AP Syllabus focus:
‘Dissociative disorders disrupt consciousness, memory, identity, emotion, perception, or behavior, while trauma- and stressor-related disorders such as PTSD develop after trauma or stress.’
Trauma-related and dissociative disorders show how extreme stress can alter memory, awareness, and emotional responding. AP Psychology emphasises recognising core symptom patterns, differentiating categories, and understanding how trauma can shape later functioning.
Big Picture: Two Related Disorder Groups
Dissociative disorders (disruptions in integration)
Dissociative disorders involve a breakdown in the normal integration of consciousness, memory, identity, emotion, perception, or behaviour.
Dissociation: A disruption in the normal integration of consciousness, memory, identity, emotion, perception, and/or behaviour, often experienced as disconnection from self or surroundings.
Dissociation can be transient (e.g., “spacing out”) but becomes clinically significant when it is persistent, distressing, and impairs functioning.
Trauma- and stressor-related disorders (responses to adverse events)
These disorders develop following exposure to a traumatic event or significant stressor. The stressor is central to diagnosis (the symptoms are tied to what happened).
Post-traumatic stress disorder (PTSD): A trauma- and stressor-related disorder marked by intrusive memories, avoidance, negative changes in mood/cognition, and heightened arousal after exposure to trauma.
PTSD is the key example named in the syllabus and is the most commonly assessed trauma-related disorder in introductory courses.
Dissociative Disorders: Core Types Students Should Recognise
Dissociative amnesia (sometimes with “fugue”)
Primary feature: inability to recall important autobiographical information, typically of a traumatic or stressful nature, beyond ordinary forgetting
Memory gaps are often “patchy,” involving specific events or periods
Dissociative fugue (a specifier in some diagnostic systems): sudden travel or wandering with confusion about identity and/or partial identity change
Depersonalisation/derealisation disorder
Side-by-side depiction of derealisation vs. depersonalisation. The image visually distinguishes whether the feeling of unreality is centered on the environment (derealisation) or on the self (depersonalisation), which helps prevent mixing up these two dissociative experiences. Source
Depersonalisation: feeling detached from one’s self (e.g., feeling unreal, like an outside observer)
Derealisation: feeling detached from the world (e.g., surroundings feel dreamlike or foggy)
Reality testing is typically intact (the person knows the experience is a feeling, not literal reality)
Dissociative identity disorder (DID)
Involves two or more distinct identity states (often described as “alters”) and recurrent memory gaps
Controversial and frequently misunderstood; AP-level focus is on recognising defining features (identity disruption + amnesia-like gaps), not sensationalised portrayals
Often discussed in relation to severe, chronic early trauma, though causal claims should be made cautiously
Trauma- and Stressor-Related Disorders: PTSD Symptom Pattern
The PTSD cluster framework (high-yield)
Symptoms typically fall into these clusters:
Intrusion: distressing memories, nightmares, flashbacks, intense distress at reminders
Avoidance: efforts to avoid trauma-related thoughts, feelings, people, places, or situations
Negative alterations in cognition/mood: persistent negative beliefs, guilt/shame, emotional numbing, diminished interest, detachment
Arousal/reactivity: hypervigilance, exaggerated startle, irritability, sleep problems, concentration difficulties
PTSD differs from ordinary stress reactions because symptoms persist, cause impairment, and are tied to trauma exposure rather than general worry.
Dissociation can occur with PTSD
Some people show dissociative symptoms (e.g., depersonalisation/derealisation) alongside PTSD, reflecting a “shut down” or detached response to trauma reminders.
Distinguishing the Categories (Common AP Comparisons)
What is disrupted?
Dissociative disorders: integration of memory/identity/awareness is the core disruption
Trauma- and stressor-related disorders: fear-based learning and trauma-linked responding are central
Role of a stressor
PTSD requires trauma exposure as a defining feature
Dissociative disorders may be trauma-associated, but diagnosis is based on dissociative symptoms themselves
Common confusion
PTSD flashbacks are vivid re-experiencing; dissociative amnesia is inability to recall (memory loss), not vivid reliving
Key Terms to Use Precisely
Trauma: an event involving actual/threatened death, serious injury, or sexual violence (not every stressful event qualifies)
Impairment: symptoms interfere with school, work, relationships, or daily functioning
Comorbidity: dissociation, depression, and anxiety symptoms commonly co-occur with trauma reactions without being the same disorder
FAQ
Not exactly. “Repression” is a psychodynamic concept describing unconscious blocking. Dissociative amnesia is a clinical description of impaired autobiographical recall, diagnosed based on observable impairment and distress rather than inferred unconscious mechanisms.
High arousal can bias attention toward threat cues and away from context (time/order). Later recall may be sensory and cue-driven (sounds, smells) rather than a coherent narrative, contributing to patchy or disorganised remembering.
In depersonalisation, reality testing is usually intact: the person recognises “this feels unreal” rather than believing a bizarre explanation. In psychosis, beliefs may be fixed and not corrected by evidence.
Some frameworks describe complex PTSD after prolonged, repeated trauma (e.g., captivity), with added problems in emotion regulation, self-concept, and relationships. Debate centres on whether it is distinct from PTSD plus comorbidities.
No. Cultural beliefs shape how distress is experienced and expressed (e.g., spirit possession interpretations). Clinicians aim to separate culturally normative experiences from clinically impairing dissociation.
Practice Questions
State one defining feature of a dissociative disorder and one defining feature of PTSD. (2 marks)
1 mark: Dissociative disorder feature (e.g., disruption in memory/identity/consciousness; amnesia for autobiographical information; depersonalisation/derealisation).
1 mark: PTSD feature (e.g., intrusion/flashbacks; avoidance; negative mood/cognition changes; hyperarousal following trauma).
A teenager survived a serious car crash. Months later, they have nightmares, avoid riding in cars, feel constantly “on edge,” and sometimes feel detached from their body as if watching themselves from outside. Explain how these symptoms relate to PTSD and dissociation. (6 marks)
Up to 4 marks: PTSD explained with accurate links to clusters (nightmares = intrusion; avoidance of cars = avoidance; “on edge” = arousal/reactivity; symptoms occurring after trauma).
Up to 2 marks: Dissociation explained and linked (detached from body = depersonalisation; may co-occur with PTSD as a dissociative response).
