How Does EMDR Work? Eye Movements, Tapping, and How Trauma Gets Unstuck
- Deanna Doherty
- Jun 10
- 9 min read
Updated: 6 days ago
It can be years later. A certain smell, a tone of voice, a particular kind of quiet — and suddenly your chest is tight, your heart is loud, and some part of you is right back in it.
If that's familiar, know this first: nothing is wrong with you. That's what an unprocessed memory does. It doesn't sit quietly in the past — it stays live in your nervous system, ready to flood the present.
EMDR therapy was built for exactly this. And nearly everyone who looks into it asks the same question: how does EMDR work? The eye movements, the tapping — it can sound a little strange at first.
So here's a plain-English walk through what's actually happening in EMDR — and what it feels like from the inside.
The short version: EMDR (Eye Movement Desensitization and Reprocessing) helps your brain finish processing memories that got stuck. While you briefly hold a difficult memory in mind, your therapist guides you through bilateral stimulation — side-to-side eye movements, tapping, or sounds. The memory doesn't disappear, but its emotional charge eases. It starts to feel like something that happened, rather than something that's still happening.
First, What Is EMDR?
EMDR stands for Eye Movement Desensitization and Reprocessing — a structured, evidence-based therapy developed by psychologist Francine Shapiro in the late 1980s. It was designed for trauma and PTSD, and it's now used for anxiety, grief, phobias, and painful memories of every kind.
Here's what makes it different from traditional talk therapy: you don't have to retell your story in detail, and you don't have to make sense of it out loud. EMDR works with the way memories are stored in your brain and body — not just the way you think about them.
Why Trauma Gets Stuck (and Why You Can't Just Move On)
Think of your experiences like food.
Most of what happens to you, your mind digests on its own. It breaks the day down, absorbs what's useful, and lets the rest go — a lot of that filing happens overnight, during REM sleep.
But some experiences are too much, too fast. The system gets overwhelmed and can't break them down. The experience gets stuck — undigested — in your nervous system, still carrying the original images, sensations, and beliefs it arrived with.
That's why a trigger doesn't feel like remembering. It feels like reliving. The memory was never filed away as "past," so your body responds as if it's happening right now.
And stuck memories don't tend to stay neutral. Left alone, they often behave like an untreated cavity: they don't repair themselves, they deepen. More of life starts to brush against the sore spot — more places to avoid, more reactions that seem to come out of nowhere.
None of this is weakness. It's a healthy nervous system doing its best with something it was never meant to absorb alone. Therapists call this the Adaptive Information Processing model: your brain naturally wants to digest and integrate what happens to you, and trauma interrupts that process midway.
EMDR's job is to restart it.
How Does EMDR Work? Bilateral Stimulation, Explained
At its core, EMDR works like this: you briefly hold a difficult memory in mind while your therapist guides you through bilateral stimulation (BLS) — rhythmic, side-to-side input such as guided eye movements or gentle tapping. That pairing appears to unlock the brain's stalled processing, so the memory can finally be digested and re-stored without the same raw charge.
Bilateral stimulation comes in a few forms:
Eye movements. Your eyes track a steady left-right motion — your therapist's hand, or a dot moving across your screen.
Tapping. You alternate gentle taps on your shoulders or knees, guided by your therapist. You may hear this called EMDR tapping, or the butterfly hug.
Sounds. Soft tones alternate between your left and right ear through headphones.
Why would moving your eyes change how a memory feels? Researchers point to a few overlapping explanations:
It mirrors REM sleep. The side-to-side rhythm resembles what your eyes naturally do during the stage of sleep when your brain processes the day. EMDR seems to engage that same machinery — while you're awake and supported.
It gently taxes working memory. Holding a memory while tracking movement means the memory can't load at full intensity. It softens, blurs at the edges, loses some of its grip.
It keeps one foot in the present. The rhythm anchors you in the here and now while you touch the past — what therapists call dual awareness. You're not reliving the memory. You're observing it from steady ground.
If you'd like the deeper science — the amygdala, the hippocampus, and what shifts in between — we've written more about what EMDR does to the brain and nervous system.
The 8 Phases of EMDR
EMDR isn't a single technique — it's a structured therapy that moves through eight phases (you'll sometimes see them called the stages of EMDR). The quiet early phases matter just as much as the famous eye-movement part.
History and treatment planning. You and your therapist map what you're carrying and where you want to go. Nothing is processed yet.
Preparation. You build grounding skills and inner resources — a calm place to return to, ways to settle your body. You don't go near the hardest material until your footing is steady.
Assessment. Together you choose a target memory and name the belief that got attached to it ("I'm not safe," "It was my fault") — plus the belief you'd rather carry instead.
Desensitization. The bilateral stimulation begins. Short sets, brief check-ins, no need to narrate. Distress is rated as you go, and eases set by set.
Installation. The truer belief — "It's over," "I did the best I could" — is strengthened until it actually feels true, not just sounds true.
Body scan. You notice anywhere the memory still lives physically — a clenched jaw, a heavy chest — because trauma keeps its last foothold in the body.
Closure. Every session ends with you grounded and steady, whether or not the memory finished processing.
Reevaluation. The next session opens by checking what held, and what wants attention next.
Don't let the number eight intimidate you. Phases one and two can take a few sessions on their own, and phases three through eight repeat for each memory you work through. It's a rhythm, not a checklist.
What an EMDR Therapy Session Actually Feels Like
You're awake, aware, and in control the entire time. EMDR isn't hypnosis, and nothing is done to you — you're an active participant who can pause or stop at any point.
A typical reprocessing session has a rhythm: a short set of bilateral stimulation (often around thirty seconds), a pause, and your therapist asking, "What are you noticing?" You answer in a word or a sentence — an image, a body sensation, an emotion, or "nothing." Then another set.
You don't have to narrate your trauma. You don't have to perform insight. The processing happens underneath the conversation.
Most people describe it like waves: feeling rises, crests, and eases — each set letting it ebb a little further. Sessions can be tiring, the way deep work is tiring. It's worth planning something gentle afterward.
Does EMDR Actually Work?
A fair question — especially for a therapy that sounds this unusual.
The short answer: yes, the evidence is strong. EMDR is recognized as an effective treatment for PTSD by the American Psychological Association, the World Health Organization, and the U.S. Department of Veterans Affairs, backed by decades of clinical trials. For single-incident trauma, research suggests EMDR can bring relief in fewer sessions than many traditional approaches.
One honest footnote: researchers still debate exactly why the eye movements help — some argue the active ingredient is the safe, structured way EMDR lets you revisit a memory. What's not really in debate is whether it helps. If you like reading research directly, EMDRIA keeps a thorough library.
And one honest expectation: EMDR isn't instant, and it isn't magic. It's structured, sometimes demanding work — and for many people, it's the work that finally gets things moving.
What Can EMDR Help With?
EMDR was developed for PTSD, but what counts as trauma is wider than one diagnosis. EMDR can support you with:
Single-incident trauma — an accident, an assault, a frightening medical event, a sudden loss
Childhood and complex trauma — long stretches of experience that shaped how safe the world feels
Anxiety and panic — EMDR for anxiety targets the memories that taught your body its alarm settings
Grief that stays tangled — when loss knots together with shock, guilt, or things left unsaid, EMDR can work alongside grief therapy
Phobias and painful memories that don't meet any diagnostic criteria at all
You don't need a diagnosis to deserve relief. If a memory still runs your nervous system, that's reason enough.
At Shifting Tides, EMDR often works hand in hand with Internal Family Systems (IFS) therapy — IFS helps you get to know the protective parts of you that formed around the wound, while EMDR helps the wound itself finally process.
Does EMDR Work Online?
Yes — and this question is close to home, because Shifting Tides is a fully virtual practice.
EMDR adapts naturally to telehealth. Eye movements follow a dot moving across your screen, or your therapist's hand on camera. Tapping, you do yourself — guided in real time. Research on virtual EMDR has found outcomes comparable to in-person treatment.
And there's something many clients only discover once they begin: processing trauma from your own couch, wrapped in your own blanket, with your own tea nearby — that familiarity can give the work a kind of safety an office never could.
You can read more about our EMDR therapy, offered virtually across New York, Connecticut, and Florida.
How Long Does EMDR Take?
It depends on what you're carrying — and anyone who promises a fixed number isn't listening yet.
As a general rhythm: a single, more recent event often shifts noticeably within six to twelve sessions. Layered or childhood trauma takes longer — months, sometimes more — with a generous share of that time spent in preparation, building the steadiness that makes deeper work possible.
Healing this way isn't linear. It ebbs and flows, loosens and settles. What matters isn't speed — it's that things are finally moving.
EMDR Side Effects: What's Normal After a Session
EMDR keeps working between sessions — your system keeps digesting. So in the days after reprocessing, it's common and completely normal to notice:
Vivid dreams (often a sign processing is continuing overnight)
Tiredness, like after any deep effort
Emotions sitting closer to the surface
New memories or connections drifting up
Uncomfortable isn't the same as unsafe. This is exactly what the preparation phase equips you for, and exactly what your therapist wants to hear about next session — it's information, not a setback. With a trained EMDR therapist pacing the work, EMDR is considered a safe, well-tolerated therapy.
Frequently Asked Questions About How EMDR Works
Is EMDR like hypnosis?
No. You're fully awake, aware, and in control throughout. EMDR relies on dual awareness — one foot in the memory, one foot planted firmly in the present. You can speak, pause, or stop at any time.
Do I have to talk about my trauma in detail?
No — and for many people this is EMDR's kindest feature. Your therapist needs only a brief snapshot of the memory and what it left behind. The reprocessing happens inside you, not in the retelling.
Does EMDR erase memories?
No. EMDR changes how a memory is stored, not whether it exists. You'll still know what happened — it just stops happening to you. Most people describe the memory afterward as more distant, like it finally found its place in the past.
Why do some people call EMDR controversial?
The debate is about mechanism, not results. Researchers still discuss how much the eye movements themselves contribute. But the outcomes — across decades of studies — are consistent enough that the APA, WHO, and VA all recommend EMDR for trauma.
What if I don't remember everything clearly?
That's okay — and very common, since trauma often fragments memory. EMDR doesn't require a complete story. It works with whatever is present: an image, a body sensation, an emotion, a belief.
Can EMDR make things worse?
Feelings can intensify for a while between sessions — stirred sediment before water clears. That's why preparation comes before processing, and why pacing matters so much. Tell your therapist what surfaces; the pace adjusts to what your nervous system can use.
Is EMDR only for PTSD?
Not at all. EMDR supports anxiety, grief, phobias, and painful memories that never earned a diagnosis. If an experience still has a grip on your present, EMDR may help loosen it.
When You're Ready to Move Through It
Trauma doesn't digest on a schedule, and there's no deadline for being ready.
But if something in this article felt like recognition — the tight chest, the memory that won't file itself away — that's worth listening to. We offer virtual EMDR therapy to adults across New York, Connecticut, and Florida, starting slow and moving at the pace your nervous system can actually use.
About the Author
Deanna DiCostanzo, LCSW, is the founder of Shifting Tides Therapy and an EMDR-trained trauma therapist. She provides virtual therapy to clients throughout New York, Connecticut, and Florida, with a focus on trauma, grief, and anxiety.
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