A Forgotten Frenchman, Read Again
To understand structural dissociation you must first learn a 19th-century name: Pierre Janet (1859–1947). He systematized trauma and dissociation before Freud, but the 20th century's psychoanalytic 'repression' model so dominated that Janet was buried for nearly a century.
Janet's insight was simple. Overwhelming events fail to integrate into memory and split off as separately living fragments — what he called désagrégation. As trauma neurobiology matured in the 2000s, Onno van der Hart, Ellert Nijenhuis, and Kathy Steele rebuilt Janet's frame for modern clinics in The Haunted Self: Structural Dissociation and the Treatment of Chronic Traumatization (W.W. Norton, 2006).
A preface: this is not the 'multiple personalities look cool' SNS genre. Diagnosis belongs to trained clinicians; self-diagnosis is unhelpful.
ANP and EP — Why Personality Splits
The two key terms:
- ANP (Apparently Normal Part): the 'me' that goes to work, cooks, speaks in meetings. Maintains daily function by avoiding access to trauma memory. Avoidance, dissociation, normalization are its defenses.
- EP (Emotional Part): the part 'frozen' in the trauma moment. Holds the sensations, affects, and defense responses (terror, rage, paralysis) of the original event. Mostly subliminal until triggers (a smell, sound, relational pattern) intrude.
van der Hart et al. trace the split's evolutionary roots to Stephen Porges's polyvagal theory and the animal defense cascade: flight → fight → freeze → submit → cry for help → total submission. After trauma ends, one defense often 'crystallizes' as the core of an EP. Some EPs flee forever, some fight forever, some stay numb forever.
Primary, Secondary, Tertiary — Depth of Split
| Level | ANPs | EPs | Typical diagnosis | Treatment phase emphasis |
|---|---|---|---|---|
| Primary | 1 | 1 | Single-incident PTSD | Brief stabilization, larger memory-work share |
| Secondary | 1 | many | CPTSD, some BPD, some eating/somatoform | Substantial stabilization, iterative phases |
| Tertiary | many | many | Dissociative Identity Disorder (DID) | Long stabilization, alliance with every part |
Primary is classic PTSD after a single event (a crash, an assault, a disaster). Secondary often arises from chronic childhood trauma: one ANP coexists with many EPs (fear-EP, anger-EP, shame-EP, submission-EP). Much of CPTSD and a meaningful portion of BPD live here. Tertiary holds multiple ANPs (e.g., 'work self' and 'parent self' mutually amnestic) alongside multiple EPs — the deepest split, the DSM-5 diagnosis of DID.
This is not a severity label but a treatment branch point. Applying EMDR or exposure — fine for primary PTSD — to a tertiary patient without stabilization risks retraumatization.
Janet's Three Phases — Order is Safety
van der Hart et al. modernize Janet's 19th-century phase-oriented treatment into:
- Stabilization & symptom reduction: keep the patient within Siegel's 'window of tolerance' via affect regulation, grounding, relational safety, daily structure; manage self-harm/suicide risk; build communication channels with EPs.
- Treatment of traumatic memories: turn EP-held fragments into integrable narrative the ANP can own as personal past — EMDR, written exposure, somatic approaches (Levine, Ogden).
- Integration and rehabilitation: softened boundaries between parts; rebuilding work, relationships, life purpose.
van der Hart et al.'s 2005 Journal of Traumatic Stress paper catalogues what happens when the order is broken. Skipping phase 1 with secondary/tertiary patients floods the ANP with intrusion, spiking self-harm, dissociative crises, and dropout. Brand's 2009 review of DID outcomes and the ISSTD 2011 Adult DID Treatment Guidelines both anchor on phase-oriented care.
How It Differs from IFS
Richard Schwartz's Internal Family Systems (IFS) is increasingly popular. Both speak of 'parts' but assume different things.
- IFS: everyone is natively composed of parts ('protectors', 'exiles', 'managers') — a universal structure independent of trauma. Therapy is the Self in dialogue with parts.
- Structural dissociation (van der Hart): division is not universal but a failure of integration caused by trauma, a direct mechanism of psychopathology. The goal is not coexistence but ultimate integration.
IFS can be useful and gentle, especially in stabilization for primary/secondary cases, but ISSTD guidelines remain the standard for DID. Not all 'parts models' are the same.
Who It Applies To — and Who It Does Not
Structural dissociation appears in:
- Complex PTSD (CPTSD)
- DID and Other Specified Dissociative Disorder (OSDD)
- Some borderline personality disorder, especially with trauma history
- Some eating, somatoform, and conversion disorders
It is not:
- Daily 'zoning out' or highway-driving automaticity
- Mood swings or having different sides with different people
- 'I get angry suddenly' impulsivity
Self-diagnosing 'I'm like ANP/EP' on social media is meaningless. If you have a trauma history with repeated intrusion into daily function, see a trauma-trained clinician rather than self-labeling.
Korean Clinical Context
- Korean Society for Traumatic Stress Studies (KSTSS, founded 2002): clinician training and guidelines.
- Korean Clinical Psychology Association dissociation section: scale standardization and case sharing.
- DES-K (Korean Dissociative Experiences Scale): standardized by Park Joo-eon and colleagues in 2017; a self-report screener, not a standalone diagnostic tool.
- Korean DID case reports: since Lee Soo-jung 2009, multiple cases have appeared in peer-reviewed journals, correcting the old assumption that 'DID does not occur in Korea.'
- Public resources: community mental health centers, regional trauma centers, the National Center for Mental Health.
Conclusion: Not Pathology But Adaptation
van der Hart and colleagues repeat one line throughout The Haunted Self — the split was not a defect but an adaptation that enabled survival in overwhelming circumstances. Trouble begins when that adaptation outlives the threat.
The order of treatment is therefore not 'face the truth fast' but build safety first, then re-weave memory into integrable form, and only then let personality gather again. Holding that order is the conclusion Janet and ISSTD reached a century apart.
