th century, the recognition of dissociative disorders as a bona fide diagnostic category is relatively recent. Nonetheless, the evidence linking attachment in infancy and attachment-related traumas to later dissociative symptoms, and the evidence linking concurrent states of mind with dissociative symptoms, converge to form a compelling picture.

Attachment and psychopathology in adulthood.
Dozier, Mary; Stovall-McClough, K. Chase; Albus, Kathleen E. Cassidy, Jude (Ed); Shaver, Phillip R. (Ed), (2008). Handbook of attachment: Theory, research, and clinical applications (2nd ed.).


The following is my personal ideas and conclusions about this topic; based on much personal research, formalised study and personal experience (of close relationship with a person with DID). see references below

It is an accepted practice that dissociation can occur and that there is a connection between childhood trauma (usually in the form of abuse). A healthy personality has multiple aspects and personas. The aspects are brought out during various life situations. From happy experiences, loss, stress; we see different traits of a personality surface. So it would follow that someone with extreme trauma and disruption to personality development, could have a fragmented personality, that changes under varying conditions.

The perception would be that the person has multiple personalities, which is a misnomer, in so much, that we are dealing with one individual with multiple states of consciousness and persona. Amnesia that results from the protective nature of the mind to protect the individual from trauma, with the stress and varying attitudes and roles that a child is forced to play to minimise damage in an abusive environment; acting out in response to coping with extreme trauma. This concoction would well produce a personality that would appear to "flip" and change, one of extremes, and with featured amnesia from one coping state to another.

I think Dissociative States Disorder would be a better name for this condition. As the Hollywood interpretation is one of extremes, and as Autism has a spectrum, (as many illnesses), so do Dissociative Disorders.

As for treatment, I don't believe it is possible for a person to fully recover from such a condition. There are just not enough years available to the human life to do so. When dealing with such extreme and prolonged trauma, it is most difficult for the patient to acknowledge consciously the source of the dissociation and overcome major trust issues to open up. Combined with the fact that damaged child, become damaged adults, who then make poor choices, that compounds poor mental health; this is a difficult condition to minister help.


Dissociation and childhood trauma in psychologically disturbed adolescents.
Sanders, Barbara; Giolas, Marina H.
The American Journal of Psychiatry, Vol 148(1), Jan 1991, 50-54

Prim Care Companion J Clin Psychiatry. 2000 April; 2(2): 37–41.
PMCID: PMC181202
Dissociative Spectrum Disorders in the Primary Care Setting
James L. Elmore, M.D.

Interpersonal functioning among women reporting a history of childhood sexual abuse: empirical findings and methodological issues
David DiLilloCorresponding author
University of Nebraska-Lincoln, Lincoln, NE, USA


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I am selecting this as the answer, but any further references to back up your position in the final paragraphs would be great (if you happen to run across them in your travels) –  Chuck Sherrington Aug 15 '13 at 14:27
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@Skippy Just make sure it's a "Smart" phone, otherwise it's just going to give you wrong advice. Oh, and don't rely on a GPS, unless you like giving your car a bath. –  Fred -ii- Aug 16 '13 at 14:35
    
@Skippy As in which ones? Do tell!!! –  Fred -ii- Aug 16 '13 at 14:42
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@skippy No, that's great! Thank you again. –  Chuck Sherrington Aug 16 '13 at 15:00
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