EMDR and Dissociation: The Ultimate Clinician's Guide

Unrecognized dissociation is one of the most frequently cited reasons EMDR goes badly (Leeds, Madere & Coy, 2022). Standard EMDR assumes one integrated experiencer holding the memory, the body sensation, and dual attention at the same time. When the system that's holding the memory is dissociatively organised — separated from the body, segmented across parts, oscillating in and out of presence — the standard protocol can deepen the very thing it's trying to resolve.

This guide is the dissociation reference for clinicians using EMDR. It covers what dissociation actually is (and isn't), how to spot it across the four assessment lenses (history, screens, in-session behaviour, response to BLS), how to stabilize with grounding and parts-aware resourcing, and the specific protocol modifications — CIPOS, Loving Eyes, fractionated processing, parts-conferenced targets — that make EMDR safe with dissociative presentations.

Dissociation is a disruption in the normally integrated functions of consciousness, memory, identity, emotion, perception, body representation, motor control, and behaviour (DSM-5-TR). Functionally: pieces of experience that should be linked are not.

It exists on a continuum, not as a binary. Everyone dissociates mildly (highway hypnosis, getting lost in a book). Trauma-related dissociation sits further along — depersonalization, derealization, time loss, emotional numbing, identity confusion, parts that hold experience the rest of the system cannot access.

What dissociation is NOT: it is not 'being checked out', it is not the same as avoidance, it is not always dramatic, it is rarely what TV depicts, and it is not a personality flaw. Most dissociative clients look fine in waiting rooms. The presentations that derail EMDR are subtle: a flat affect during a high-SUD target, a 6-second pause before answering, a client who suddenly can't remember what was said two minutes ago.

Van der Hart, Nijenhuis and Steele's (2006) model is the most clinically useful framework for EMDR. Trauma can prevent the integration of two functional systems: the Apparently Normal Personality (ANP) — the part that handles daily life, work, parenting — and one or more Emotional Personalities (EPs) that hold the trauma-related affect, sensation, defence responses, and memories.

Primary structural dissociation: one ANP + one EP. Typical of single-incident PTSD. The EP holds the trauma; the ANP avoids it. Standard EMDR usually works.

Secondary structural dissociation: one ANP + multiple EPs. Typical of complex PTSD. Different EPs may hold fight, flight, freeze, submission, attachment cry, or specific developmental trauma. Standard EMDR often destabilizes without explicit parts-aware preparation.

Tertiary structural dissociation: multiple ANPs + multiple EPs. DID. The unmodified standard protocol is not appropriate; EMDR is used only in adapted form within a phase-oriented, parts-aware treatment frame, by clinicians with dissociation training (ISSTD, 2011).

Knowing which level you're working with determines whether you can run standard protocol, modified protocol, or whether you need to stay in stabilization for months before any reprocessing.

The three levels mapped visually. The number of ANPs and EPs is schematic — what matters clinically is whether the system is single-ANP (primary/secondary) or multi-ANP (tertiary), which sets the treatment frame.

EMDR works by holding a trauma memory and present-moment sensory input in conscious awareness at the same time — dual attention. Bilateral stimulation maintains the dual focus while the adaptive information processing system re-files the memory.

Dissociation breaks dual attention in three ways:

1. The client is not in the present. Bilateral stimulation without a felt sense of present safety is just retraumatization with eye movements.

2. The part that holds the memory is not the part doing the talking. The ANP reports SUD 2 on a memory the EP rates 10. Reprocessing 'completes' without the holder of the trauma ever being engaged. Symptoms return within days.

3. The window of tolerance is narrower than measured. Mild hypoarousal looks like calm; the clinician reads it as 'effective processing' and keeps going. Hours later the client is dissociated at home, suicidal, or amnestic for the session.

This is why EMDR training emphasises DES-II screening in Phase 1. It is the cheapest insurance against the most preventable EMDR adverse event.

EMDR's mechanism depends on holding THEN and NOW in awareness simultaneously. Dissociation collapses one circle — usually NOW — and the overlap where AIP can integrate disappears.

Siegel's window is the operational map for moment-to-moment EMDR work. Reprocessing requires arousal that stays inside the middle band. Above or below the window, BLS does not process — it deepens whichever direction the system is already escaping into.

Trained clinicians watch for dissociation through four overlapping lenses. No single lens is enough; combine them.

Lens 1 — History markers. Childhood abuse before age 6, prolonged medical trauma, neglect, attachment disruption, time loss episodes, gaps in autobiographical memory, hearing one's name when alone, fugue states, finding objects without remembering buying them, being told about behaviour one doesn't remember, 'losing time' in adulthood.

Lens 2 — Formal screening. DES-II for everyone, read item by item (a low total does not rule out dissociation); MID, SCID-D, DDIS as follow-up. See the assessment section below.

Lens 3 — In-session behavioural signs. See the next section.

Lens 4 — Response to BLS. Some clients dissociate only when bilateral stimulation begins. A clean history and a normal DES-II do not exclude dissociation that emerges only under activation.

These are the behavioural cues that should prompt you to slow down, ground, and reassess. Any single sign is data; clustering of signs is decision-making evidence.

If three or more of these appear in a single session, pause Phase 3–6 work, re-screen with DES-II / MID, and consider a phase-oriented adaptation before any further reprocessing.

Dissociation screening is the cheapest insurance in clinical practice. Use a tiered approach: a quick screen in Phase 1, follow-up only if positive.

DES-II (Dissociative Experiences Scale, Carlson & Putnam, 1993) — 28 items, self-report, 5–10 minutes. A total of 30+ (or DES-Taxon 20+) calls for further assessment — but a low total does not rule out a dissociative disorder, so review every item, especially the amnesia items (Leeds, Madere & Coy, 2022). Free, validated, easy to score. Should be administered to every EMDR client at intake. Sub-scales: amnesia, depersonalization/derealization, absorption. We publish a free color-coded DES-II PDF with subscales colour-banded, DES-T taxon items flagged, and a one-page EMDR decision guide built in.

MID (Multidimensional Inventory of Dissociation, Dell, 2006) — 218 items, self-report, 30–60 minutes. The standard comprehensive self-report follow-up when the DES-II or clinical picture points to dissociation. Measures 14 facets and 23 symptom scales, with validity scales; score with the official analysis workbook. Free for clinicians.

SCID-D-R (Structured Clinical Interview for DSM Dissociative Disorders, Steinberg, 1994) — semi-structured interview, 60–120 minutes. The reference-standard diagnostic interview for dissociative disorders (DID, OSDD). Requires training. Use when MID or DES-II suggest a dissociative disorder rather than dissociative symptoms.

DDIS (Dissociative Disorders Interview Schedule, Ross, 1989) — structured interview, similar use case to SCID-D.

SDQ-20 (Somatoform Dissociation Questionnaire, Nijenhuis, 1996) — 20 items, captures the body-level dissociation that DES-II misses. Useful when clients present with chronic pain, conversion symptoms, or somatic complaints alongside trauma history.

A-DES (Adolescent DES) for ages 11–17, CDC (Child Dissociative Checklist) for younger children — administered to caregivers.

After running DES-II in Phase 1, use these decision rules to determine whether to proceed to standard EMDR, modify, or stay in stabilization.

A dissociative client who cannot reliably ground themselves cannot tolerate reprocessing. Grounding is the most teachable, most rehearsable, most essential Phase 2 skill — and the easiest to underdose.

Grounding works on three channels: somatic (body), sensory (orienting to environment), and cognitive (reality-testing). Effective Phase 2 teaches at least one technique on each channel and confirms the client can self-administer between sessions.

The acid test: ask the client to drop into a mildly activating memory (SUD 3–4), then exit it back to baseline using their grounding tools. If they can do this repeatedly without your help, they're likely ready (a practice heuristic). If they need you to walk them out every time, you have more Phase 2 work to do.

A clinical toolbox — match the technique to the dissociative direction (hyper or hypo) and the channel that's most accessible to the client.

Teach a client at least one technique per channel — somatic, sensory, cognitive. Test under mild activation in Phase 2 before relying on it in Phase 4.

Knipe's Back-of-the-Head Scale gives you a moment-to-moment readout of presence during reprocessing — far more sensitive than asking 'are you with me?'. Teach in Phase 2; use in every Phase 4 session with dissociative clients.

If the client cannot get to the front of the line during Phase 2 practice, do not move to Phase 3. Continue grounding work, somatic resourcing, and consider sensorimotor or polyvagal-informed adjunct work before any reprocessing.

Visual reference for the Knipe scale you teach in Phase 2 and use every Phase 4 session. Front means fully present; anything past Mid means stop the next BLS set, orient, and rebuild presence before continuing.

If secondary structural dissociation is suspected, standard Phase 2 resourcing — Calm Place, Container, RDI — is necessary but not sufficient. The system holding the trauma is parts-organised, and the parts need to be met, acknowledged, and brought into the work explicitly.

This is not Dissociative Identity Disorder treatment unless SCID-D / MID confirms DID. Parts work for complex PTSD is a much smaller intervention: explicit recognition that the client experiences themselves as having different 'sides', different 'modes', or different developmental ages that hold different material, and using that language to build internal cooperation before reprocessing.

The core moves: name the parts the client already experiences (the inner critic, the scared child, the protector, the part that wants to leave therapy), acknowledge each part's function, build a 'conference table' or internal meeting space where parts can communicate, and explicitly ask all parts for consent before targeting any memory.

Use when a client describes themselves in fragmented terms ('a part of me wants to, another part doesn't') or when assessment indicates secondary structural dissociation. This is not 'doing IFS' — it's building shared language for EMDR Phase 2.

Once a client has language for their parts, the Phase 2 → Phase 3 transition includes a parts conference: explicit consent from every recognised part before initiating reprocessing.

The script is short. 'Before we work on [target memory], I want to check inside. Is there any part of you that doesn't want to do this today?' Wait. Listen. If any part objects — even subtly — the answer is not today. Find out what the objecting part is protecting against. Often it's a younger part who needs to know there's a safety plan, or a protector who needs to know it can stop the session.

This adds 3–8 minutes to Phase 2 work. It prevents the most common destabilization pattern with complex trauma: a willing ANP consents to reprocessing while a hidden EP — the actual holder of the memory — does not, and surfaces during BLS with no preparation and no agreed signal.

Several well-documented modifications make EMDR safe with dissociative presentations. None replace the standard protocol; they layer on top of it.

CIPOS (Constant Installation of Present Orientation and Safety, Knipe) — designed for clients who cannot tolerate sustained contact with trauma material. Used in Phase 4: the client briefly touches the memory (5–15 seconds), receives short BLS focused on present-moment orientation (not on the memory), then returns to baseline. Repeated in short cycles. Builds tolerance gradually without the dissociative breach that sustained Phase 4 would cause.

Loving Eyes (Knipe) — a resource installation that has the adult client visualise looking with compassion at the younger self in the trauma memory. Strengthens internal differentiation between adult-now and child-then, and gives the system an internal caregiver. Used as Phase 2 preparation and as an interweave when child parts surface during Phase 4.

Titrated (fractionated) processing (González & Mosquera, 2012; Knipe, 2019) — instead of running a target to SUD 0 in one session, run partial reductions across multiple sessions, with grounding and closure between each fraction. Especially useful for memories that hold multiple parts' material.

Dissociative Table (Fraser) — an imagery technique that gives the parts-system an internal meeting place. Useful as Phase 2 preparation for clients with secondary or tertiary structural dissociation.

Progressive Approach (González & Mosquera) — a comprehensive adaptation of the 8-phase protocol for DID and OSDD, with explicit attention to parts, attachment, and the therapeutic relationship as the primary stabilizing resource. Required reading if you see DID clients.

Ego-state–informed EMDR (Forgash & Copeley, 2008) — integrating ego-state therapy with EMDR for dissociative clients. Reduces overwhelm versus single-target sequencing.

What changes at each phase when dissociation is part of the picture. Use as a quick reference when supervising or designing a treatment plan.

Some signs in session mean the work is moving faster than the system can integrate. Stop reprocessing, close carefully, and consult before the next session:

New amnesia for sessions or session content the client previously recalled. A sign that material has been displaced rather than processed.

Emergence of a part the client and clinician had not previously met, especially mid-Phase-4. Indicates the parts-mapping was incomplete and consent for this target was partial.

Between-session self-harm, suicidal behaviour, or substance relapse that started after a reprocessing session. The work has moved past the system's containment capacity.

Switching speed increasing across sessions. A sign the system is overwhelmed, not integrating.

New somatic symptoms — chronic pain, conversion, sensory loss — appearing after EMDR sessions. Somatoform dissociation surfacing; treat as a signal to slow down.

The client cannot remember the last session, or remembers it as something different than what happened. Re-screen for amnesia and time loss; consider pausing all Phase 3–6 work.

None of these mean EMDR has failed. They mean the treatment frame needs to move back to stabilization, and a clinician working with this population without dissociation-specific consultation should not push through.

Phase 7 closure for dissociative clients is longer, more structured, and more rehearsed than standard closure. The session that ends well prevents the between-session destabilization that often arrives 24–72 hours later.

The checklist: presence confirmed (Back-of-the-Head at front), all known parts checked-in and stable, grounding tools rehearsed for use this week, Container used to set aside any unprocessed material, Calm Place re-installed if needed, between-session contact plan confirmed (when to call, when to use the safety plan, what to do if a flashback hits), next session confirmed, and a brief between-session log assigned so the client tracks symptoms in a contained way.

Write the closure plan into the chart with timestamps. If the client deteriorates between sessions, this documentation is the difference between a defensible adverse-event review and a malpractice exposure.

A defensible workflow when dissociation is on the differential:

Session 1–2: Standard intake + DES-II + PCL-5 + ACE. Note in-session signs. Begin somatic and orienting work alongside history.

Session 3–4: If DES-II ≥15 or any in-session signs, administer MID. Begin parts language and Back-of-the-Head scale teaching. Continue Phase 1 work.

Session 5–8: Phase 2 stabilization. Calm Place, Container, RDI, Loving Eyes if appropriate, grounding rehearsal under low-charge activation. Parts mapping if secondary structural dissociation suspected.

Session 8–20+: Continued Phase 2 with progressive activation testing. Move to Phase 3 only when client can self-regulate from SUD 4 → SUD 1 without clinician assistance, demonstrates parts cooperation, and Back-of-the-Head scale stays at the front under mild activation.

Phase 3+ onward: All standard reprocessing layered with parts conferences, CIPOS where indicated, fractionated processing, frequent presence checks, extended closure. Plan that each target may take 2–4 sessions, not 1.

For most complex-trauma clients with secondary structural dissociation, treatment usually runs considerably longer than for single-incident PTSD — often a year or more. The 8-session EMDR studies are about single-incident PTSD in stable adults; they do not describe what dissociation-aware EMDR looks like.