What happens during EMDR treatment for trauma? Why therapy doesn’t always need words
During parts of an EMDR session, a person brings to mind aspects of a traumatic memory while attending to bilateral stimulation – often following guided movements from one side of the visual field to the other.
The individual remains awake, aware, and in control throughout. They can pause. They can communicate with the therapist. Nothing is being erased; EMDR is not hypnosis.
While the mechanisms involved are scientifically interesting, clinically, EMDR poses a bigger question: what happens to a traumatic memory when we bring it back into awareness, in a structured and supported way?
At Harbor, EMDR therapy can form one part of our Trauma Recovery Programme when clinically appropriate. Its use is informed by the person’s history, current symptoms, safety, functioning, and readiness for trauma-focused work.
What actually happens during EMDR therapy?
“The eye movements are the most visible part of EMDR, but they are not the whole treatment.”
EMDR (or Eye Movement Desensitisation and Reprocessing) is a structured, phased psychological treatment used particularly in the treatment of PTSD.
- Before memory processing begins, there is assessment and preparation.
- The clinician needs to understand what somebody is experiencing, establish an appropriate treatment plan, and ensure the person has ways of managing distress during and between sessions.
- During the processing itself, the person is asked to bring a specific target memory to mind, alongside associated thoughts, emotions, and bodily responses.
- While doing so, they attend to sets of bilateral stimulation. This most commonly involves following lateral eye movements, although alternating taps or auditory tones may also be used.
The clinician pauses between sets to ask what the person notices. What emerges may change as processing continues, and subsequent sets work with that material.
Why bilateral stimulation?
This is where EMDR becomes scientifically fascinating, as there is still debate around precisely how it works. We have stronger evidence that EMDR reduces PTSD symptoms than we have certainty about the specific mechanism responsible for those effects.
“We know more about whether EMDR can help with trauma than we do about how or why every component works.”
One prominent explanation is the working-memory account.
- Recalling a traumatic memory requires cognitive resources. Performing a second attention-demanding task at the same time may compete for those limited resources, potentially reducing the vividness and emotional intensity of the memory as it is recalled.
Other theories have been proposed, including accounts involving memory reconsolidation and the orienting response.
That uncertainty is worth being clear about. Claims that EMDR “rewires the brain,” activates different cerebral hemispheres, or “removes” traumatic memories go beyond what the evidence allows us to say confidently.
Trauma doesn’t always come back as a coherent story
A person may understand intellectually that an event happened in the past while continuing to experience intrusive imagery, sudden changes in arousal, bodily tension, powerful emotional states, or threat responses that feel immediate in the present.
A memory can make sense cognitively while remaining highly activated emotionally and physiologically.
Therapy is sometimes imagined as a process of finding the right words, telling the complete story, and understanding what happened. Language and meaning-making can be enormously important, but traumatic experiences can also be worked with in other ways.
In such situations, EMDR provides a structured way of engaging with distressing memories while paying attention to what arises without relying on detailed verbal narration.
Do you have to describe everything during EMDR?
Not necessarily. EMDR still requires engagement with traumatic material – the clinician also needs sufficient information to assess risk, formulate treatment, identify appropriate targets, and understand what is happening during the therapeutic process.
But a person does not necessarily have to narrate every detail of a traumatic event for EMDR processing to take place.
“Less narration should not be confused with less therapeutic work.”
Where difficult experiences are associated with intense shame, are challenging to put into words, or are remembered in a fragmented way, not having to recount the event in exhaustive detail can prove especially meaningful.
What does the evidence for EMDR support?
EMDR has a substantial evidence base in the treatment of PTSD.
It is recommended in major clinical literature, including guidance from the World Health Organization and NICE, as a trauma-focused psychological intervention for appropriate patients with PTSD.
Where the evidence becomes less certain is when claims extend beyond established trauma-related indications. Research has explored EMDR across a range of other mental health conditions, but the evidence varies by condition and does not render EMDR a universal treatment.
EMDR in trauma treatment: is it right for everyone?
Because bilateral stimulation looks so distinctive, eye movements can become the defining feature of EMDR in the public imagination. Clinically, though, the work begins before the eye movements do.
Trauma history, current symptoms, dissociation, risk, co-occurring difficulties, substance use, alcohol, sleep, stability, and readiness for trauma processing can all influence treatment planning. Pacing matters. Preparation matters. So does the therapeutic relationship.
At Harbor, EMDR is one modality that may be incorporated into an individually formulated Trauma Recovery Programme where clinically indicated. Treatment is built entirely around the person, and delivered in a private, luxury environment designed for healing.
From a clinical perspective, the first question isn’t how EMDR works. It is whether EMDR is the right treatment for this person, in this context, at this stage of their recovery.
Selected clinical references:
- https://www.nice.org.uk/guidance/ng116
- https://pmc.ncbi.nlm.nih.gov/articles/PMC6592320/
- https://www.who.int/teams/mental-health-and-substance-use/treatment-care/mental-health-gap-action-programme/evidence-centre/conditions-related-to-stress/posttraumatic-stress-disorder-(ptsd)–psychological-interventions—adults
- https://www.who.int/teams/mental-health-and-substance-use/treatment-care/mental-health-gap-action-programme
- https://pubmed.ncbi.nlm.nih.gov/23266601/
- https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2018.01395/full
