How o cérebro reprocessa memórias difíceis

Have you ever tried to talk about a difficult memory and realized that words don't come close to what you feel? Even when you describe in detail what happened, your body keeps reacting — your chest tightens, your breathing gets stuck, the sense of danger won't go away. This happens because traumatic memories aren't stored only as narrative: they are inscribed in deeper layers of the brain, in neural networks that language cannot reach. EMDR works precisely in that place.

This article is an invitation to understand, in accessible terms, what happens inside the brain — and inside a session — when a memory is reprocessed. It is also an attempt to demystify this approach that, despite decades of research and international recognition, still sparks curiosity and questions in those who hear about it for the first time.

How EMDR Came to Be: An Accidental Discovery

EMDR (Eye Movement Desensitization and Reprocessing) was developed by American psychologist Francine Shapiro in the late 1980s. The initial discovery was nearly accidental: Shapiro was walking in a park and noticed that some disturbing thoughts that were bothering her lost intensity when her eyes moved rapidly from side to side. Intrigued, she began testing the effect systematically — first with friends, then with patients — and the method gradually took shape until it became the approach we know today.

What seems simple at first glance — moving your eyes from side to side while accessing a memory — has revealed, over decades of research, profound and measurable effects on the brain. Today, EMDR is recommended by organizations such as the World Health Organization, the American Psychological Association, and the National Institute for Health and Care Excellence (NICE) of the United Kingdom as a first-line approach for trauma treatment.

What Actually Happens in a Session

An EMDR session follows a fairly precise structure, although the content varies greatly from person to person. The first part is always stabilization — work to ensure you have enough internal resources to handle what will emerge. This may include breathing exercises, grounding in the present, and building an internal safe place. This preparatory work is essential: no one enters a well-conducted EMDR session without first having a foundation of emotional regulation.

Next, we work with a specific memory. You choose a particular moment — an image, a sound, a scene — that represents the difficult event. We identify the negative belief associated with that memory ("I am powerless," "it was my fault," "the world is not safe") and the positive belief you would like to feel instead ("I have strength," "it wasn't my fault," "I can protect myself").

Then bilateral stimulation begins. In the most common setup, you follow with your eyes the therapist's fingers, which move from side to side across your visual field, without needing to turn your head. Other forms of bilateral stimulation include alternating taps on the knees or alternating sounds through headphones. Meanwhile, you hold the memory in mind — you don't need to retell everything, you don't need to speak; you just remember.

Bilateral stimulation lasts about 24 to 30 seconds each time. When it stops, I ask: "what's coming up now?" And you tell me what appeared — it could be an emotion, a new image, a body sensation, a related memory. Without judgment, without immediate interpretation. Just tracking what emerges.

This process is repeated in sets — with pauses, with check-ins, with care — until something shifts. And it does shift. What was vivid and oppressive gradually becomes more distant. The emotions change. The body relaxes. The negative belief loses its hold, and the positive belief begins to take its place.

The Neuroscience Behind Eye Movements

Why does moving your eyes help process memories? This is one of the most frequent questions — and perhaps one of the most legitimate. The answer is still being built by science, but some hypotheses are well supported.

The first has to do with the brain's information processing system. Shapiro proposes that when something affects us deeply, the brain can "freeze" when trying to process that experience — like a file that became corrupted. Bilateral stimulation appears to help unlock this system, allowing the memory to be reincorporated into our life story in an integrated way.

The second hypothesis comes from the Dual Attention State Theory. The idea is simple and elegant: bilateral stimulation keeps the brain occupied with an external task (tracking the movement), while the memory is accessed internally. This balance between external and internal focus appears to reduce the emotional intensity of the memory, without the person needing to relive it at the edge of what they can bear.

There is also research suggesting effects of bilateral stimulation on the thalamus and on working memory systems, facilitating the integration of memory fragments that were dissociated. Neuroimaging studies show, after EMDR sessions, reduced activity in the amygdala (the alarm region) and increased connectivity between regions associated with autobiographical memory and emotional regulation.

In short: EMDR is neither magic nor a placebo effect. It is a structured way of helping the brain do what, under ordinary circumstances, it does on its own — integrate experiences — but which, after traumatic events, it cannot complete without help.

Who EMDR Is For

EMDR is used primarily for the treatment of trauma and post-traumatic stress. But the list of applications has grown over the years and now includes:

• Post-Traumatic Stress Disorder (PTSD) — simple and complex
• Anxiety disorders (generalized anxiety, phobias, panic)
• Depression associated with traumatic events
• Complicated grief
• Attachment difficulties and relational patterns
• Eating disorders with a traumatic basis
• Performance and performance anxiety (athletes, artists, professionals)

One important thing: EMDR is not contraindicated for "people who can't talk about the trauma." On the contrary — for those who have difficulty putting things into words, EMDR can be especially useful, precisely because verbalization is not the main channel of the work.

What EMDR Doesn't Do

It's important to clear up some misunderstandings. EMDR is not hypnosis — you remain conscious, present, in control of the process the entire time. Nor is it erasure: the memory remains accessible, but without the emotional weight that kept it "stuck." And it is not an instant technique: although some people feel significant relief in the first sessions, the process usually takes a few weeks to months, depending on the complexity of the case.

Another important point: EMDR does not replace the therapeutic relationship, nor the stabilization work. It is part of a process — not a shortcut. That is why, in my practice, I work with EMDR integrated with other approaches, including body regulation resources and, when needed, Brainspotting.

What to Expect from Your First Session

If you are considering starting EMDR, what will happen in the first session is quite different from what many people imagine. We won't jump straight into a difficult memory. Instead, we will talk — about your history, your resources, your current struggles, your goals for therapy. We will also do a careful assessment to understand whether you are at an appropriate moment to begin EMDR work or whether we first need to build more stability.

I explain the method, answer your questions, and only then — when you feel ready and safe — we begin working with specific memories. The entire process is paced to you, with pauses and care.

A patient once told me, after a few sessions: "It's as if the memory is still there, but it stopped bleeding." That's exactly it — it's not about forgetting. It's about remembering without being hurt.

EMDR as a Possibility

EMDR is one of the most powerful tools contemporary psychotherapy offers for trauma work. Not because it works miracles — it doesn't — but because it respects the complexity of the brain and offers a structured, evidence-based path to reorganize what got stuck.

If you live with memories that keep hurting, that appear without warning, that affect your sleep, your relationship with your body, your ability to be present — it's worth considering that there is a path. And that path may include EMDR.

If you'd like to talk about this, the first step can be simple: an initial conversation, with no commitment. Sometimes, just starting to speak is enough for the memory to stop hurting.

About the Author

Dr. Mariana Lage · CRP 01/8814 · Clinical Psychologist

Trauma specialist, trained in EMDR through TraumaClinic / EMDR Brasil and in Brainspotting through the Dr. David Grand method. Online sessions for Brazil, Brazilian women abroad, and English-speaking international clients.

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