What Is EMDR?
Okay… So when I first heard about EMDR, my reaction was something like: you want me to think about the worst thing that ever happened to me while following the dot on the screen?
Bullshit.
It sounds made up. It sounds like something you'd see parodied on a sketch show. And honestly, the fact that it works, and works well still kind of blows my mind.
So let's talk about it.
First, what even is EMDR?
EMDR stands for Eye Movement Desensitization and Reprocessing. It's a structured therapy developed in the late 1980s, and it's primarily used for trauma though research has since expanded it to anxiety, depression, panic, grief, phobias, and chronic pain.
The short version: it helps your brain finish processing experiences it got stuck on.
The longer version is where it gets fascinating!
Your brain is basically an operating system
Here's the analogy that actually makes this click.
Your memory, body, and nervous system work like a computer’s operating system. Under normal conditions, when something hard happens, your brain processes the experience — files it, learns from it, stores it correctly. The memory is still there. It might still be uncomfortable. But it's labeled past, and it runs quietly in the background without messing anything up.
Trauma is a corrupted file.
When something is overwhelming enough, the brain can't complete its normal processing sequence. Instead of getting filed under "hard things that happened," the memory gets stuck frozen in its original format, with all the raw emotion, physical sensation, and beliefs from that moment still fully attached. This is the core of Adaptive Information Processing (AIP) theory, which is the scientific framework EMDR is built on (Shapiro, 2001; de Jongh et al., Journal of Traumatic Stress, 2024).
Here's the problem with a corrupted file: it doesn't just sit there. It bogs down the whole system. Your OS keeps trying to run it. A smell, a tone of voice, a vaguely familiar situation — and suddenly the file is open and running and your nervous system is responding like the threat is happening right now, not years ago.
That's not you being dramatic. That's your OS doing exactly what it's supposed to do with a file it never properly stored.
EMDR is the software that repairs the file. Not deletes it — repairs it. The memory doesn't disappear. It just gets correctly formatted, properly dated, and stored somewhere it isn't constantly triggering a system-wide emergency response.
How it was discovered (and why the origin story is kinda wild)
In 1987, a psychologist named Francine Shapiro was walking through a park in California with some distressing thoughts running through her head — as one does. She noticed that as her eyes moved back and forth taking in the environment, the intensity of those thoughts seemed to drop. She deliberately tried to bring them back. They came back weaker.
She spent the next several weeks testing this on herself, then carefully with volunteers. Her first published randomized controlled trial came out in 1989.
It's a good story. Worth noting that some researchers have questioned parts of it — there's published academic debate about whether Shapiro had prior exposure to similar ideas through her earlier work in neurolinguistic programming (Rosen & Pankratz, Journal of Contemporary Psychotherapy, 2023). The origin may be a little more complicated than a eureka moment in a park.
What's not complicated: the decades of research that followed. More than 30 randomized controlled trials. Endorsement from the WHO, the APA, and the U.S. Department of Veterans Affairs. A 2024 meta-analysis finding EMDR just as effective as the other gold-standard trauma treatments (Wright et al., Psychological Medicine, 2024). Whatever the full story of how it got here, it's well-established now.
So why does moving your eyes do anything?
This is the part that people reasonably want explained, because on the surface it sounds like woo.
The leading scientific explanation is called working memory theory. Your working memory is your brain's active processing space — the RAM, not the hard drive. It has limited capacity. It can only juggle so much at once.
When you recall a traumatic memory while simultaneously doing something that requires attention like tracking a moving finger with your eyes those two tasks compete for the same limited mental workspace. The memory stays accessible, but its emotional intensity actually decreases while you're doing this. You're running a repair on the corrupted file while keeping it open just enough to work on it.
There's neurobiological support for this: taxing working memory suppresses activity in the amygdala your brain's handy dandy alarm system which reduces the emotional charge of the memory during reprocessing (de Jongh et al., Journal of Traumatic Stress, 2024). Meanwhile, the prefrontal cortex the part responsible for rational thinking and context becomes more active. Your brain gets to actually think about what happened instead of just reacting to it.
A normal example: imagine you had a horrible car accident five years ago. Since then, the sound of tires screeching sends your heart rate through the roof, even when you're perfectly safe. That's the corrupted file running. The facts of the accident are stored, but without proper date-stamping and context, your nervous system treats the trigger as a current threat. EMDR helps your brain complete the processing: "That was real. That happened. It was scary. And it's over. I'm okay now." The file gets properly stored, and your alarm system stops misfiring every time it hears tires.
Eye movements are the most common form of bilateral stimulation used, but not the only one some therapists use alternating taps on your knees or hands, or tones that switch between your left and right ears. The left-right alternating pattern seems to be what matters, not the specific method.
What actually happens in a session?
A few things EMDR is not: it's not hypnosis, it's not just guided relaxation, and you don't spend the whole session doing eye movements. That's a common misconception.
EMDR follows an eight-phase protocol, and honestly most of it is preparation and mapping making sure your system is stable enough to run the repair without crashing everything.
Phase 1 (History & Planning): Your therapist gets to know you and figures out which files need repair. You don't have to share everything about your overwhelming experiences, but they need enough to build a map.
Phase 2 (Preparation): Before anything gets reprocessed, your therapist essentially creates a restore point. They teach you stabilization and grounding skills tools to manage what comes up during and between sessions. Good EMDR therapists do not skip or rush this phase. If someone tries to jump straight into reprocessing in session one, that's worth raising.
Phase 3 (Assessment): You identify a specific target memory, the negative belief it created ("I'm not safe," "It was my fault," "I'm worthless"), the emotions and physical sensations tied to it, and what you'd actually prefer to believe about yourself. You rate how disturbing it feels on a 0–10 scale — this is called the SUD (Subjective Units of Disturbance). Therapists use this to track progress.
Phases 4–6 (Reprocessing): This is where the bilateral stimulation runs — in short sets, usually 20–60 seconds, with check-ins between each one. You hold the memory in mind while following your therapist's movements or listening to alternating tones. Your brain starts to move through the memory. New thoughts surface. Emotions shift. Sometimes other related memories come up. The distress typically decreases over multiple sets. The positive belief gets stronger. The file is being repaired.
Phase 7 (Closure): Every session ends with stabilization, whether or not reprocessing is complete. You don't leave with everything open and running.
Phase 8 (Reevaluation): Next session starts by checking in — how does the memory feel now? Did anything come up between sessions? Did the repair hold?
A typical course of treatment is somewhere between 6 and 12 sessions, though complex trauma often takes longer (APA, 2017).
What it's used for
EMDR was built for trauma, but research has broadened significantly. It's shown effectiveness for:
PTSD and complex/developmental trauma
Anxiety and panic disorders
Depression
Grief and loss
Phobias
Chronic pain (the mind-body research here is genuinely fascinating)
Performance anxiety
One thing worth knowing: EMDR isn't always the right starting point. If someone is dealing with significant dissociation, active crisis, or major instability in daily life, a good therapist will often spend considerable time in Phase 2 sometimes months before touching reprocessing. There's no point running a repair on a system that's already overloaded and crashing constantly. You stabilize first.
The part that doesn't get said enough
EMDR works by actually opening the corrupted file — not intellectualizing it, not avoiding it, not learning to live with the crashes. That means reprocessing sessions can bring up strong emotions, unexpected memories, and physical sensations. Some people feel exhausted after sessions. Some have vivid dreams. Some have a rough few days while things settle.
This is normal. It's the system doing the work.
But "this might feel harder before it feels better" is genuinely useful information to have going in. Knowing the difference between "this is hard because it's working" and "this is hard because something has gone wrong" matters. Your therapist should be orienting you to that distinction.
What reprocessing is not is re-traumatization. A skilled EMDR therapist manages pacing carefully they're keeping you in what's called a window of tolerance, processing without flooding. You're not being thrown at the worst memory and left there. The bilateral stimulation itself helps regulate that.
The bottom line
EMDR is not a magic trick. It's also not pseudoscience. It's one of the most well-researched therapies available for trauma, backed by over 30 randomized controlled trials and recommended by every major clinical body that weighs in on PTSD treatment.
If you've been in talk therapy for a while and feel like you keep telling the same story without it changing how it lives in your body that stuck, still-raw quality that doesn't seem to move no matter how much insight you have EMDR might be worth exploring. Insight is valuable. But sometimes the corrupted file needs more than understanding. It needs to actually be repaired and filed correctly.
Your OS already knows how to do this. EMDR just gives it the software to finish the job.
Curious if EMDR might be right for you? Reach out to schedule a consultation.
References:
de Jongh, A., et al. (2024). State of the science: EMDR therapy. Journal of Traumatic Stress, 37, 205–216.
Wright, et al. (2024). EMDR v. other psychological therapies for PTSD. Psychological Medicine.
Shapiro, F. (2001). EMDR: Basic principles, protocols, and procedures (2nd ed.). Guilford Press.
Rosen, G. M. & Pankratz, L. (2023). Revisiting the origins of EMDR. Journal of Contemporary Psychotherapy.
APA (2017). Clinical practice guideline for PTSD. American Psychological Association.
Landin-Romero, R., et al. (2018). How does EMDR therapy work? Frontiers in Psychology.
