Eye movements are one phase out of eight. Here's what each of the 8 phases of EMDR therapy actually does, and why the ones nobody talks about decide whether it holds.
Ask someone what EMDR is and they will describe eye movements, or a therapist tapping on their knees. That is one phase out of eight, and skipping the other seven is a big part of why some reprocessing never holds.
EMDR (Eye Movement Desensitization and Reprocessing) follows a fixed eight-phase structure developed by Francine Shapiro and documented by organizations like the EMDR International Association. In order, the phases are: 1) History-Taking, 2) Preparation, 3) Assessment, 4) Desensitization, 5) Installation, 6) Body Scan, 7) Closure, and 8) Reevaluation.
Each phase depends on the one before it. You cannot run Phase 4 without a target locked in from Phase 3. You cannot end a session responsibly without Phase 7. The phases are not interchangeable tools a clinician picks from, they are a sequence with dependencies, closer to a surgical checklist than a buffet.
The bilateral stimulation that shows up in every EMDR explainer, and in our own breakdown of how bilateral stimulation works in EMDR therapy, belongs to Phase 4 specifically. It is the engine of desensitization, not a description of the whole method. The other seven phases are what make that engine safe to run and durable afterward.
| Phase | Name | Primary job |
|---|---|---|
| 1 | History-Taking | Map targets, screen readiness |
| 2 | Preparation | Build stabilization skills |
| 3 | Assessment | Set image, beliefs, baselines |
| 4 | Desensitization | Bilateral stimulation reprocessing |
| 5 | Installation | Strengthen positive belief |
| 6 | Body Scan | Check for residual tension |
| 7 | Closure | Return to stability |
| 8 | Reevaluation | Recheck target next session |
Before any reprocessing happens, the clinician takes a full history: what memories are driving current symptoms, what the client's coping resources look like, and whether EMDR is an appropriate fit right now. This phase also builds a treatment plan, a sequenced list of target memories to work through, rather than jumping straight to the most painful one.
Phase 2 is where the client develops a reliable way to self-soothe before touching distressing material. A common exercise is the "calm place" or "safe place" visualization, paired with a grounding skill the client can call on mid-session if distress spikes. Resources like tactile grounding techniques are exactly this kind of tool: concrete, physical, and rehearsed before they are ever needed under pressure.
Therapists often introduce lower-intensity bilateral stimulation here too, not to reprocess trauma yet, but to let the client get comfortable with the sensation. One recognized method for reducing the charge on a memory before full desensitization begins is the EMDR flash technique, which is deliberately brief and low-distress by design. None of this is optional scaffolding. A client who cannot self-regulate in Phase 2 is not ready for Phase 4.
Phase 3 is where the target gets defined with precision: a single representative image from the memory, the negative belief attached to it ("I am powerless"), and the positive belief the client wants to feel instead ("I am safe now"). Vague targets produce vague reprocessing, so clinicians spend real time narrowing this down.
Two numbers get recorded before anything moves: the Subjective Units of Disturbance Scale (SUDS), rating distress from 0 to 10, and the Validity of Cognition (VOC) scale, rating how true the positive belief feels, from 1 to 7. These are not formalities, they are the baseline every later phase gets measured against.
| Measure | Scale | What it tracks |
|---|---|---|
| SUDS | 0 to 10 | Distress tied to the memory |
| VOC | 1 to 7 | How true the positive belief feels |
If the image, beliefs, and baselines are not locked in, Phase 4 has nothing stable to reprocess against. Assessment is the bridge: brief on paper, but it is the phase that turns "something bad happened" into a measurable target.
A "set" is a short burst of bilateral stimulation, typically 20 to 30 seconds, during which the client holds the target image and belief in mind. After each set, the therapist checks in briefly, then moves to the next set based on what surfaced. Our explainer on BLS in EMDR covers the mechanics of why alternating left-right stimulation is believed to support reprocessing in the first place.
Pace is not fixed. Therapists adjust speed based on how the client is responding set to set, slowing down when material feels overwhelming and sometimes speeding up when processing appears to be moving freely. We break this down in how fast should EMDR tapping be, which is a question that comes up constantly from clients trying to understand what "correct" pacing even means.
Phase 4 does not require eye movements specifically. Tactile tapping, auditory tones, and other delivery methods all accomplish the same bilateral alternation. Our comparison of bilateral stimulation therapy's four delivery methods walks through eye movement, tactile, auditory, and combined approaches side by side, since the delivery mode is a clinical choice, not a defining feature of the phase.
TheraJoy is built around tactile bilateral stimulation using Nintendo Joy-Cons, alternating vibration between left and right that mirrors the alternating pattern a therapist uses for tapping in Phase 4. It also includes a visual light bar and auditory tones with stereo panning for clients who prefer or need a non-tactile option. Our piece on how therapists use tappers in EMDR sessions shows how handheld tactile tools map onto this exact clinical workflow.
TheraJoy is designed to sit inside the eight-phase structure, not outside it: practicing grounding between sessions, or giving a therapist a consistent tactile tool during Phase 4. TheraJoy Pro extends this to remote sessions, where the therapist's device controls the client's device live over a session code, so pacing decisions made in Phase 4 happen in real time even when therapist and client are not in the same room. The client-side app is free, so there is no cost barrier for the person doing the reprocessing. Note that TheraJoy's tactile stimulation currently works with Nintendo Joy-Cons specifically, not DualSense, Xbox controllers, or Apple Watch.
Once distress on the target memory has dropped, Phase 5 shifts focus to the positive belief identified back in Phase 3. More sets of bilateral stimulation are run, this time holding the positive cognition in mind, until the VOC rating climbs as high as it can genuinely go. The goal is not just lower distress, it is a belief that feels true, not just repeated.
The client is asked to hold the memory and positive belief together while mentally scanning for any physical tension: tight shoulders, a knotted stomach, shallow breathing. If anything shows up, it becomes its own target for more bilateral stimulation.
A SUDS of zero on the original memory does not guarantee the body has caught up. Trauma research consistently points to somatic residue as separate from cognitive distress, which is exactly why Phase 6 exists as its own distinct step rather than being folded into Phase 4.
No session ends mid-reprocessing if it can be helped. Phase 7 brings the client back to a stable, regulated state before they leave the room, using the same calming techniques introduced in Phase 2. If a target is not fully processed when time runs out, the therapist uses closure to contain it rather than leave the client activated.
Clients are typically given a brief log to track what comes up between sessions, plus a reminder of their grounding tools. The same tactile grounding techniques introduced during preparation get reused here as the containment toolkit for the days between sessions.
The next session opens with Phase 8: revisiting the target memory to check whether the SUDS and VOC scores held, dropped further, or shifted. This is also when new material that surfaced between sessions gets folded into the treatment plan from Phase 1.
Phases 1, 3, and 8 all require clinical judgment that is difficult to replicate without training: screening for dissociation risk, selecting a precise target, and reading whether a client's distress is genuinely resolving or just suppressed. These are not phases a self-guided app can safely own.
Our breakdown of self-directed EMDR is direct about where the line sits: tools can support Phase 2 grounding and provide the tactile, visual, or auditory stimulation mechanics used in Phase 4, but they cannot replace the clinical judgment that runs Phases 1, 3, 6, 7, and 8. That is the gap a bilateral stimulation app is built to sit inside, not around.
Remote EMDR has become standard practice at many practices, and the eight phases translate reasonably well over video as long as the therapist retains control of pacing in Phase 4. This is the specific gap TheraJoy Pro is built for: live, therapist-controlled pacing on the client's device during a remote session, rather than the client guessing at speed alone.
Trauma-focused CBT also follows a structured arc, typically moving through psychoeducation, skills building, and gradual exposure. Our comparison of EMDR vs CBT for trauma lays out where the two overlap and where they diverge, since both the American Psychological Association and the VA National Center for PTSD list both approaches as recognized trauma treatments.
EMDR's eight phases front-load more stabilization work before any exposure-adjacent processing begins, which some clients and clinicians prefer for memories that feel too activating to approach through narrative exposure first. Neither approach is universally superior, fit depends on the client, the memory, and the clinician's training.
| Dimension | EMDR (8 phases) | Trauma-focused CBT |
|---|---|---|
| Structure | Fixed 8-phase sequence | Modular skills-based arc |
| Verbal narrative required | Minimal | More central |
| Core mechanism | Bilateral stimulation | Exposure and cognitive restructuring |
| Homework between sessions | Grounding practice | Structured exercises, logs |
History-Taking, Preparation, Assessment, Desensitization, Installation, Body Scan, Closure, and Reevaluation, in that fixed order.
It varies by client and memory. Phases 1 and 2 can span multiple sessions for someone with a complex history, while Phases 3 through 7 often happen within a single session once a client is stabilized. Phase 8 happens briefly at the start of the next session.
Phase 4, Desensitization, is where the core sets of bilateral stimulation happen. Lower-intensity bilateral stimulation sometimes shows up earlier, during Phase 2 practice or techniques like the EMDR flash technique, but Phase 4 is where the primary reprocessing work occurs.
Not responsibly. A trained clinician might move through a phase quickly if a client is already stable or a target is already clear, but skipping stabilization or closure outright increases the risk of a client leaving a session more activated than when they arrived.
There is no fixed number. A single clear memory with a stable client might move through all eight phases in a handful of sessions. A longer history with multiple targets and complex trauma can take considerably longer, since Phase 1 and 2 work has to be solid before Phase 4 begins.
Usually not on the first pass. History-taking and preparation often take their own session or sessions, and reevaluation by definition happens at the start of the next session after a target has been processed.
Remote EMDR delivered by a trained therapist over video has become common practice. Tools like TheraJoy Pro are built specifically for this, letting a therapist control pacing on the client's device live during a session using a session code, which keeps Phase 4 pacing decisions in the clinician's hands even at a distance.
The eye movements and the tapping are the part everyone remembers, but they are one phase in an eight-phase sequence, and the phases most people skip past in conversation, history-taking, preparation, closure, and reevaluation, are what actually determine whether the work from Phase 4 holds once the client leaves the room.
TheraJoy delivers tactile, visual, and auditory bilateral stimulation via iPhone. Remote sessions included in Pro. Free 7-day trial.
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