dissociative disorders

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Dissociative Disorders



The dissociative disorders are a group of mental disorders that affect consciousness defined as causing significant interference with the patient's general functioning, including social relationships and employment.


In order to have a clear picture of these disorders, dissociation should first be understood. Dissociation is a mechanism that allows the mind to separate or compartmentalize certain memories or thoughts from normal consciousness. These split-off mental contents are not erased. They may resurface spontaneously or be triggered by objects or events in the person's environment.
Dissociation is a process that occurs along a spectrum of severity. It does not necessarily mean that a person has a dissociative disorder or other mental illness. A mild degree of dissociation occurs with some physical stressors; people who have gone without sleep for a long period of time, have had "laughing gas" for dental surgery, or have been in a minor accident often have brief dissociative experiences. Another commonplace example of dissociation is a person becoming involved in a book or movie so completely that the surroundings or the passage of time are not noticed. Another example might be driving on the highway and taking several exits without noticing or remembering. Dissociation is related to hypnosis in that hypnotic trance also involves a temporarily altered state of consciousness. Most patients with dissociative disorders are highly hypnotizable.
People in other cultures sometimes have dissociative experiences in the course of religious (in certain trance states) or other group activities. These occurrences should not be judged in terms of what is considered "normal" in the United States.
Moderate or severe forms of dissociation are caused by such traumatic experiences as childhood abuse, combat, criminal attacks, brainwashing in hostage situations, or involvement in a natural or transportation disaster. Patients with acute stress disorder, post-traumatic stress disorder (PTSD), or conversion disorder and somatization disorder may develop dissociative symptoms. Recent studies of trauma indicate that the human brain stores traumatic memories in a different way than normal memories. Traumatic memories are not processed or integrated into a person's ongoing life in the same fashion as normal memories. Instead they are dissociated, or "split off," and may erupt into consciousness from time to time without warning. The affected person cannot control or "edit" these memories. Over a period of time, these two sets of memories, the normal and the traumatic, may coexist as parallel sets without being combined or blended. In extreme cases, different sets of dissociated memories may alter subpersonalities of patients with dissociative identity disorder (multiple personality disorder).
The dissociative disorders vary in their severity and the suddenness of onset. It is difficult to give statistics for their frequency in the United States because they are a relatively new category and are often misdiagnosed. Criteria for diagnosis require significant impairment in social or vocational functioning.

Dissociative amnesia

Dissociative amnesia is a disorder in which the distinctive feature is the patient's inability to remember important personal information to a degree that cannot be explained by normal forgetfulness. In many cases, it is a reaction to a traumatic accident or witnessing a violent crime. Patients with dissociative amnesia may develop depersonalization or trance states as part of the disorder, but they do not experience a change in identity.

Dissociative fugue

Dissociative fugue is a disorder in which a person temporarily loses his or her sense of personal identity and travels to another location where he or she may assume a new identity. Again, this condition usually follows a major stressor or trauma. Apart from inability to recall their past or personal information, patients with dissociative fugue do not behave strangely or appear disturbed to others. Cases of dissociative fugue are more common in wartime or in communities disrupted by a natural disaster.

Depersonalization disorder

Depersonalization disorder is a disturbance in which the patient's primary symptom is a sense of detachment from the self. Depersonalization as a symptom (not as a disorder) is quite common in college-age populations. It is often associated with sleep deprivation or "recreational" drug use. It may be accompanied by "derealization" (where objects in an environment appear altered). Patients sometimes describe depersonalization as feeling like a robot or watching themselves from the outside. Depersonalization disorder may also involve feelings of numbness or loss of emotional "aliveness."

Dissociative identity disorder (did)

Dissociative identity disorder (DID) is the newer name for multiple personality disorder (MPD). DID is considered the most severe dissociative disorder and involves all of the major dissociative symptoms.

Dissociative disorder not otherwise specified (ddnos)

DDNOS is a diagnostic category ascribed to patients with dissociative symptoms that do not meet the full criteria for a specific dissociative disorder.

Causes and symptoms

The moderate to severe dissociation that occurs in patients with dissociative disorders is understood to result from a set of causes:
  • an innate ability to dissociate easily
  • repeated episodes of severe physical or sexual abuse in childhood
  • the lack of a supportive or comforting person to counteract abusive relative(s)
  • the influence of other relatives with dissociative symptoms or disorders
The relationship of dissociative disorders to childhood abuse has led to intense controversy and lawsuits concerning the accuracy of childhood memories. The brain's storage, retrieval, and interpretation of memories are still not fully understood. Controversy also exists regarding how much individuals presenting dissociative disorders have been influenced by books and movies to describe a certain set of symptoms (scripting).
The major dissociative symptoms are:


Amnesia in a dissociative disorder is marked by gaps in a patient's memory for long periods of time or for traumatic events. Doctors can distinguish this type of amnesia from loss of memory caused by head injuries or drug intoxication, because the amnesia is "spotty" and related to highly charged events and feelings.


Depersonalization is a dissociative symptom in which the patient feels that his or her body is unreal, is changing, or is dissolving. Some patients experience depersonalization as being outside their bodies or watching a movie of themselves.


Derealization is a dissociative symptom in which the external environment is perceived as unreal. The patient may see walls, buildings, or other objects as changing in shape, size, or color. In some cases, the patient may feel that other persons are machines or robots, though the patient is able to acknowledge the unreality of this feeling.

Identity disturbances

Patients with dissociative fugue, DDNOS, or DID often experience confusion about their identities or even assume new identities. Identity disturbances result from the patient having split off entire personality traits or characteristics as well as memories. When a stressful or traumatic experience triggers the reemergence of these dissociated parts, the patient may act differently, answer to a different name, or appear confused by his or her surroundings.


When a doctor is evaluating a patient with dissociative symptoms, he or she will first rule out physical conditions that sometimes produce amnesia, depersonalization, or derealization. These physical conditions include epilepsy, head injuries, brain disease, side effects of medications, substance abuse, intoxication, AIDS, dementia complex, or recent periods of extreme physical stress and sleeplessness. In some cases, the doctor may give the patient an electroencephalogram (EEG) to exclude epilepsy or other seizure disorders.
If the patient appears to be physically normal, the doctor will rule out psychotic disturbances, including schizophrenia. In addition, doctors can use some psychological tests to narrow the diagnosis. One is a screener, the Dissociative Experiences Scale (DES). If the patient has a high score on this test, he or she can be evaluated further with the Dissociative Disorders Interview Schedule (DDIS) or the Structured Clinical Interview for DSM-IV Dissociative Disorders (SCID-D). It is also possible for doctors to measure a patient's hypnotizability as part of a diagnostic evaluation.


Treatment of the dissociative disorders often combines several methods.


Patients with dissociative disorders often require treatment by a therapist with some specialized understanding of dissociation. This background is particularly important if the patient's symptoms include identity problems. Many patients with dissociative disorders are helped by group as well as individual treatment.


Some doctors will prescribe tranquilizers or anti-depressants for the anxiety and/or depression that often accompany dissociative disorders. Patients with dissociative disorders are, however, at risk for abusing or becoming dependent on medications. As of 2001, there is no drug that can reliably counteract dissociation itself.


Hypnosis is frequently recommended as a method of treatment for dissociative disorders, partly because hypnosis is related to the process of dissociation. Hypnosis may help patients recover repressed ideas and memories. Therapists treating patients with DID sometimes use hypnosis in the process of "fusing" the patient's alternate personalities.


Prognoses for dissociative disorders vary. Recovery from dissociative fugue is usually rapid. Dissociative amnesia may resolve quickly, but can become a chronic disorder in some patients. Depersonalization disorder, DDNOS, and DID are usually chronic conditions. DID usually requires five or more years of treatment for recovery.

Key terms

Amnesia — A general medical term for loss of memory that is not due to ordinary forgetfulness. Amnesia can be caused by head injuries, brain disease, or epilepsy, as well as by dissociation.
Depersonalization — A dissociative symptom in which the patient feels that his or her body is unreal, is changing, or is dissolving.
Derealization — A dissociative symptom in which the external environment is perceived as unreal.
Dissociation — A psychological mechanism that allows the mind to split off traumatic memories or disturbing ideas from conscious awareness.
Fugue — A dissociative experience during which a person travels away from home, has amnesia for their past, and may be confused about their identity but otherwise appear normal.
Hypnosis — The means by which a state of extreme relaxation and suggestibility is induced: used to treat amnesia and identity disturbances that occur in dissociative disorders.
Multiple personality disorder (MPD) — An older term for dissociative identity disorder (DID).
Trauma — A disastrous or life-threatening event that can cause severe emotional distress, including dissociative symptoms and disorders.


Since the primary cause of dissociative disorders is thought to involve extended periods of humanly inflicted trauma, prevention depends on the elimination of child abuse and psychological abuse of adult prisoners or hostages.



Eisendrath, Stuart J. "Psychiatric Disorders." In Current Medical Diagnosis and Treatment, 1998, edited by Stephen McPhee, et al., 37th ed. Stamford: Appleton & Lange, 1997.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

dissociative disorders

a group of mental disorders characterized by a sudden, temporary change in consciousness, identity, memory, or motor behavior so that some part or more of these functions is lost. The defense mechanism of dissociation underlies these disorders and any organic basis for the changes must be ruled out. Dissociative disorders are uncommon and often bizarre defensive reactions to stress. They are complex and difficult to distinguish from each other. The commonality is a cluster of related mental events that are beyond the patient's recall but can spontaneously return to conscious awareness. The category includes: dissociative amnesia, dissociative fugue, dissociative identity disorder, and depersonalization disorder.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

dis·so·ci·a·tive dis·or·ders

a group of mental disorders characterized by disturbances in the functions of identity, memory, consciousness, or perception of the environment; this diagnostic group includes dissociative (older term, psychogenic) amnesia, dissociative fugue, dissociative identity (older term, multiple personality) disorder, and depersonalization disorder.
Farlex Partner Medical Dictionary © Farlex 2012

dis·so·ci·a·tive dis·or·ders

(di-sōsē-ă-tiv dis-ōrdĕrz)
Group of mental states characterized by disturbances in the functions of identity, memory, consciousness, or perception of the environment.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

dissociative disorders

A group of extreme DEFENCE MECHANISMS which include loss of memory for important personal details (amnesia), wandering away from home and the assumption of a new identity (fugue), splitting of the personality into two distinct personalities and trance-like states with severely reduced response to external stimuli.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
References in periodicals archive ?
These divergences in diagnosis, as well as the debates between mentalists and behaviorists, between psychodinamically oriented and biologically oriented clinicians, between cognitive researchers and clinical researchers and practitioners, demonstrate the controversial nature of these dissociative disorders (1).
Berkowitz et al., "Dissociative disorders in psychiatric inpatients," The American Journal of Psychiatry, vol.
developed a brief scale, which proved to be useful for screening dissociative disorders. By using regression analysis methods, they identified five SDQ-20 items (items 4, 8, 13, 15, and 18) that provided optimal discrimination between dissociative disorders and other mental disorders, constituting the SDQ-5.
The most common co-morbidities were depression (50%) and dissociative disorders (48.3%).
DID falls in the section of dissociative disorders in the DSM-IV-TR; as the section title suggests, the key clinical feature is dissociation (APA, 2000), which is defined as "a psychological state in which the individual's level of consciousness is altered" and for those who have experienced it, it is described as "being separated from their body, 'zoned out,' floating above or apart from the body, detached" (Stickley & Nickeas, 2006, p.
This has led to confusion and ambiguity in the classification of dissociative disorders. These disorders are classified differently in DSM-Iv and International Classification of Diseases (ICD)-10.
On the other hand, when a person begins to experience dissociation chronically, he or she is more likely to be experiencing a dissociative disorder (Putnam, 1989).
The play's title refers to dissociative disorder, the medical term used to describe people separated from reality as a result of trauma or mental illness.
Noting that "one distinguishing feature of animal hoarding is that the intent to harm is absent even though great harm often occurs," the report says that hoarders may suffer what psychiatrists call dissociative disorder. As a substitute for absent human relationships, the lives of people with dissociative disorder can degenerate into anxious attachment or compulsive care-giving for far too many animals.
It was surprising that 51.2 percent (n = 43) of respondents to the dissociative disorder scale and 46.7 percent (n = 50) of respondents to the eating disorders scale also agreed with that statement.

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