What Is EMDR Therapy and How Does It Work?

EMDR therapy is a structured, evidence-based psychotherapy that helps the brain reprocess traumatic memories stored in their raw, emotionally charged form. EMDR stands for Eye Movement Desensitization and Reprocessing. It works by pairing guided bilateral stimulation with focused memory recall to reduce the emotional distress attached to past experiences.

Developed in 1987 by American psychologist Dr. Francine Shapiro, EMDR is now endorsed by the World Health Organization, the American Psychiatric Association, and the U.S. Department of Veterans Affairs. It is used by licensed clinicians in more than 130 countries worldwide.

Unlike traditional talk therapy, EMDR does not require you to describe your trauma in detail or complete homework between sessions. The process works through structured phases designed to safely bring distressing memories to resolution.

Key Takeaways

• EMDR stands for Eye Movement Desensitization and Reprocessing, a structured eight-phase therapy that uses bilateral stimulation to help the brain reprocess stuck traumatic memories.
• Research shows that 84% to 90% of single-trauma survivors no longer met PTSD diagnostic criteria after just three 90-minute EMDR sessions (EMDR Institute, 2024).
• A Kaiser Permanente-funded study found that 100% of single-trauma victims and 77% of multiple-trauma victims no longer carried a PTSD diagnosis after six EMDR sessions.
• EMDR is endorsed as a first-line trauma treatment by the WHO, the American Psychiatric Association, and the U.S. Department of Veterans Affairs.
• Beyond PTSD, EMDR is clinically applied to anxiety disorders, depression, OCD, phobias, dissociative disorders, grief, chronic pain, and addiction.

What Does EMDR Stand For?

EMDR stands for Eye Movement Desensitization and Reprocessing. Each term describes a core element of the treatment.

“Eye movement” refers to the bilateral stimulation technique used in each session. “Desensitization” means reducing the emotional charge attached to a distressing memory. “Reprocessing” refers to storing that memory in an adaptive, integrated way so it no longer triggers a survival stress response when recalled.

The Science Behind EMDR Therapy

EMDR is built on the Adaptive Information Processing (AIP) model, a framework developed by Dr. Shapiro. The AIP model holds that the brain has a natural system for processing and integrating emotional experiences, much like the body heals physical wounds on its own.

Traumatic events can overwhelm this system. When that happens, the memory gets stored in its original, unprocessed state, along with all the distorted thoughts, physical sensations, and emotions present at the time. Any reminder of the experience can reactivate that stored response in its full intensity.

EMDR targets these stuck memories directly. Researchers believe the bilateral stimulation used in sessions activates neurological mechanisms similar to those involved in REM sleep, the stage where the brain naturally consolidates and integrates daily experience. Over repeated sets of stimulation, the memory loses its emotional charge and becomes stored adaptively.

Understanding what processing trauma actually means is central to understanding why EMDR produces results where years of talk therapy sometimes have not.

How Does EMDR Therapy Work?

In a standard EMDR session, your therapist guides you to hold a distressing memory in mind while following a bilateral stimulus, most commonly the therapist’s moving hand or a light bar tracked with your eyes. This dual-attention state, simultaneously holding the internal memory and tracking an external stimulus, is what allows the brain to begin reprocessing what was previously frozen.

Between each set of bilateral passes, you report whatever comes up in thoughts, feelings, or body sensations. Your therapist does not interpret or direct this content. The process trusts the brain’s natural healing capacity to move the memory toward resolution.

Sessions run 60 to 90 minutes. Processing continues across multiple sessions until the target memory no longer generates distress and a positive belief about yourself feels fully true in relation to it.

What Is Bilateral Stimulation in EMDR?

Bilateral stimulation is the defining feature of EMDR therapy. It involves alternating sensory input between the left and right sides of the body. The three primary forms used by trained EMDR therapists are guided eye movements, auditory tones alternating between left and right headphone channels, and tactile tapping applied alternately to the knees or hands.

Eye movements are the most commonly used and most researched form. The therapist typically moves two fingers horizontally, completing roughly 20 to 30 passes per set while you track the movement. A 2024 meta-analysis published in the Journal of Traumatic Stress confirmed that EMDR produces very large treatment effects for PTSD, with effect sizes of d = 1.88 from baseline to one-year follow-up, and over 80% of participants no longer meeting PTSD criteria at that point.

The 8 Phases of EMDR Therapy

EMDR follows a standardized eight-phase protocol. Phases one and two build the clinical foundation. Phases three through eight are repeated across sessions until each targeted memory reaches full resolution.

1. History Taking and Treatment Planning. Your therapist gathers a detailed clinical history, identifies the specific memories driving current symptoms, and determines that EMDR is clinically appropriate for your presentation.
2. Preparation. Your therapist explains the full EMDR process, establishes informed expectations, and teaches grounding and stabilization skills you can use if emotional intensity peaks during or between sessions. This phase typically lasts one to four sessions and is essential for safe reprocessing.
3. Assessment. You and your therapist identify a specific target memory and its most distressing image. You name the negative belief it generated (for example, “I am helpless”) and the positive belief you want to hold instead (for example, “I am in control now”). Your SUDS score is recorded as a baseline measure of distress.
4. Desensitization. Your therapist initiates bilateral stimulation while you hold the target memory and negative belief in mind. After each set, you report whatever emerges without censoring it. Reprocessing continues until your SUDS score reaches zero or near-zero.
5. Installation. The focus shifts to the positive belief. Bilateral stimulation continues until that belief feels fully true and integrated in relation to the processed memory, rated via the Validity of Cognition (VOC) scale.
6. Body Scan. You scan your body from head to toe for any residual physical tension or discomfort connected to the memory. Any remaining physical activation is addressed with additional bilateral stimulation.
7. Closure. Your therapist uses grounding and calming techniques to ensure you leave each session feeling stable and contained, whether or not full processing was completed during that session.
8. Reevaluation. At the start of each subsequent session, your therapist checks whether previously processed memories remain resolved and identifies new targets for continued work.

For a single traumatic incident, three to six sessions are typically sufficient. Complex trauma, childhood abuse, and long-term relational trauma often require eight to twelve sessions or more.

What Conditions Does EMDR Therapy Treat?

EMDR was developed for post-traumatic stress disorder, but its clinical applications have expanded significantly as the research base has grown. A 2019 review by Maxfield confirmed positive outcomes for EMDR across anxiety, depression, OCD, chronic pain, and addiction, alongside trauma.

EMDR is commonly used to treat:

• Post-traumatic stress disorder (PTSD)
• Anxiety disorders, including panic disorder and specific phobias
• Depression and persistent depressive disorder
• Obsessive-compulsive disorder (OCD)
• Complicated grief and bereavement
• Childhood trauma, abuse, and childhood emotional neglect
• Dissociative disorders, including dissociative identity disorder
• Eating disorders and body image disturbances
• Chronic pain and somatic symptom presentations
• Addiction and substance use disorders
• Emotional dysregulation rooted in early developmental experiences

For people whose current symptoms are driven by memories they cannot fully access or verbalize, including those with repressed memories of early trauma, EMDR’s non-verbal reprocessing approach is often preferred over approaches that depend on narrative recall.

EMDR Therapy vs. Cognitive Behavioral Therapy

Both EMDR and cognitive behavioral therapy (CBT) are evidence-based and appear on clinical guidelines for trauma and anxiety. They differ significantly in method, session demand, and what they ask of the client.

The WHO’s 2013 clinical guidelines explicitly noted that, unlike trauma-focused CBT, EMDR does not require detailed descriptions of traumatic events, prolonged exposure to distressing material, or homework assignments. For clients who cannot tolerate sustained verbal recounting or who have previously struggled with exposure-based approaches, EMDR is often the more accessible starting point.

How Effective Is EMDR Therapy?

The evidence base for EMDR is extensive and consistent. Controlled studies show that 84% to 90% of single-trauma survivors no longer met PTSD diagnostic criteria after just three 90-minute sessions. A Kaiser Permanente-funded study found that 100% of single-trauma victims and 77% of multiple-trauma victims were PTSD-free after six 50-minute sessions. In a separate study of combat veterans, 77% no longer carried a PTSD diagnosis after 12 sessions.

EMDR outperformed fluoxetine (Prozac) for PTSD treatment in a randomized clinical trial (Van der Kolk et al., 2007). A UK National Health Service analysis identified EMDR as the most cost-effective intervention for PTSD out of 11 treatment types assessed.

More than 30 randomized controlled trials support EMDR’s effectiveness. First-line endorsements have come from the WHO, the American Psychiatric Association, the U.S. Departments of Veterans Affairs and Defense, and the UK’s National Institute for Health and Care Excellence.

Is EMDR Therapy Controversial?

The effectiveness of EMDR is not disputed by mainstream clinical science. The controversy that exists centers on the mechanism, specifically whether bilateral eye movements are the active ingredient, or whether results derive from the exposure and cognitive elements that EMDR shares with other evidence-based therapies. Some researchers describe EMDR as a structured exposure approach that adds eye movements as a component.

The debate is about the how, not the whether. Every major mental health authority that has reviewed the evidence confirms EMDR works. Reports of negative experiences, including searches like “EMDR ruined my life,” typically reflect incomplete therapy, premature session closure before processing reached resolution, or inadequate preparation phases. These outcomes reflect training failures, not inherent flaws in the method.

A trained, credentialed therapist will not begin active trauma reprocessing until clinical readiness has been fully established and the preparation phase is complete.

Who Is Not a Good Candidate for EMDR Therapy?

EMDR benefits a broad clinical population, but it is not universally appropriate for every person at every point in treatment. Some presentations require stabilization work before reprocessing can begin safely.

EMDR may not be suitable for people who:

• Are currently experiencing an active psychotic episode
• Have severe, unmanaged dissociation that has not been clinically stabilized
• Cannot tolerate brief periods of emotional activation during sessions
• Have active, severe substance use that interferes with emotional processing
• Lack a sufficient window of tolerance to stay within a manageable emotional range

People who experience functional freeze or significant emotional numbing may need dedicated stabilization work before the reprocessing phases begin. Our licensed EMDR therapist at Still Mind conducts a full clinical assessment before any active trauma processing starts.

Frequently Asked Questions

What is EMDR and how does it work?

EMDR stands for Eye Movement Desensitization and Reprocessing. It is a structured eight-phase psychotherapy that uses bilateral stimulation, most often guided eye movements, to help the brain reprocess traumatic memories. You hold a distressing memory in mind while following your therapist’s movements. Over repeated sets, the memory’s emotional charge reduces until it no longer triggers a survival stress response.

Who is not a good candidate for EMDR therapy?

People in an active psychotic episode, those with severe unmanaged dissociation, and individuals whose substance use significantly impairs emotional regulation may not be appropriate candidates. Anyone who cannot safely tolerate brief periods of emotional activation in a clinical setting may also need preparatory stabilization work first. A licensed EMDR therapist completes a clinical readiness assessment before any trauma reprocessing begins.

What are the 8 phases of EMDR?

The eight phases are history taking, preparation, assessment, desensitization, installation, body scan, closure, and reevaluation. History taking and preparation occur in the earliest sessions to build safety and identify memory targets. Phases three through eight repeat across multiple sessions until each targeted memory is fully processed and distress has resolved.

Can I do EMDR myself?

Self-administered EMDR is not recommended by EMDRIA or licensed clinicians. The protocol requires clinical judgment to select targets, monitor emotional activation, and ensure safe session closure. Bilateral stimulation apps exist but do not replicate the clinical process and carry a real risk of incomplete processing, which can intensify distress rather than reduce it.

Is EMDR therapy legit?

Yes. EMDR is recognized as an evidence-based, first-line treatment for PTSD by the World Health Organization, the American Psychiatric Association, the U.S. Department of Veterans Affairs, and the UK’s National Institute for Health and Care Excellence. It is supported by more than 30 published randomized controlled trials and decades of clinical use in over 130 countries.

References

1. Shapiro, F. (2018). Eye movement desensitization and reprocessing (EMDR) therapy: Basic principles, protocols, and procedures (3rd ed.). Guilford Press.
2. Van der Kolk, B. A., Spinazzola, J., Blaustein, M. E., Hopper, J. W., Hopper, E. K., Korn, D. L., & Simpson, W. B. (2007). A randomized clinical trial of eye movement desensitization and reprocessing (EMDR), fluoxetine, and pill placebo in the treatment of posttraumatic stress disorder. Journal of Clinical Psychiatry, 68(1), 37-46.
3. de Jongh, A., & Bicanic, I. (2024). State of the science: Eye movement desensitization and reprocessing (EMDR) therapy. Journal of Traumatic Stress. https://doi.org/10.1002/jts.23012
4. World Health Organization. (2013). Guidelines for the management of conditions specifically related to stress. WHO Press.
5. U.S. Department of Veterans Affairs. (2023). VA/DoD clinical practice guideline for PTSD. https://www.healthquality.va.gov/guidelines/MH/ptsd/
6. EMDR International Association. (2024). About EMDR therapy. EMDRIA. https://www.emdria.org/about-emdr-therapy/
7. Maxfield, L. (2019). EMDR therapy and its application. Journal of EMDR Practice and Research, 13(4), 245-261.
8. Mavranezouli, I., Megnin-Viggars, O., Daly, C., Dias, S., Welton, N. J., Heggie, R., & Pilling, S. (2020). Psychological treatments for post-traumatic stress disorder in adults: A network meta-analysis. Psychological Medicine, 50(4), 542-555.