EMDR Therapy Explained: How Eye Movement Desensitization Works

EMDR therapy asks you to hold a difficult memory in mind while following a repeated left-to-right movement with your eyes. It sounds strange. It is also one of the better studied trauma treatments available.

The full name is eye movement desensitization and reprocessing. It was developed by psychologist Francine Shapiro in the late 1980s.

Below we cover what the treatment is doing, the eight phases of a full course, who it suits, and where the honest limits are.

What Is EMDR Therapy?

The working idea is that some memories never finished processing. They stay stored with the original sights, sounds, and body sensations attached, so they behave like a live event rather than a past one.

Cleveland Clinic explains it as a way of helping the brain reprocess those memories so they settle into ordinary storage.

The EMDR Institute describes the same mechanism. The memory does not disappear. What changes is the charge it carries when you think about it.

What Bilateral Stimulation Actually Is

The eye movement is the famous part of EMDR therapy. It is not the only option.

• Following the therapist’s fingers or a light bar with your eyes
• Alternating taps on your knees or hands
• Alternating tones through headphones
• Handheld buzzers that pulse left and right

All of these are called bilateral stimulation. The purpose is to occupy part of your attention while the rest holds the memory, so you stay connected to the present while you work.

Why that helps is still debated. Researchers have put forward several explanations and the field has not settled on one.

That is worth knowing before anyone promises you a mechanism. The treatment has good evidence. The story about why is less firm than it sounds.

The Eight Phases of EMDR Therapy

A full course follows a set structure. Most of it is not what people picture.

1. History taking, where you and your therapist map what to work on.
2. Preparation, including grounding skills and a safe place exercise you can use if a session gets heavy.
3. Assessment, where you pick the target memory, the image, and the belief attached to it.
4. Desensitisation, the part with the bilateral stimulation.
5. Installation, where a more useful belief is strengthened in its place.
6. Body scan, checking for tension the memory still holds physically.
7. Closure, bringing you back to a settled state before you leave.
8. Re-evaluation, checking at the next session what actually held.

Phases one and two often take several sessions. Skipping them is the most common way this treatment goes badly.

Ask any therapist how long they spend on preparation. A short answer is a warning sign.

You do not have to narrate the trauma in detail. For many people that is the reason they choose this over other approaches.

Who EMDR Therapy Helps

The evidence base is strongest in PTSD. The American Psychological Association includes it in its PTSD guideline as a conditionally recommended treatment.

EMDRIA, the professional body for the modality, also points to its use with a wider range of conditions. That wider evidence is thinner, and anyone telling you it treats everything is going beyond what the research supports.

It suits some people better than others. If talking through the detail is the part you dread, this is often a good fit.

If you have never felt safe in your own body, the order of treatment may need to change. Our PTSD treatment page covers where it fits in a full plan.

What to Expect From EMDR Therapy

Sessions run longer than standard therapy, often around ninety minutes. Distress rises during processing and usually settles before the session ends.

You stay awake and in control the whole time. You can stop at any point, and saying so is part of the method rather than a failure of it.

Some people feel drained afterwards. Others notice vivid dreams for a night or two. That usually passes within a few days.

When it is not the right starting point

• Active substance use, where processing is unsafe until things are steadier
• Severe dissociation, which usually needs stabilization work first
• Current crisis or an unsafe living situation
• No grounding skills in place yet, which is what phase two is for

Where dissociation is prominent, body-based work such as sensorimotor psychotherapy often comes first. Some people also find art therapy for trauma a gentler way in.

Getting Help at Yellowbrick

EMDR therapy is one route through trauma treatment, not the only one. Which route fits depends on what your nervous system can currently hold.

Our Trauma Recovery Program works with emerging adults aged 16-30’s at Yellowbrick’s Evanston, Illinois practice, and our post on healing after trauma covers what recovery looks like over time. Call our admissions team at 847-869-1500 to start an assessment.

Frequently Asked Questions

What exactly happens in an EMDR session?

You bring a target memory to mind along with the image and belief attached to it. While holding it, you follow a repeated left-to-right cue with your eyes, or receive alternating taps or tones. You pause often to report what came up, then continue. The session ends with grounding before you leave.

Who should not do EMDR?

It is usually delayed for anyone in active crisis, in an unsafe living situation, or using substances heavily, since processing needs stability to be safe. Severe dissociation generally calls for stabilization work first. None of these rule it out permanently; they change the order of treatment.

What are the pros and cons of EMDR therapy?

On the plus side, you do not have to describe the trauma in detail, and it is included in the American Psychological Association guideline for PTSD. On the other side, sessions can be draining, distress rises before it falls, and the evidence outside PTSD is thinner than marketing often suggests.

How does EMDR work?

The working theory is that trauma memories are stored without being fully processed, so they still carry their original sensations. Holding the memory while attention is split by a bilateral cue appears to let the brain file it properly. The exact mechanism is still debated among researchers.