How EMDR therapy works
EMDR (Eye Movement Desensitization and Reprocessing) is a structured psychotherapy that uses bilateral stimulation to help the brain reprocess traumatic or distressing memories. Developed by Francine Shapiro in 1987, it is endorsed by the World Health Organization, the VA/Department of Defense, and the American Psychological Association as a front-line treatment for trauma. Over 30 randomized controlled trials support its effectiveness.
What is bilateral stimulation?
Bilateral stimulation is a technique where alternating sensory input is delivered to both sides of the body. This can take the form of guided eye movements (following a therapist's finger or a light bar), alternating taps on the knees or hands, or auditory tones alternating between ears. The stimulation engages both hemispheres of the brain simultaneously.
The mechanism is thought to mimic what happens during REM (rapid eye movement) sleep, when the brain naturally processes and consolidates memories. During REM, the eyes move rapidly back and forth while the brain files experiences into long-term memory. EMDR's bilateral stimulation appears to activate this same process for "stuck" traumatic memories that weren't fully processed during normal sleep.
The neuroscience behind EMDR
Research using brain imaging (fMRI and PET scans) shows that EMDR produces observable changes in brain activity. Before treatment, trauma survivors show hyperactivity in the amygdala (the brain's alarm system) and reduced activity in the prefrontal cortex (responsible for rational thought and emotional regulation). After EMDR, these patterns normalize.
The leading scientific explanation is the memory reconsolidation model. When a traumatic memory is activated during bilateral stimulation, it enters a malleable state where it can be updated with new information. The memory is then re-stored without the original emotional intensity. This explains why after EMDR, clients can recall the event but no longer feel the same distress — the factual memory remains, but the emotional charge is significantly reduced.
The 8 phases of EMDR therapy
EMDR follows a structured, 8-phase protocol developed by Francine Shapiro. A typical course of treatment spans 6–12 sessions, each lasting 60–90 minutes.
- History & treatment planning — Your therapist gathers your history and identifies target memories for processing.
- Preparation — You learn coping techniques and your therapist explains the EMDR process so you feel safe.
- Assessment — You identify a specific memory, the negative belief attached to it, and the positive belief you'd prefer.
- Desensitization — While focusing on the memory, you follow bilateral stimulation (eye movements, taps, or tones) until the distress fades.
- Installation — The positive belief is strengthened and linked to the original memory.
- Body scan — You check for any remaining physical tension related to the memory.
- Closure — Your therapist ensures you leave the session feeling stable, using the coping techniques from Phase 2 if needed.
- Re-evaluation — At the next session, you revisit the target memory to confirm the processing held and identify any remaining aspects.
EMDR vs CBT: how they compare
| EMDR | CBT | |
|---|---|---|
| Approach | Reprocesses memories via bilateral stimulation | Changes thought patterns through cognitive restructuring |
| Homework | Minimal — processing happens in session | Significant — worksheets, journaling, exposure tasks |
| Detail required | No detailed trauma narrative needed | Detailed discussion of thoughts and events |
| Typical duration | 6–12 sessions for single-trauma | 12–20 sessions |
| WHO recommended | Yes (for trauma) | Yes (trauma-focused CBT) |
| Best for | Trauma, PTSD, anxiety, grief, phobias | Depression, anxiety, OCD, insomnia |
Both are effective, evidence-based treatments. Many therapists integrate elements of both depending on the client's needs.
Conditions EMDR treats
EMDR is effective for a wide range of conditions beyond PTSD. Research supports its use for:
Other conditions include phobias, chronic pain, performance anxiety, and eating disorders.
Research and endorsements
- EMDR is one of only two psychotherapies recommended for PTSD by the World Health Organization. (WHO Guidelines for PTSD, 2013)
- The VA/Department of Defense Clinical Practice Guidelines strongly recommend EMDR for PTSD treatment in military and veteran populations. (VA/DoD Clinical Practice Guidelines, 2023)
- The American Psychological Association recommends EMDR for PTSD in adults. (APA PTSD Treatment Guidelines, 2017)
- A comprehensive meta-analysis of 30+ RCTs confirmed EMDR's efficacy for trauma with large effect sizes. (Simpson et al., British Journal of Psychology, 2025)
Frequently asked questions
- How many EMDR sessions will I need?
- Most single-trauma cases resolve in 6–12 sessions. Complex trauma may require 12–24+ sessions. Your therapist will create an individualized treatment plan based on your history and goals.
- Does EMDR therapy hurt?
- EMDR is not physically painful. Some clients experience temporary emotional discomfort as distressing memories surface during processing, but this typically passes within the session. Your therapist monitors your comfort throughout.
- Can EMDR be done online via telehealth?
- Yes. EMDR can be effectively delivered via telehealth using visual bilateral stimulation (following a moving dot on screen) or self-administered tapping. Loma's platform includes built-in bilateral stimulation tools for remote sessions.
- Is EMDR therapy evidence-based?
- Yes. EMDR is supported by over 30 randomized controlled trials and is recommended by the World Health Organization, the VA/Department of Defense, and the American Psychological Association. It is one of the most extensively researched trauma treatments.
- What's the difference between EMDR and talk therapy?
- Traditional talk therapy processes experiences through verbal narrative. EMDR uses bilateral stimulation to engage the brain's own healing process. You don't need to describe traumatic events in detail during EMDR, and many clients find it faster and less re-traumatizing.
Related guides
- Insurance coverage — Does your plan cover EMDR? See accepted insurers, typical copays, and CPT codes.
- Therapist credentials — What does "EMDR trained" vs "EMDRIA certified" actually mean? What to look for.
- What is EMDR? — Complete guide to EMDR therapy — history, research, and how it compares to CBT.
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