Explain EMDR Therapy: Does it Really Work?

If you've heard of EMDR, you might have a few questions — and maybe some skepticism. Eye movements? Processing trauma by following a therapist's fingers? It can sound, on the surface, more like something from a self-help book than a clinical treatment.

But EMDR is one of the most thoroughly researched therapies in the mental health field. It's endorsed by the World Health Organization, the American Psychological Association, and Health Canada. And for many people living with trauma and PTSD, it has been genuinely life-changing.

So what actually is it — and how does it work?

What Does EMDR Stand For?

EMDR stands for Eye Movement Desensitization and Reprocessing. It was developed in the late 1980s by psychologist Dr. Francine Shapiro, who noticed that certain eye movements seemed to reduce the emotional intensity of distressing thoughts. What started as an observation became, over decades of research, a structured therapeutic approach with a strong evidence base.

How the Brain Stores Trauma

To understand why EMDR works, it helps to understand what trauma does to the brain.

When something frightening or overwhelming happens, the brain's normal memory processing system can get disrupted. Instead of being filed away as a past event — the way most memories are — traumatic memories can get stored in a raw, unprocessed state. They stay lodged in the nervous system, still carrying the original images, physical sensations, emotions, and beliefs from the moment they happened.

This is why trauma survivors often don't just remember what happened — they relive it. A smell, a sound, a particular tone of voice can trigger the nervous system into responding as if the danger is happening right now, even decades later. The brain hasn't fully registered that it's over.

EMDR works by helping the brain do what it couldn't do at the time: fully process the memory, so it can be stored as something that happened in the past — not something that's still happening now.

What Actually Happens in an EMDR Session?

EMDR therapy is structured in eight phases, and it doesn't begin with diving into trauma on the first session. A skilled EMDR therapist starts by building a thorough understanding of your history, identifying which memories are at the root of your current distress, and equipping you with stabilization techniques so you have solid ground beneath you before any processing begins.

When you do move into the processing phases, here's what it typically looks like:

You bring a specific memory to mind — along with the image, the belief it created about yourself, and where you feel it in your body. Your therapist then guides you through sets of bilateral stimulation — most commonly, following a moving finger or light with your eyes from side to side, though tapping or auditory tones can also be used.

After each set, you simply notice what comes up — a thought, an image, a sensation, an emotion — without having to analyze or narrate it. Your therapist guides you back in for another set. This continues until the distress connected to the memory reduces significantly, and until a more adaptive, realistic belief about yourself can take its place.

It sounds deceptively simple. The experience of it is often profound.

What Does Bilateral Stimulation Actually Do?

This is the question researchers are still working to fully answer, and it's part of why EMDR draws skepticism from some corners.

The leading theory is that the bilateral stimulation — the back-and-forth movement — mimics what happens during REM sleep, the phase where the brain naturally processes and consolidates memories. By activating both sides of the brain while simultaneously holding the traumatic memory in mind, EMDR appears to help the brain reprocess the memory in a way that reduces its emotional charge. The memory doesn't disappear — but it stops feeling like a live threat.

What's clear from the research is that it works, even if the precise mechanism continues to be studied.

Does EMDR Really Work? What the Evidence Shows

The short answer is yes — and the evidence behind it is substantial.

EMDR is recognized as a first-line treatment for PTSD by major health organizations around the world. Multiple large-scale clinical trials have found it to be effective at significantly reducing or eliminating PTSD symptoms, often in fewer sessions than traditional talk therapy. Some studies have found that 84–90% of single-trauma survivors no longer met the diagnostic criteria for PTSD after just a few sessions of EMDR.

It's worth noting that EMDR isn't only for people with a formal PTSD diagnosis. It has also shown effectiveness for anxiety, depression, grief, phobias, and the kind of complex, relational trauma that doesn't always fit the clinical definition of PTSD but still quietly runs someone's life.

What EMDR Is Not

A few things worth clarifying:

• EMDR is not hypnosis. You are fully conscious and in control throughout the process.
• EMDR doesn't require you to describe your trauma in detail. Unlike some approaches, EMDR doesn't ask you to talk through everything that happened. The processing happens internally, with your therapist guiding the structure rather than extracting a narrative.
• EMDR is not a quick fix. The number of sessions needed varies widely depending on the nature and complexity of what you've experienced. Some people process a specific memory in a handful of sessions; others with more complex or layered trauma histories work with EMDR over a longer period.

EMDR at Reset Counselling in Barrie

At Reset Counselling, EMDR is offered as part of our trauma and PTSD therapy services. Tamari Thompson-Kraft, RP, is a skilled EMDR therapist who works with individuals navigating recent or long-standing traumatic experiences — alongside other evidence-based approaches including IFS (Internal Family Systems), CPT (Cognitive Processing Therapy), and mindfulness-based therapy.

If you've been living with the effects of trauma — intrusive memories, hypervigilance, emotional numbness, or the sense that the past keeps showing up in the present — you don't have to keep carrying that alone.

Learn more about our approach to trauma and PTSD therapy in Barrie, or book a session online to take the first step.

In-person sessions are available at our Barrie location. Virtual therapy is available across Ontario.