What is EMDR Therapy?
Eye Movement Desensitization and Reprocessing (EMDR) therapy is a structured psychotherapeutic approach designed to help individuals process and integrate traumatic memories. Developed by Francine Shapiro in 1987, it involves recalling traumatic memories while engaging in bilateral stimulation—most commonly side-to-side eye movements, but also alternating sounds or tactile tapping. The method is grounded in the Adaptive Information Processing (AIP) model, which proposes that trauma arises when distressing experiences are stored in fragmented, unprocessed forms in memory networks, maintaining their original emotional intensity and maladaptive beliefs.
EMDR is an evidence-based psychotherapy for post-traumatic stress disorder (PTSD) and is recommended by the World Health Organization, American Psychiatric Association, and U.S. Departments of Defense and Veterans Affairs. While originally developed for trauma, it has been applied to anxiety disorders, depression, phobias, grief, and other conditions with traumatic components.
Origins & Lineage
In 1987, psychologist Francine Shapiro observed while walking in a park that moving her eyes from side to side appeared to reduce the disturbance of negative thoughts and memories. After studying this effect further, she published her success in using EMDR as a treatment in 1989 in the Journal of Traumatic Stress. The method was initially called Eye Movement Desensitization (EMD), but as Shapiro incorporated additional therapeutic components—including cognitive restructuring, dual attention, and an eight-phase protocol—it evolved into a comprehensive psychotherapy approach and was renamed EMDR.
Shapiro, who held a PhD in psychology from New York University, founded the EMDR Institute in Watsonville, California, and served as senior research fellow emeritus at the Mental Research Institute in Palo Alto. By 1990, prominent figures including trauma researcher Charles Figley and behavior therapist Joseph Wolpe became interested in EMD and sought training. Wolpe subsequently published research on EMDR’s application to PTSD in the Journal of Behavior Therapy and Experimental Psychiatry, lending early academic credibility. Shapiro continued to refine the method until her death in 2019, authoring multiple editions of the definitive textbook Eye Movement Desensitization and Reprocessing: Basic Principles, Protocols, and Procedures and training thousands of clinicians worldwide.
The origins of EMDR have been debated. While Shapiro reported the therapeutic use of eye movements as a serendipitous discovery during her park walk, some researchers have noted that individuals cannot typically perceive their own eye movements and have pointed to Shapiro’s prior exposure to Neuro-Linguistic Programming (NLP) theory, which explored eye movement patterns in the 1980s. Regardless of its precise genesis, EMDR has since been subjected to extensive empirical testing separate from its origin narrative.
How It’s Practiced
EMDR therapy follows an eight-phase protocol: history-taking, preparation, assessment, desensitization, installation, body scan, closure, and reevaluation. The distinctive element occurs during the desensitization phase, when the client recalls a target memory—a specific image, negative belief, emotion, and body sensation—while simultaneously tracking the therapist’s fingers moving horizontally across the visual field (or following a light bar, listening to alternating tones through headphones, or experiencing alternating tactile taps on the hands or knees).
Sets of bilateral stimulation typically last 20-30 seconds. After each set, the client briefly reports what emerged—new images, thoughts, emotions, or sensations. The therapist then instructs the client to “notice that” and initiates another set of bilateral stimulation. This process continues until the memory loses its emotional charge, measured by the Subjective Units of Disturbance (SUD) scale dropping to zero or near-zero. The installation phase then strengthens a positive cognition (e.g., “I did the best I could”) to replace the original negative belief.
The effectiveness of EMDR contrasts with limited knowledge of its underlying mechanism of action, and the role of bilateral stimulation as an active component has been a subject of controversy. Proposed mechanisms include working memory taxation, interhemispheric communication, orienting responses, and broader neurobiological processes related to memory reconsolidation. The working memory hypothesis—currently the most empirically supported—suggests that recalling a distressing memory while performing a concurrent task (bilateral stimulation) taxes the limited capacity of working memory, reducing the vividness and emotional intensity of the memory. Another prominent theory is that bilateral stimulation mimics the biological process that occurs during REM sleep, when eyes move back and forth as the brain processes and consolidates memories.
EMDR Therapy Today
EMDR is now practiced globally by tens of thousands of trained clinicians. It is offered in private practice, hospital settings, community mental health centers, and through humanitarian organizations. The EMDR Humanitarian Assistance Programs (EMDR-HAP), founded by Shapiro, has provided pro bono training and disaster response in contexts including the 2004 Indian Ocean tsunami, Hurricane Katrina, the Boston Marathon bombing, and the Philippine typhoon of 2013.
Individuals seeking EMDR typically work with a licensed therapist certified in the method through organizations such as the EMDR International Association (EMDRIA) or the EMDR Institute. Sessions usually occur weekly, with trauma processing beginning only after establishing safety, resources, and stabilization. Treatment length varies—some single-incident traumas may resolve in a few sessions, while complex trauma or attachment wounds often require months or longer.
While EMDR was designed as a therapist-guided intervention, Shapiro co-authored Getting Past Your Past: Take Control of Your Life with Self-Help Techniques from EMDR Therapy to introduce the AIP model and some self-administered techniques to the general public. However, bilateral stimulation for trauma reprocessing is not recommended as a self-directed practice without professional guidance, particularly for individuals with dissociative symptoms, uncontrolled substance use, or unstable life circumstances.
Common Misconceptions
EMDR is not hypnosis. Clients remain fully conscious and in control throughout, and the therapist does not implant suggestions. The bilateral stimulation is not intended to induce a trance state, but rather to facilitate the client’s own information processing.
EMDR is not “just eye movements.” The bilateral stimulation is one component within a comprehensive, phased therapy that includes careful assessment, preparation, cognitive interweaves when processing stalls, and installation of adaptive beliefs. Research indicates that EMDR delivered without fidelity to the full protocol is less effective.
EMDR does not erase memories. Processed memories remain accessible, but lose their distressing somatic and emotional charge. Clients often report that traumatic events feel like “something that happened” rather than “something happening now.”
The efficacy of bilateral stimulation itself remains debated. Lab and clinical research find that the modality of bilateral stimulation matters less than the dual-attention task itself—eye movements, alternating taps, and alternating tones show similar effects on memory vividness. Some researchers argue that exposure and cognitive processing account for EMDR’s effectiveness, with bilateral stimulation playing a minimal or placebo role. The mechanism question is a separate research question from the efficacy question—efficacy is settled even where mechanism is still being refined.
How to Begin
If you are considering EMDR therapy, begin by locating a licensed mental health professional trained in EMDR through the EMDRIA therapist directory (emdria.org) or the EMDR Institute (emdr.com). Verify that the clinician has completed an EMDRIA-approved training program and ideally has pursued consultation or certification.
Prior to engaging with bilateral stimulation for trauma processing, read Francine Shapiro’s Getting Past Your Past to understand the Adaptive Information Processing model and assess whether EMDR aligns with your healing goals. The book includes self-assessment tools and exercises for emotional regulation that can be practiced independently.
EMDR is not the sole path for trauma healing. It exists alongside somatic therapies (Somatic Experiencing, Sensorimotor Psychotherapy), cognitive-behavioral approaches (Prolonged Exposure, Cognitive Processing Therapy), and body-based practices. Some individuals integrate EMDR with other modalities; others find different methods more resonant. Trust your discernment, seek practitioners who honor your autonomy, and remember that all effective trauma therapy requires safety, pacing, and relational attunement.