1. Dissociative Identity Disorder
Psychological Disorders
Mrs. Marsh

2. Definition
dissociative identity disorder - a dissociative disorder, formerly called multiple personality disorder, in which an individual develops more than one self or personality.

3. Associated Features Host The core personality.
The primary identity associated with their given name.
Usually passive and dependent.
Possibly also depressed or guilty.

4. Associated Features Alters The personalities.
Each has its own pattern of perceiving, thinking, and relating as well as its own style of behavior, personal history, and self-image.
Each may have different ages, races, levels of intelligence, affective styles, genders.

5. Associated Features
At different times, one of these identities or personality states takes control of the person’s behavior.
The other alters may actively perceive what is happening.
An alter may have access to memories of other alters.
The transition from one alter to another is triggered by psychosocial stress or a personally significant stimulus.

6. Prevalence
After a couple famous novels and books as well as broadening of the definition and inclusion in the DSM, cases of the disorder increased.
Between : A handful of cases were reported.
Since 1970: Cases have increased into the thousands.
Many wondered whether the increase in prevalence was due to overdiagnosis or people faking symptoms.
Many are still skeptical of the disorder.

7. Items from the Structured Clinical Interview for DSM-IV Dissociative Disorders-Revised
Scale
Item
Amnesia
Have you ever felt as if there were large gaps in your memory?
Depersonalization
Have you ever felt that you were watching yourself from a point outside of your body, as if you were seeing yourself from a distance (or watching a movie of yourself)?
Have you ever felt as if a part of your body or your whole being was foreign to you?
Have you ever felt as if you were two different people, one going through the motions of life, and the other part observing quietly?
Derealization
Have you ever felt as if familiar surroundings or people you knew seemed unfamiliar or unreal?
Have you ever felt puzzled as to what is real and what’s unreal in your surroundings?
Have you ever felt as if your surroundings or other people were fading away?
Identity confusion
Have you ever felt as if there was a struggle going on inside of you?
Have you ever felt confused as to who you are?
Identity alteration
Have you ever acted as if you were a completely different person?
Have you ever been told by others that you seem like a different person?
Have you ever found things in your possession (for instance, shoes) that belong to you, but you could not remember how you got them?

8. DSM-IV-TR
The presence of two or more distinct identities or personality states (each with its own relatively enduring pattern of perceiving, relating to, and thinking about the environment and self). 
At least two of these identities or personality states recurrently take control of the person's behavior. 
Inability to recall important personal information that is too extensive to be explained by ordinary forgetfulness. 
The disturbance is not due to the direct physiological effects of a substance (e.g., blackouts or chaotic behavior during Alcohol Intoxication) or a general medical condition (e.g., complex partial seizures). Note: In children, the symptoms are not attributable to imaginary playmates or other fantasy play.

9. Etiology
May have failed to develop an integrated and continuous sense of self because they were severely traumatized or abused in their childhood.
Alters develop as an escape from the horrors of their daily reality.
Most people with Dissociative Identity Disorder report having been victims of abuse.
However, most people who have been abused do not develop the disorder.
An unknown factor seems to predispose certain traumatized children to develop different personalities in response.
Abuse may also trigger alterations in brain functioning.

10. Treatment Therapy Similar to those who suffer PTSD.
Help to integrate the alters into a unified whole and develop adequate strategies to deal with the painful memories of the past and current stress.

11. Treatment Hypnosis Cognitive-behavioral therapy
To change the client’s dysfunctional attitudes and/or beliefs:
that the different parts of the self are separate selves
that the victim is responsible for the abuse
that it is wrong to show defiance
that the host cannot handle painful memories
that one of the alters hates the parents
that the host must be punished
that neither the self nor others can be trusted.

12. Prognosis Some positive outcomes. Example:
In a study of 135 individuals with the disorder, 54 were and reassessed after a 2 year period and continued to show significant improvement.