EMD, or Eye Movement Desensitization, is the original name for what is now known as EMDR therapy (Eye Movement Desensitization and Reprocessing). Psychologist Francine Shapiro developed the initial EMD procedure in 1989 as a treatment for traumatic memories. She later expanded and renamed it EMDR after recognizing that the therapy did more than just reduce distress. It actively helped the brain reprocess and reorganize how traumatic memories were stored. Today, when people refer to EMD therapy, they almost always mean EMDR.
How EMD Became EMDR
Shapiro originally named her technique Eye Movement Desensitization because she believed it worked through a mechanism similar to systematic desensitization, a well-known behavioral therapy technique. The idea was that guided eye movements helped neutralize the emotional charge of a traumatic memory, much like exposure therapy gradually reduces a fear response.
As she refined the approach, Shapiro noticed something important: patients weren’t just becoming less distressed. They were spontaneously developing new insights, shifting how they understood past events, and forming more adaptive beliefs about themselves. This went well beyond simple desensitization. In 1991, she published a paper describing the shift from a desensitization model to an information-processing model and formally renamed the procedure Eye Movement Desensitization and Reprocessing. The name change reflected a fundamentally different understanding of what the therapy actually does in the brain.
How EMDR Works
EMDR is built on the idea that traumatic or highly distressing experiences can get “stuck” in the brain, stored in a raw, unprocessed form that keeps triggering intense emotional and physical reactions. Normally, your brain processes daily experiences during sleep and rest, filing them away as ordinary memories. Trauma can disrupt that process, leaving memories that feel as vivid and threatening as the moment they happened.
During EMDR, a therapist guides you to briefly focus on a distressing memory while simultaneously experiencing bilateral stimulation, a sensory input that alternates between the left and right sides of your body. The most common form is following the therapist’s finger or a light bar with your eyes as it moves back and forth. Other options include holding small vibrating devices that pulse in alternating hands (tactile stimulation) or listening to tones that alternate between your left and right ears.
This bilateral stimulation appears to help the brain “unstick” the memory, allowing it to be reprocessed and stored the way a normal memory would be. The result is that you can still recall what happened, but the memory no longer triggers the same flood of distress, panic, or physical tension. New associations form naturally during the process: insights emerge, the emotional intensity drops, and the memory starts to feel like something that happened in the past rather than something happening right now.
The Eight Phases of Treatment
EMDR follows a structured eight-phase protocol. These phases aren’t equal in length. Some take a full session or more, while others happen within minutes during a single appointment.
- Phase 1: History taking. Your therapist gathers information about your past, identifies the specific memories or experiences causing problems, and determines whether EMDR is a good fit.
- Phase 2: Preparation. You learn what to expect during reprocessing and practice techniques for managing emotional distress between sessions. Some people need just one preparation session; others need several.
- Phase 3: Assessment. You and your therapist identify a specific target memory and measure how it currently affects you, including the images, negative beliefs, emotions, and physical sensations connected to it.
- Phases 4 through 6: Reprocessing. This is the core of the therapy. During desensitization (phase 4), you focus on the target memory while experiencing bilateral stimulation. The goal is to reduce the emotional charge until the memory no longer feels disturbing. In installation (phase 5), a positive belief is strengthened to replace the negative one linked to the memory. Phase 6 involves a body scan to check whether any physical tension remains.
- Phase 7: Closure. Each session ends with stabilization, ensuring you leave in a manageable emotional state whether or not the memory has been fully reprocessed.
- Phase 8: Reevaluation. At the start of the next session, your therapist checks whether the improvements held and decides if additional targets need attention.
What EMDR Treats
EMDR was originally developed for post-traumatic stress disorder, and that remains its strongest evidence base. The results for PTSD are striking: research from Kaiser Permanente found that 100% of single-trauma victims and 77% of people with multiple traumas no longer met the criteria for PTSD after an average of six 50-minute sessions. Other studies have reported that 84% to 90% of single-trauma victims were free of PTSD after just three 90-minute sessions.
The therapy has since been applied to a wide range of conditions beyond PTSD. A systematic review in Frontiers in Psychology found positive effects for anxiety disorders, panic disorder, phobias, obsessive-compulsive disorder, mood disorders, chronic pain, eating disorders, addiction, sleep problems, and performance anxiety. For panic disorder specifically, studies have reported considerable decreases in panic attack frequency, general anxiety, and fear of future attacks. Phobia treatment has shown particularly fast results, with case studies documenting remission of phobic behavior in as few as four sessions, with improvements holding at follow-up.
A meta-analysis covering 17 trials and 647 patients confirmed that EMDR is effective at reducing anxiety, panic, phobia, and behavioral and somatic symptoms. One comparison found that EMDR produced similar results to cognitive behavioral therapy but with faster progress in the EMDR group.
What a Typical Course of Treatment Looks Like
A standard EMDR session lasts 50 to 90 minutes. For a single traumatic event, many people see significant improvement within three to six sessions. Complex trauma, meaning multiple traumatic experiences over a long period, typically requires more sessions. The history-taking and preparation phases alone may take several appointments before any reprocessing begins, depending on your comfort level and the complexity of your history.
During reprocessing sessions, you stay awake and aware the entire time. You’re not hypnotized, and you remain in control of the process. Your therapist will periodically pause to check in, ask what you’re noticing, and guide the next set of bilateral stimulation. The experience varies widely from person to person. Some people notice rapid shifts in emotion or sudden insights. Others experience a more gradual change over multiple sessions.
Side Effects and What to Expect
EMDR is generally well tolerated. When side effects occur, they tend to be mild and temporary. The most common experience is heightened emotional sensitivity in the hours or days following a reprocessing session. You may feel more tired than usual, have vivid dreams, or notice that emotions related to the targeted memory surface between sessions. This is typically a sign that processing is continuing outside the therapy room.
Some researchers have raised theoretical concerns about memory blurring or the creation of false memories, but recent evidence suggests these effects are not clinically significant. The structured protocol, particularly the preparation and closure phases, is specifically designed to keep you stable throughout treatment.
Finding a Qualified Therapist
EMDR requires specialized training beyond a standard therapy license. The EMDR International Association (EMDRIA) distinguishes between two levels. An “EMDR Trained Clinician” has completed a basic training program of at least 50 hours, which includes lecture, hands-on practice, and consultation. This qualifies them to use the therapy with clients. Full EMDRIA certification requires additional supervised experience and a separate application process. When looking for a provider, confirming at least one of these credentials ensures your therapist has formal training in the full eight-phase protocol rather than a surface-level familiarity with eye movements alone.