How does EMDR actually work? An honest answer to the most common question

Your brain processes most experiences on its own. Something happens, you sleep on it, and in time you can think back to it without your body reacting. It has become a story.

With some experiences that does not happen. Usually these are moments where too much happened at once: too intense, too fast, or for too long. That experience is stored the way it came in. Including the images, the sounds, the smell, the tension in your body and the conclusion you drew about yourself at the time.

You only notice the consequence later. A sound, a smell or a situation switches the whole reaction back on. Your heart rate rises, you become watchful, you avoid something, without consciously thinking about the event. To you it feels like reacting to nothing. To your nervous system it is entirely logical.

During EMDR we ask you to go back to the most charged moment of such a memory. While you hold that image, you do something else at the same time: you follow a hand or a light bar with your eyes, or you listen to tones alternating left and right. This is called bilateral stimulation.

After a set of about thirty seconds we stop and ask what you notice. Nothing more. You do not have to explain anything at length. What you say might be an image, a thought, or just that your shoulders feel heavy. We continue with whatever is there.

We use a scale from 0 to 10 to track how distressing the image is at that moment. At the start of a session and at the end. That way you see the change yourself.

The explanation with the strongest support at the moment is working memory theory. Your working memory can only hold a limited amount of information at once. Think of how many things you can keep in mind while dialling a phone number.

If you retrieve a memory and perform an attention demanding task at the same time, the two have to share that space. The memory arrives less sharply and less vividly. And because a memory is stored again every time you retrieve it, it gets stored in that weakened form.

Other explanations circulate as well, including one about the role of REM sleep. What they share is this: it is not the eye movement in itself, it is the fact that your attention is divided while you hold the memory.

EMDR erases nothing. The memory stays, and it belongs to your life. What changes is how hard it lands and what your body does with it.

EMDR is not hypnosis either. You stay awake, your eyes are open, you are in conversation and you can stop at any point. You keep control throughout the session.

And it is not a miracle cure. For a single defined event, three to six sessions are often enough. When experiences have piled up over years it takes longer, and sometimes EMDR is not the right starting point at all. In an acute crisis, with severe dissociation or an unsafe home situation, something else comes first.

The first thing that usually stands out is tiredness. Processing takes energy, and the evening after a session is rarely a good evening for big plans.

Then comes the distance. People describe it as: it is still there, but it is further away. The image no longer arrives uninvited, or it does arrive but it does less.

And the conclusion attached to it often shifts. From "I should have seen it coming" to "I did what I could at the time". That shift matters at least as much as the image settling down, and it is why people sometimes say afterwards that something changed in how they see themselves.