AP Psychology 5.6: Dissociative and Trauma-Related Disorders

Dissociative disorders

A group of mental disorders involving significant disruption or fragmentation in the normal integration of consciousness, memory, identity, emotion, perception, body representation, motor control, or behavior.

What role can dissociation play in dissociative disorders?

Dissociation is typically understood as an involuntary, unconscious defense response that separates aspects of experience to help a person cope with traumatic or overwhelming stress.

Dissociative identity disorder (DID)

A disorder characterized by the presence of at least two distinct personality states or identity states, together with clinically significant disruptions in memory, consciousness, or behavior.

What type of memory disruption is associated with dissociative identity disorder?

DID involves memory gaps that are more extensive than ordinary forgetfulness and may involve important events, everyday activities, or periods associated with another identity state.

Why is the etiology of dissociative identity disorder controversial?

The trauma model attributes DID primarily to severe, ongoing childhood trauma, whereas sociogenic models emphasize learned behavior, cultural beliefs, media exposure, fantasy, or unintended effects of therapy. Evidence and interpretation remain disputed.

What evidence has challenged the claim that memory is always divided between identity states in DID?

Some studies have found that although people with DID report amnesia between identity states, their performance on objective memory tests may remain intact.

Dissociative amnesia

A dissociative disorder involving an inability to recall important autobiographical information, often concerning traumatic or stressful events, without an adequate explanation from ordinary forgetting.

What kinds of memories are most typically affected in dissociative amnesia?

The gaps usually concern autobiographical or personal information, particularly memories related to traumatic or stressful experiences.

How is dissociative amnesia distinguished from organic amnesia?

Dissociative amnesia is thought to arise from psychological stress or trauma without evident structural brain damage, whereas organic amnesia is associated with neurological disease, injury, or other biological causes.

Dissociative fugue

A state involving dissociative amnesia accompanied by unexpected travel or wandering and confusion about identity or autobiographical information. In current classification, it is generally treated as a specifier of dissociative amnesia rather than a separate primary disorder.

Depersonalization

A feeling of detachment from oneself, such as experiencing one's thoughts, body, or actions as though observing them from outside.

Derealization

A feeling of detachment from the external world, which may seem unreal, dreamlike, foggy, surreal, or visually distorted.

Depersonalization-derealization disorder (DPDR)

A dissociative disorder involving persistent or recurrent depersonalization, derealization, or both. The person generally recognizes that these unusual experiences are subjective rather than literal changes in reality.

What distinguishes depersonalization from derealization?

Depersonalization concerns detachment from the self, body, thoughts, or actions, whereas derealization concerns detachment from the surrounding environment.

What is the most common broad explanation for the development of dissociative disorders?

They are often understood as coping responses to psychological trauma, including chronic childhood physical, sexual, or emotional abuse, severe loss, war, or frightening and unpredictable environments.

Is childhood abuse required for dissociative amnesia or DPDR to develop?

No. Childhood abuse or neglect is common in some affected individuals, but dissociative amnesia and DPDR can also follow other severe stressors, such as the sudden death of a loved one.

How can depersonalization-derealization disorder differ from other dissociative disorders in its triggers?

Although it can be associated with childhood trauma, DPDR may also follow less severe stress, psychoactive-substance use, sudden loss, or no clearly identifiable trigger.

What brain-activity pattern has been associated with dissociative symptoms?

Research has reported greater activity in prefrontal regions and increased inhibition of limbic regions, on average, in people with dissociative disorders compared with healthy controls.

How might increased prefrontal inhibition of the limbic system contribute to dissociation?

Greater top-down inhibition of limbic structures such as the amygdala may reduce intense emotional arousal during overwhelming experiences, contributing to symptoms such as depersonalization and derealization.

What structural brain differences have been reported in some people with dissociative disorders?

Studies have reported reduced cortical and subcortical volumes in regions including the hippocampus and amygdala. These findings are group-level associations and do not by themselves diagnose an individual.

What alternative explanation links dissociation to sleep and cognition?

One model proposes that an unstable sleep-wake cycle may contribute to memory errors, attentional-control problems, cognitive failures, and difficulty distinguishing fantasy from reality, producing dissociative-like experiences.

How do cultural perspectives affect the interpretation of dissociation?

Dissociation may be interpreted as pathological in some settings but as a normal or culturally meaningful capacity in others, such as trance or possession-related practices. Cross-cultural differences complicate prevalence estimates and diagnosis.

Why is it important to distinguish cultural trance experiences from dissociative disorders?

A trance or possession experience may be culturally sanctioned and non-impairing, whereas a dissociative disorder generally involves clinically significant distress, dysfunction, or loss of control. Context is essential for diagnosis.

What question does the defense-versus-pathology debate about dissociation address?

It asks whether pathological dissociation is qualitatively different from ordinary dissociative experiences or instead lies on a continuum with normal absorption, stress responses, PTSD, and acute stress disorder.

How did DSM-5 position dissociative disorders relative to trauma- and stressor-related disorders?

The DSM-5 kept dissociative disorders in their own chapter while emphasizing their close relationship to trauma- and stressor-related disorders, and it added a dissociative subtype of PTSD.

What evidence-based caution should be applied to brain-imaging findings in dissociative disorders?

Group differences in brain activity or volume can support biological investigation but do not establish a single cause, prove a diagnosis, or show that every person with a dissociative disorder has the same neural pattern.