EMDR, Explained: What It Is and What Actually Happens in a Session
There's a particular kind of stuck that talk therapy alone doesn't always reach.
You understand your history. You can explain, with real insight, why you react the way you do. You've done the work of connecting the dots. And then something small happens, a tone of voice or an unanswered text, and your body responds like it's twenty years ago. The understanding is right there and it doesn't help.
That gap between knowing and feeling is what EMDR is built for.
What the letters mean, and why it doesn't matter much
EMDR stands for Eye Movement Desensitization and Reprocessing. It's a clunky name from 1987 that describes one version of the method rather than the method itself.
The origin story is that psychologist Francine Shapiro noticed, while walking through a park during a stressful period, that distressing thoughts seemed to lose some of their charge as her eyes moved back and forth. She started testing it, and a model grew out of it.
What's interesting about that story is how much of it got left behind. She was also walking. She was outdoors. When she began experimenting, another person was present. The model that developed narrowed in on the eye movements and set the rest aside.
In practice, the left-right stimulation doesn't require eye movements at all. Many people do better with alternating taps, handheld pulsers, rocking side to side, or tones that alternate between the ears. The rhythmic bilateral attention is the common element.
What it's actually for
The standard picture of EMDR is a combat veteran or a survivor of a single catastrophic event. It does work well for that. It's also dramatically underused for everything else.
Most of the people I work with wouldn't describe their history as traumatic. They describe a childhood where things were mostly fine. A parent who was critical rather than cruel. A relationship that eroded slowly instead of exploding. A workplace where they learned to make themselves smaller.
Those experiences leave the same kind of residue. An experience that doesn't get fully processed doesn't need to be dramatic. It needs to have arrived when you didn't have the support or the capacity to metabolize it, which for a child is most of the time.
The signature is a reaction that's out of proportion to the present moment and doesn't respond to reasoning.
What the theory says
Ordinarily your brain does something remarkable with difficult experience. It processes it, learns from it, and files it away as history. The experience becomes part of what you know rather than something that keeps happening.
Sometimes that doesn't complete. The pieces of an experience come apart instead of integrating. The image, the emotion, the body sensation, and the belief that formed out of it end up stored separately and stay live. When something in the present resembles the original, the whole cluster activates at once, and there's no sense that it's over. Your sense of time collapses. The past reads as now.
EMDR's underlying premise, which Shapiro called adaptive information processing, is that the capacity to complete that work is already in you. It isn't something a therapist installs. Given enough support and safety, the system resumes doing what it was always trying to do. My job is to create the conditions and stay out of the way, not to interpret your experience for you or tell you what it means.
I'll be honest that the mechanism behind the bilateral stimulation is still debated. One line of thinking is that dividing your attention limits how much of the memory can flood the mind at once, which makes it possible to approach without being consumed. Another points to activation of lower brain structures involved in movement and regulation. It may also resemble something REM sleep does.
The mechanism question is unsettled. The efficacy question is much less so. The World Health Organization lists EMDR among its recommended psychological treatments for PTSD in adults, and the 2023 VA/DoD clinical practice guideline recommends it alongside cognitive processing therapy and prolonged exposure, with psychotherapy favored over medication. We're clearer that it works than we are about why.
If you want the broader picture of how therapy changes the brain's predictions about the world, I've written about that separately in why therapy works.
What happens in an EMDR session
This is the part people are most anxious about, so here's the shape of it.
We don't start with processing. The early sessions are history, understanding your context, and building capacity. You develop reliable ways to steady yourself and return to a settled baseline. This isn't preamble. The reasoning behind phase-based trauma work, which goes back to Judith Herman, is that you need a felt sense of safety before you turn toward the hard material, or there's nothing to connect it to. If you can't reliably come back down, we're not ready to go up. Rushing this is the most common way EMDR goes badly.
We pick a target. Usually a specific moment rather than a whole era. A single image that carries the charge.
We set up the frame. What belief about yourself came out of that moment, in the present tense. Something like I'm not safe or I'm too much or it was my fault. Then what you'd rather believe instead. Then what emotion is present, and where you feel it in your body. I ask for a number, zero to ten, on how disturbing it feels right now.
Then we process. You hold the target in mind, we start the bilateral stimulation for a short set, and then you tell me what came up. Whatever came up becomes the next thing you hold. We repeat. The chain moves on its own, often somewhere unexpected.
We strengthen what shifted. New insights and new felt states get deliberately reinforced rather than left to fade.
We close. Every session ends with returning to steadiness and releasing whatever's still holding, whether or not the target is finished.
Two things worth saying plainly. You stay awake and in control the entire time. It isn't hypnosis, and you can stop at any point. And you don't have to describe the memory in detail out loud. Some people process almost silently.
Somatic EMDR vs. standard EMDR: why I practice the somatic version
I'm trained through the Institute for Creative Mindfulness, which is EMDRIA-approved, and I completed The Embody Lab's Somatic EMDR Therapy Certificate with Dr. Arielle Schwartz and Dr. Scott Lyons.
The distinction matters, and here's why.
Standard EMDR is largely a top-down process. It works with images, beliefs, and cognitions, and it's often very effective at creating distance from a memory. You go from being inside the experience to watching it from outside. That shift alone can be a relief so sudden it feels suspect.
But distance isn't the same as completion. It's common to lose the emotional charge on a memory and still find the pattern living in your body. The held breath. The braced shoulders. The posture you organized around something years ago and never came out of. Those patterns keep shaping how you move through the world even after the memory has stopped stinging.
Somatic work goes after that layer. It means tracking sensation throughout, not just noting it at setup. It means working in small increments rather than flooding, so that your system learns it can approach hard material and stay okay. It means attending to what's incomplete in the body, the impulses that never got to finish, and giving them somewhere to go.
There's a second reason, which is about me rather than the technique. Somatic training isn't only a set of interventions to apply to you. It's what makes attuned presence possible. I track my own body in the room as a way of sensing yours, and that's a large part of how I know when to slow down, when there's more room, and when something just shifted that you haven't named yet.
For people who are highly verbal and highly insightful, this is often the missing piece. You can talk about your history with real fluency. The body has a different account, and nobody's asked it.
Choice is the point
The core injury in trauma is loss of choice. Something happened and you had no say in it.
So the work has to be built the other way around. You choose when to turn toward the material and how far in to go. You choose how much to say. You choose whether we stay with something or come back out. If a session needs to stop, it stops.
That isn't me being accommodating. Restoring your sense of agency is a substantial part of what makes the process work at all.
When it isn't the right starting point
If you're in active crisis, if you're in an ongoing unsafe situation, or if you tend to dissociate significantly under stress, the preparation phase needs to be longer and sometimes a different approach comes first. Stability precedes processing. A therapist who wants to start reprocessing in the first or second session is moving too fast.
What it's like afterward
Sessions can be tiring. Processing sometimes continues for a day or two, showing up as vivid dreams or unexpected emotion. That's normal and it settles.
When a target resolves, the shift usually isn't dramatic. It's more that you go looking for the charge and it isn't where you left it. The memory is still there. It reads as history instead of as a live wire.
That's the goal. Not forgetting, and not reframing something painful into something acceptable. Just having it finally be over, in your body as well as in your understanding.