"Moving your eyes back and forth fixes trauma? That sounds like a scam."
That is most people's first reaction to EMDR, and the doubt is reasonable. Eye Movement Desensitization and Reprocessing (EMDR) does sound odd: you hold a distressing memory in mind while following the counsellor's fingers with your eyes from side to side, or while being tapped alternately on each side. And then, many people find, the feeling that memory carries changes within a few sessions.
EMDR was discovered by chance by American psychologist Francine Shapiro in 1987 and developed into an eight-phase approach. Over more than thirty years it has accumulated a large body of research and become one of the treatments for post-traumatic stress recommended by the World Health Organization and clinical guidelines in many countries. This page covers what it is, how it actually works, why you do not have to describe the trauma in detail, who it suits, and where its limits are.
EMDR has its own way of understanding trauma. Normally, after we go through an event, the brain digests it over the following days, especially during sleep: linking it to other experiences, drawing out what is useful, and filing it under "the past." But when an event is too overwhelming or too sudden, the brain cannot keep up, and the memory is "frozen" in its raw state: the images, sounds, smells, bodily reactions and the thoughts of that moment ("I'm going to die," "it's my fault") are all stored exactly as they were.
So years later, a smell or a similar scene can replay the whole memory intact, and the body reacts as if that moment were happening now. That is not weakness. It is a memory that was never properly filed.
What EMDR does is let you reconnect with that memory under safe conditions while giving the brain bilateral stimulation (eye movements, taps or tones), so the brain can complete the processing it could not finish at the time. The mechanism is still debated; the most accepted explanation at present is that bilateral stimulation takes up part of working memory, making the recollection less vivid and less distressing, which gives the brain room to link it to other experience instead of being flooded by it.
After processing, the memory is still there, but it becomes "something that happened." You remember, but the body no longer replays it. And nothing in the process requires you to narrate the event. You recall it in your own mind; the counsellor only asks "what do you notice now?" and you can answer in a sentence.
EMDR does not ask you to forget, and it does not make you relive. It helps the brain put a stuck memory back where it belongs.
EMDR follows a clear eight-phase protocol, and "processing" is only one part of it. Here is what actually happens:
No processing in the first session. The first one to three sessions are history and preparation: the counsellor learns about your situation, the outline of the trauma (no details needed), your current symptoms, any tendency to dissociate, and whether your life is stable enough. Then preparation: explaining how EMDR works and practising ways to steady yourself, such as a "safe place" image, breathing and grounding skills. How long this phase takes depends on your situation; complex trauma may need weeks or even months of preparation. That is normal, and necessary.
At the processing stage, the counsellor "sets up the target" with you: "Of that event, which image troubles you most right now?" "When you hold that image, what negative belief do you have about yourself?" (for example "I'm not safe," "I'm worthless," "it was my fault") "What would you rather believe?" "On a scale of zero to ten, how distressing is it now?" "Where do you feel it in your body?" Then the bilateral stimulation begins. After each set of about thirty seconds, the counsellor asks one thing: "what do you notice now?" You can answer with anything: an image, a feeling, a thought, or "nothing much." Then the next set.
Very little. The counsellor may ask you to note any memories, dreams or disturbances that surface between sessions, and to practise the grounding methods from preparation. Processing itself cannot be done alone at home.
Very. Eight phases: history, preparation, assessment, desensitization, installation, body scan, closure, re-evaluation. Every session ends with closure, making sure you leave stable even if processing is unfinished. The counsellor follows a standard protocol but adjusts the pace to your responses.
They will teach the grounding methods in preparation, and those are yours to keep. But processing itself is not a skill; it is a process that happens under the counsellor's guidance. During processing the counsellor says very little, mostly "follow my hand" and "what do you notice now." The change is something your brain does on its own.
Here is a common flow for a processing session. Preparation sessions have a completely different rhythm, mostly conversation and practice:
Sessions are usually sixty to ninety minutes. For a single-event trauma, once preparation is complete, processing itself may take three to eight sessions. Prolonged, repeated trauma may take months or more than a year, with preparation making up a larger share. Usually weekly; some counsellors schedule processing sessions closer together.
Allen Koo
Registered Social Worker
MSW
你好呀！我是 Allen 👋 很高興在這裡遇見你。能鼓起勇氣尋求支援，其實已經是你照顧自己非常棒的第一步了！ 無論你最近是被生活壓力壓得喘不過氣、正在經歷創傷的療癒過程、被長期身體不適所困擾，還是夜夜失眠、心思亂成一團——請記得，你真的不需要自己硬撐著。
EMDR is built for people with "a memory that stays stuck." A rough guide:
EMDR is often combined with other approaches: another orientation to build stability first, EMDR to process the specific memories, then back to the other orientation to rebuild life afterwards.
EMDR's strongest evidence is for post-traumatic stress: accidents, assaults, disasters, medical trauma, witnessing harm to others. In recent years it has also been used for other concerns with a "memory root": panic, phobias, complicated grief, self-image damaged by bullying or humiliation, and the specific events beneath a depression. What they share: the concern can be traced to one or a few specific experiences, and those experiences are still stored at their original intensity. These are some of the concerns EMDR is most often paired with:
When the past keeps shaping the present, and body and mind feel stuck in that moment.
Worry that will not switch off, a body that stays tense, and difficulty relaxing.
The road with no timetable after losing a loved one, a relationship or an identity.
How you see yourself, your sense of worth, and the voice that keeps criticising you.
Persistent low mood, loss of interest and motivation, and a sense that nothing matters.
An approach that sounds strange collects more misconceptions than most:
"You just move your eyes and it's fixed. Like magic."
Eye movements are one option within one of eight phases. Without the preparation and assessment before and the installation and closure after, eye movements on their own mean nothing. And whether the eye movement component contributes independently is still debated. EMDR works because the whole protocol works.
"It's hypnosis."
You are awake throughout, you know where you are, and you can raise a hand to stop at any time. EMDR specifically emphasizes keeping "one foot in the past and one in the present," and the counsellor makes sure you do not fall completely into the memory. It is the opposite direction from hypnosis.
"You have to tell the whole story in detail."
You do not. The counsellor only needs an outline. During processing you recall it in your own mind, and after each set you say in one sentence what you noticed; "I'd rather not say" is fine. Many people only dare to begin because of this.
"One or two sessions and it's done."
For a single-event trauma, once preparation is complete, processing really can be quick. But preparation itself takes time, and prolonged, repeated trauma takes months or longer. Any claim of "results in one session" deserves suspicion.
EMDR's effectiveness for post-traumatic stress is well established. The World Health Organization's 2013 guidelines on conditions related to stress recommend EMDR alongside trauma-focused CBT for post-traumatic stress in adults; the UK's National Institute for Health and Care Excellence (NICE) guideline on post-traumatic stress disorder recommends EMDR for adults; and a Cochrane systematic review found EMDR about as effective as trauma-focused CBT and more effective than no treatment or general support. EMDRIA keeps an updated list of research on its website.
A few things are worth knowing. First, the strongest evidence is for post-traumatic stress from single or few events; EMDR is still useful for prolonged, complex trauma, but there is less research and much longer preparation is needed. Second, whether the eye movement component is necessary remains debated among researchers, but this does not affect the conclusion that the approach as a whole works. Third, research on EMDR beyond post-traumatic stress (panic, depression, chronic pain) is growing, but the evidence is not yet as strong.
EMDR is effective for the right situations, but it has clear boundaries:
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