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DISSOCIATIVE IDENTITY DISORDERS
Disorder formerly known as Multiple Personality Disorder.
A person may adopt up to 100 identities (average ≈ 15).
Identities (“alters”) can be:
Fully developed with unique behaviors, voices, and gestures.
Or partially independent with only some distinct traits.
Core feature: fragmentation of identity + amnesia (DSM-5).
Case Example: Jonah
Alters identified:
Sammy → rational, calm.
King Young → focused on sexual activity.
Usoffa Abdulla → violent protector.
Triggers: severe stress & trauma:
Saw mother stab father (Sammy emerged).
Mother cross-dressed him (King Young appeared).
Attacked by youths at age 9–10 (Usoffa Abdulla emerged).
Jonah had violent blackouts (e.g., attacks, chases, threats) with no memory afterward.
Characteristics of DID
Host identity: Seeks treatment, attempts to keep identity fragments together, but usually not the original personality.
Alters: May serve specific roles (e.g., sexual, protective, cross-gender).
Switching: Rapid, often instantaneous shift between alters.
May involve physical changes: posture, facial expressions, handedness (37% of cases).
Memory gaps: Host and alters may have different awareness levels of one another.
Can DID Be Faked? Concerns of malingering
DID patients are highly suggestible. Alters may be unintentionally created by therapist suggestion (especially under hypnosis).
Example: Kenneth Bianchi (Hillside Strangler) claimed DID during trial. Produced a fake alter (“Steve”) when asked. Expert Martin Orne proved he was simulating.
Can DID Be Faked? Experiments
College students could fake alters when suggested it was plausible.
DID patients perform like simulators in memory tasks (implicit memory unaffected across alters).
Can DID be faked? Sociocognitive model
DID may arise through therapist suggestion + reinforcement (Spanos, 1996).
Evidence Supporting Authenticity of DID
Physiological differences among alters:
Different electrodermal activity, EEG patterns, brain imaging (hippocampal/temporal activity).
Optical changes (eye movements, vision differences) that are hard to fake.
Clinical observations:
DID patients often reluctant to show symptoms, unlike malingerers who exaggerate
Prevalence & Controversy
No clear consensus: Only ⅓ of psychiatrists fully endorse DID as valid DSM diagnosis.
Public fascination fueled by media (e.g., Three Faces of Eve, Sybil).
Some cases are questioned for accuracy, but physiological studies suggest DID can involve genuine neurobiological changes.
Key takeaways
DID = severe fragmentation of identity with amnesia.
Alters may serve functional roles (protective, sexual, aggressive, cross-gender).
Switching is sudden and can involve physical/neurological changes.
DID is controversial: debate over authenticity vs. suggestion/faking.
Evidence suggests at least some cases are genuine, supported by neurophysiological differences.
STATISTICS
Average 15 alter personalities
Ratio of females to males (DID) = 9:1
Data is based on accumulated case studies rather than survey research
Onset
almost always in childhood (as young as 4 years old)
But it is usually approximately 7 years after the appearance of symptoms before the disorder is identified
Course
Chronic in the absence of treatment
The form DID takes does not seem to vary substantially over the person’s lifespan, although some evidence indicates the frequency of switching decreases with age
Different personalities may emerge in response to new life situations
Incidence
There are no comprehensive epidemiological studies on the prevalence of the disorder in the general population, although investigators now believe it is more common than previously estimated.
For example, semistructured interviews of large numbers of severely disturbed inpatients found prevalence rates of DID of between 3% and 6% in North America
Approximately 2% in Holland.
In the best survey to date in a nonclinical (community) setting, a prevalence of 1.5% was found during the previous year
Comorbidity Research
A large percentage of DID patients include anxiety, substance abuse, depression, and personality disorders.
More than 100 patients have more than seven additional diagnoses
Comorbidity: DID frequently overlaps with other disorders, especially borderline personality disorder (BPD).
Overlap with BPD: Similarities include self-harm, suicidality, and emotional instability.
Misdiagnosis:
DID is often confused with psychotic disorders due to auditory hallucinations
Dissociative Identity Disorder voice vs Psychotic voice
DID VOICES | PSYCHOSIS VOICES |
internal | external |
The patient is aware that they are hallucinations. | Often not recognized as hallucinations |
The characteristics of DID voices
Nature of voices: Often command-like, urging harmful or unwanted actions.
Cultural manifestation: In some cultures, DID is seen as demonic possession.
Global prevalence: Evidence shows DID exists in 21+ countries
Lack of research: Few systematic studies on DID across cultures
CAUSES
Almost every patient presenting with this disorder reports to their mental health professional being horribly, often unspeakably, abused as a child.
Children experiencing severe trauma, such as abuse, may be unable to escape physically or seek help.
As a coping mechanism, they often retreat into fantasy and create alternate identities to endure the pain.
This process can lead to the development of Dissociative Identity Disorder (DID).
Research shows very high rates of childhood trauma among DID patients, with most reporting physical or sexual abuse, including extreme cases of torture or incest.
Investigators have confirmed abuse histories in some cases, though there are also instances where memories may be confabulated or inaccurate.
Not all the trauma is caused by abuse:
E.g., a young girl in a war zone who saw her parents blown to bits in a minefield
In a heart-wrenching response, she tried to piece the bodies back together, bit by bit
Root cause of DID
DID is rooted in a natural tendency to escape or “dissociate” from the unremitting negative affect associated with severe abuse
A lack of social support during or after the abuse also seems implicated.
A study of 428 adolescent twins demonstrated that a surprisingly major portion of the cause of dissociative experience could be attributed to a chaotic, nonsupportive family environment. Individual experience and personality factors also contributed to dissociative experiences
Behavior and Emotions that make up DID
Seems related to otherwise normal tendencies present in all of us to some extent
Quite common for otherwise normal individuals to escape in some way from emotional or physical pain
Example: survivors of life-threatening events reported unreality, emotional numbing, and out-of-body experiences
Dissociative Amnesia and Fugue States
Clear reactions to severe life stress
Response to current severe stress, and not just childhood trauma
Triggers: legal problems, family stress, job stress
Diathesis-Stress Model states that
Not everyone under extreme stress develops DID or severe dissociation
(Diathesis-Stress Model) Pathological dissociation occurs only if:
Stress (Trauma, severe life event)
Vulnerability/Diathesis (predisposition)
Dissociative Identity Disorder (DID) and Posttraumatic Stress Disorder (PTSD)
Share similarities in that both are strongly linked to severe trauma.
However, not everyone exposed to trauma develops PTSD.
The risk depends on individual biological and psychological vulnerabilities, particularly a predisposition to anxiety.
While moderate trauma leads to PTSD mainly in vulnerable individuals, severe trauma increases the likelihood for almost anyone, though some remain resilient.
This highlights the interaction between trauma severity and individual vulnerability in the development of PTSD, including its dissociative subtype.
DID is an extreme subtype of PTSD
But with a much greater emphasis on the process of dissociation than on symptoms of anxiety, although both are present in each disorder
Developmental Vulnerability
Critical Period: Approximately 9 years of age
Trauma before age 9 → higher risk of DID.
Trauma after age 9 → more likely to have PTSD.
Shows the role of the developmental stage in psychopathology
Limitations in research
Evidence mainly from retrospective case studies & correlational data
Few prospective studies (tracking trauma survivors over time).
Psychological and biological risk factors are not well-defined.
Some individual differences may influence who develops DID vs. PTSD.
SUGGESTIBILITY
the degree to which a person is inclined to accept and act on the suggestions of others, even without critical analysis or independent judgment
Some people are more suggestible than others
Some are relatively immune to suggestibility, and the majority fall in the midrange.
Having an imaginary childhood playmate
It is one sign of the ability to lead a rich fantasy life, which can be helpful and adaptive.
But it also seems to correlate with being suggestible or easily hypnotized
~50% of DID patients recall them in childhood.
Unclear if these formed before or after trauma.
HYPNOTIC TRANCE
similar to dissociation
People in a trance tend to be focused on one aspect of their world, and they become vulnerable to suggestions by the hypnotist
SELF-HYPNOSIS
which individuals can dissociate from most of the world around them and “suggest” to themselves that, for example, they won’t feel pain in one of their hands.
Autohypnotic Model
Suggestible people can use dissociation as a defense against trauma.
DID arises as an extreme form of dissociation
Role of Suggestibility to DID
High suggestibility → more likely DID.
Low suggestibility → more likely PTSD.
Trauma Impact
Severe trauma → identity splits into multiple dissociated selves
Children’s blurred boundary between fantasy & reality allows DID to form.
After age 9, DID is unlikely; trauma is more likely to form into PTSD
BIOLOGICAL CONTRIBUTION
Like PTSD, Dissociative Identity Disorder (DID) likely involves a biological vulnerability, though it is difficult to identify.
Twin studies suggest that DID is shaped entirely by environmental factors rather than heredity.
However, heritable traits such as stress reactivity and tension may indirectly increase risk.
Neurobiological evidence
DID patients may have reduced hippocampal and amygdala volumes, similar to findings in PTSD.
Neurological Disorders and Dissociation
Seizure disorders are linked to dissociative symptoms
Temporal lobe epilepsy is especially associated with dissociation
Key distinction:
seizure-related dissociation = adulthood onset, not trauma-related
DID without seizures = trauma-related, often begins in childhood.
Head injury can cause amnesia/dissociation, but:
Generalized, irreversible.
Clear cause (head trauma).
Easier to diagnose
Sleep deprivation
Produces hallucinations and dissociative symptoms
DID patients report worsening symptoms when tired
Described as feeling like jet lag
REAL MEMORIES AND FALSE
A major controversy exists: some researchers argue that many recovered memories may actually be false, implanted by suggestive or careless therapists.
This debate highlights the unreliability of memory
People may forget real events or recall events that never occurred.
Believing false memories → risk of harming innocent people (e.g., false accusations).
Dismissing true memories → risk of invalidating real trauma survivors.
A therapist's suggestion can create false but convincing memories
Risk of False Memories
False accusations against loved ones.
Family breakdown.
Unjust prison sentences.
Lawsuits against therapists → millions in damages
Evidence for false memory creation
Established psychological processes can generate false but vivid memories
ONGOING CONTROVERSY
PRO SIDE | CONS SIDE |
Trauma may cause selective dissociative amnesia → impaired recall of abuse | Doubt that people can encode trauma yet fail to recall it |
Both false memories and genuine repressed trauma exist and need caution in therapy and legal settings
No all-or-none answer
Elizabeth Loftus and colleagues
have demonstrated that false or illusory memories can be created through suggestion.
In one classic experiment, individuals were convinced they had been lost in the mall as children, even recalling additional invented details over time.
Despite later being told the event never happened, participants insisted the memory was real.
Other research shows that implanted false memories (getting sick from egg salad) can influence behavior, such as developing aversions to certain foods (participants avoided egg salad months later)
These findings provide strong experimental evidence that memory is malleable and vulnerable to distortion, which has major implications for the recovered memory debate.
CHILDREN’S MEMORY ACCURACY
Children, particularly very young ones, are prone to memory errors.
Emotional content (e.g., trauma, abuse) further reduces accuracy
The testimony of very young children may be unreliable.
Important caution for legal settings (child abuse cases, witness reliability
Research study on CHILDREN’S MEMORY ACCURACY
Ceci’s Child Studies
58% of preschool children described fictitious events as if real.
25% reported them as real most of the time.
Narratives were detailed, coherent, and elaborated beyond the original suggestion.
27% insisted the false memories were real even after being told they were not.
“Alien Abduction Story”
Participants were divided into 3 groups:
Recovered memories of alien abduction.
Repressed beliefs (believe abduction occurred, but no memories).
Controls (no such beliefs)
Findings:
Groups with recovered/repressed memories showed more false recall and recognition in lab tasks.
They also scored higher on suggestibility and depression than controls
Memory is malleable and vulnerable to distortion. Certain personality traits (e.g., absorption, vivid imagination, openness to unusual ideas) make some people more likely to form illusory or false memories
THERAPIST IMPORTANCE
Therapists must remain sensitive to possible trauma in patients with dissociative disorders or PTSD, even when such trauma is not immediately remembered. Research shows mixed findings:
Williams (1994)
Studied 129 women with documented childhood sexual abuse.
38% did not recall the abuse even after probing, especially if the victim was young or knew the abuser.
Goodman et al (2003)
Interviewed 175 people with documented abuse histories.
81% remembered and reported their abuse.
Higher recall was linked to older age at abuse end and emotional support after disclosure.
McNally & Geraerts (2009)
Some individuals may simply forget abuse (ordinary forgetting, not repression).
Memories can return naturally when encountering reminders outside of therapy
Reports of childhood sexual abuse memories fall into four possible categories
Always remembered the abuse.
False memories (created inadvertently).
Recovered memories in therapy (of “repressed” abuse).
Forgotten and later remembered abuse (ordinary forgetting, later triggered).
FALSE MEMORIES
Can be created through repeated suggestions by authority figures (therapist)
Therapist Responsibility
Must understand memory science.
Avoid leading/suggestive questioning.
Problem with untrained therapists
They can unintentionally implant elaborate false memories.
Example Cases:
Satanic ritual abuse accusations in daycare centers.
Now seen as false memories induced by aggressive interviewing.
Resulted in wrongful life sentences for elderly caregivers
TREATMENT for dissociative amnesia or fugue state
Most individuals with dissociative amnesia or a fugue state recover on their own and eventually regain their lost memories.
Cause: Closely tied to present life stress (not just past trauma, so preventing recurrence involves resolving the stress and strengthening coping skills.
When therapy is needed, the focus is on treatment is
Recall forgotten events.
Integrate experiences into consciousness.
Use collateral reports (family/friends) to aid reconstruction.
This helps the individual confront the events and make them part of conscious awareness.
TREATMENT FOR DISSOCIATIVE IDENTITY DISORDER (DID)
Treatment for Dissociative Identity Disorder (DID) is far more challenging than for dissociative amnesia or fugue. Since DID involves a fractured sense of identity, reintegration can seem nearly impossible, but some therapeutic success has been documented.
Evidence of success: Long-term psychotherapy has led to integration in some cases
Prognosis: Generally guarded/poor
Course: chronic and rarely improves without treatment
Studies:
5/20 patients achieved full integration
12/54 patients (22.2%) achieved integration after 2 years
Limitations: Lack of controlled studies; improvements may be due to other factors, not necessarily therapy
Current treatment strategies for DID
Current treatment strategies for DID draw from both clinical experience and PTSD treatment methods. The main goals are:
Identify & neutralize triggers → cues that provoke traumatic memories or dissociation.
Confront & relive trauma → patient gradually re-experiences the trauma in therapy to transform it from a re-living into a memory.
Regain control → therapy focuses on giving patients mastery over traumatic memories rather than being overwhelmed by them.
Techniques for treating DID
Visualization & reliving trauma → guided by the therapist slowly and carefully.
Hypnosis → sometimes used to access unconscious memories and bring alters into awareness. This may be effective because dissociation itself resembles hypnosis, though there’s no evidence hypnosis is essential for treatment.
Risk of dissociation during therapy
When traumatic memories resurface, they may trigger further dissociation, so therapists must stay alert and manage this carefully.
Trust is essential
While trust is always important in therapy, it is absolutely crucial for DID treatment, given the vulnerability and fragmentation of identity.