How does EMDR work?

EMDR stands for Eye Movement Desensitisation and Reprocessing. The name is technical, but the problem it addresses is deeply human: some experiences do not settle. Years later they still arrive with full colour, full charge and full urgency — as if the past has not yet learned that it is over.

EMDR is often used when experiences remain vivid, intrusive or emotionally charged. The aim is not to erase memory. The aim is to help the nervous system relate to the memory differently.

To understand EMDR, it helps to understand what it is trying to work with.

Ordinarily, experiences are processed and filed. Something difficult happens, we feel it, we make sense of it, we talk about it, we sleep on it, and over time it becomes a memory with a date attached. It belongs to the past.

But when an experience overwhelms our capacity to process it, something different can happen. The memory is stored in an unprocessed, fragmented form — images, sensations, emotions and beliefs held with the same intensity they had at the time. A smell, a tone of voice or a passing thought can reopen the file, and suddenly the body responds as if the event were happening now.

This is why telling someone to "just move on" so rarely works. The memory has not been integrated. It is not filed under the past; it is still running as the present.

In an EMDR session, once preparation is complete, you are asked to bring a specific memory to mind — the image, the emotion, the body sensation and the belief that goes with it (something like "I'm not safe" or "it was my fault"). While you hold that in awareness, the therapist guides you through sets of bilateral stimulation: typically side-to-side eye movements, alternating taps or tones.

Between sets, you simply notice what comes up. You do not need to describe everything, analyse anything, or make yourself feel more than you feel. Something in the process allows the memory network to begin linking up with other, more adaptive information — the parts of you that know you survived, that it is over, that it was not your fault.

Over the course of the work, the memory typically loses its charge. People often describe the same event feeling "further away", "smaller" or "like it belongs to the past now". The facts remain. The felt urgency fades.

The honest answer is that researchers are still refining the explanation, but several strands of evidence converge.

One account links bilateral stimulation to the mechanisms of REM sleep, the stage in which the brain naturally processes emotional experience. Another points to working memory: holding a distressing image in mind while tracking a moving target taxes attention, which reliably reduces the vividness and emotional intensity of the image. A third emphasises dual awareness — being anchored in the safety of the present moment while touching the past, so the memory can be revisited without being relived.

Whatever the precise mechanism, the clinical picture is consistent enough that EMDR is recommended in international guidelines, including by the World Health Organization, as a treatment for post-traumatic stress.

Good EMDR preparation matters. The work includes history-taking, resourcing, consent, pacing and regular checking-in.

EMDR is described as an eight-phase approach, and most of those phases are not eye movements at all. Before any processing begins, we take time to understand your history, identify what we are working towards, and build resources — ways of grounding and steadying yourself that you can use in and out of sessions. Processing only begins when there is enough stability to support it.

You remain in control throughout. You can pause or stop at any point. Nothing is done to you; the work happens with you, and your feedback shapes the pace. If something feels too fast, we slow down. That is not a detour from the method — it is the method.

People are often surprised by how ordinary the experience is. You sit in a chair, awake and fully present. There is no trance, no losing yourself, no requirement to perform distress.

During the sets, most people describe their mind moving on its own — images shifting, other memories surfacing, thoughts arriving sideways, emotions rising and passing. Some sessions are intense; others are quiet and almost dreamlike. Sometimes apparently unrelated material appears, and this is usually the point: the brain is following its own associative threads, linking the stuck memory into wider networks. My job is to keep the process safe and moving, not to steer where it goes.

Afterwards, processing often continues for a day or two. Vivid dreams, new memories, unexpected calm and passing waves of emotion are all common and all normal. We plan for this together, so nothing that happens between sessions takes you by surprise.

It depends on what we are working with. For a single distressing event in an otherwise stable life, meaningful change can happen within a handful of processing sessions — this is where EMDR earned its reputation for speed. Where the difficulty is layered — many events, or wounds that began early and repeated — the work is naturally longer, because there are more threads to follow and more groundwork to lay first.

Preparation time also varies from person to person. Someone with steady resources may move to processing quickly; someone whose nervous system has been braced for decades may need longer to build the stability that makes processing safe rather than re-traumatising. That slower start is not lost time. It is the foundation everything else stands on.

EMDR is best known as a trauma therapy, and single-incident trauma — an accident, an assault, a medical event — is where its evidence base is strongest. But "trauma" in the clinical sense is broader than catastrophe.

The same unprocessed-memory logic can apply to experiences of humiliation, rejection, loss and chronic criticism — the smaller, repeated wounds that shape beliefs like "I am not enough" or "I must not need anyone". EMDR is increasingly used with anxiety, phobias, grief and low self-worth where these are rooted in memory. In complex or developmental trauma, EMDR tends to be woven carefully into longer relational work rather than used as a standalone technique.

EMDR is one possible tool within therapy, not a performance and not a shortcut around relationship.

In my practice, EMDR sits inside a relational, trauma-informed frame. The method is never more important than the relationship. Some people come specifically for EMDR and we contract for focused work. For others, it emerges as one strand within longer therapy — used when a particular memory keeps interrupting the wider work, then set aside again.

I am also honest about what EMDR is not. It is not hypnosis: you remain awake, aware and present. It is not a memory eraser, and it is not magic — although when a memory that has dominated someone's life for twenty years finally settles, it can feel remarkable to both of us.

*Will I lose control?* No. You are awake and present throughout, and you can stop at any moment. Many people find EMDR gives them more sense of control over the memory, not less — often for the first time.

*What if I can't handle what comes up?* This is exactly what the preparation phase exists for. We do not begin processing until you have reliable ways of steadying yourself, and we practise them together before they are ever needed. If something intense arises, we have a plan — built in advance, with you.

*What if I don't remember things clearly?* You do not need a complete narrative. EMDR works with what is there — an image, a body sensation, a feeling with no story attached. Fragments are enough; the nervous system knows where the charge is, even when the biography is patchy.

If there are specific experiences that still feel active — memories you avoid, images that intrude, situations your body reacts to out of all proportion to the present — EMDR may be worth exploring. If what you carry is more diffuse, the answer may still be yes, but the route in will be slower and more relational.

The only way to know properly is a conversation. A first session is a chance to look at what you are carrying and decide together whether EMDR, or another way of working, fits the shape of it.