How EMDR Therapy Works: The 8 Phases Explained

The 8 phases of EMDR therapy provide a structured path from understanding your history and preparing safely to processing a target memory, strengthening a more helpful belief, and reviewing progress. EMDR stands for Eye Movement Desensitization and Reprocessing, and the phases may unfold over several sessions rather than all at once.

KEY TAKEAWAYS

• EMDR has eight phases: history and treatment planning, preparation, assessment, desensitization, installation, body scan, closure, and reevaluation.

• A phase is part of the treatment process, not a promise that each phase will take one session. The pace depends on your needs, history, stability, and treatment goals.

• Bilateral stimulation may involve guided eye movements, alternating taps, or sounds while you briefly attend to a target memory. The exact mechanism is still under study.

• EMDR does not usually require a detailed verbal retelling of every event, but the therapist still needs enough information to assess safety, select targets, and guide treatment.

• Evidence is strongest for post-traumatic stress disorder. A trained therapist should assess whether EMDR is appropriate for your symptoms and circumstances.

What Are the 8 Phases of EMDR Therapy?

The 8 phases of EMDR therapy are a clinical framework that helps a trained therapist plan, prepare, process, and review treatment in an organized way. They are not eight identical appointments, and therapists may move back and forth between phases as new information appears or your needs change.

EMDR was developed in the late 1980s by psychologist Francine Shapiro to address distress associated with traumatic memories. Current evidence and treatment guidelines most clearly support EMDR for post-traumatic stress disorder, often called PTSD. Clinicians may also consider it for other difficulties when distressing memories, triggers, or learned fear responses are central, though the evidence and fit vary by concern.

A broader overview is available on our EMDR therapy in Calgary page. This guide stays focused on the phase-by-phase experience so you can understand what each part of treatment is designed to accomplish.

How Bilateral Stimulation Fits Into the 8 Phases of EMDR Therapy

Bilateral stimulation is used primarily during the processing phases of EMDR, when you briefly focus on a target memory and attend to alternating left-right input. The therapist may guide your eyes from side to side, use alternating taps, or provide alternating sounds, depending on the treatment setting and what feels workable for you.

Experimental research, particularly on eye movements and other dual-task procedures, has found reductions in the vividness and emotional intensity of recalled distressing memories. Evidence is less developed for other forms of bilateral stimulation, and researchers continue to debate which components drive clinical outcomes. Working-memory taxation and new learning are among the proposed explanations, but no single mechanism has been established.

EMDR does not involve hypnosis. You remain conscious during bilateral stimulation and can ask to pause or stop. The therapist checks in regularly and adjusts the pace based on what you report and what they observe. You do not need to force an insight or make the memory disappear. The goal is to allow new information, feelings, images, or body sensations to emerge without turning the process into an endurance test.

A phase is not the same as a session.
Some phases may require more than one session, several phases may occur in one appointment, and reevaluation can lead the therapist back to preparation or assessment. EMDR is structured yet personalized.

Phases 1 Through 4: History, Preparation, Assessment, and Desensitization

The first four phases establish the treatment plan, prepare you for the work, define a target, and begin reprocessing. The standard EMDR protocol includes assessment and preparation before target-memory reprocessing. The amount of preparation is tailored to your needs, safety, supports, and ability to manage distress.

Phase 1: History Taking and Treatment Planning

Your therapist learns what brings you to therapy, what is happening in your life now, and what you hope to change. Together, you discuss relevant history, current supports, health factors, safety concerns, and possible memories or situations that may become treatment targets.

You do not need to provide a perfect timeline or disclose every detail immediately. The therapist gathers enough information to understand patterns, assess whether EMDR is appropriate, and set the pace. Phase 1 can continue throughout treatment as new concerns or connections emerge.

Phase 2: Preparation

Preparation builds understanding, trust, and practical support before memory processing begins. Your therapist explains the EMDR process, answers questions, establishes a stop signal, and helps you practise techniques to settle your body and return your attention to the present.

Preparation may include grounding, paced breathing, imagery, orienting to the room, or identifying supportive people and routines. The amount of preparation varies. People with complex histories, current instability, dissociation, limited support, or strong fear of the process may need more time.

Phase 3: Assessment

Assessment identifies the specific target and establishes a baseline for processing. You may be asked to notice the image or moment that best represents the memory, the negative belief associated with it, a preferred positive belief, the emotions present, and where distress is felt in the body.

Therapists often use brief rating scales. Subjective Units of Disturbance (SUD) measures current distress, commonly rated from 0 to 10. Validity of Cognition (VOC) measures how true the preferred positive belief feels, commonly rated from 1 to 7. These are tracking tools rather than tests you can pass or fail.

Phase 4: Desensitization

Desensitization is the phase most people picture when they think of EMDR. You hold the target in mind briefly while completing sets of bilateral stimulation, then pause to report what you notice. The therapist follows the material that emerges and guides the next set.

The experience may shift through images, thoughts, emotions, memories, or body sensations. Distress often changes during processing, but the session does not need to end with a perfect score. The therapist monitors your level of activation and adjusts pacing with the aim of keeping the work tolerable. Processing can pause, and treatment can return to preparation whenever needed.

Phases 5 Through 8: Installation, Body Scan, Closure, and Reevaluation

The final four phases strengthen adaptive learning, check for remaining body distress, close the session safely, and review whether the work held over time. These phases help ensure that symptom change is assessed rather than assumed.

Phase 5: Installation

Installation focuses on strengthening the positive belief identified during assessment. A belief such as “I am safe now,” “I have choices,” or “I did the best I could” is paired with the processed memory and bilateral stimulation while the therapist checks how true it feels.

The positive belief should align with your experience rather than sound artificially optimistic. The goal is a belief that feels realistic, grounded, and connected to what you have learned through processing.

Phase 6: Body Scan

During the body scan, you bring the target memory and positive belief to mind while slowly noticing physical sensations from head to toe. Lingering tension, heaviness, numbness, tightness, or other discomfort may indicate that further processing is needed.

A body sensation is information, not proof that a particular memory is accurate or that trauma is the only explanation. Therapists should consider the full clinical context, and new or concerning physical symptoms still require appropriate medical assessment.

Phase 7: Closure

Closure is intended to help you reconnect with the present before the session ends, whether the target feels complete or processing will continue later. Your therapist may use grounding, breathing, imagery, movement, or a brief summary of what to expect between sessions.

You may be invited to note dreams, memories, triggers, or changes as they arise, without trying to analyze them. A clear plan for coping and contacting appropriate support is especially important after an emotionally demanding session.

Phase 8: Reevaluation

Reevaluation usually occurs at the start of a subsequent session. You and your therapist review the previously processed target, current distress, the positive belief, body sensations, and any new material that appeared after the appointment.

The review helps determine whether the target remains settled, needs further work, or connects to another memory or a future situation. Reevaluation also provides a structured opportunity to discuss side effects, concerns, changes in daily life, and whether the treatment plan still fits.

Finding an EMDR Therapist in Calgary to Begin Treatment

Finding an EMDR therapist in Calgary starts with checking training, professional regulation, fit, and how the therapist handles preparation and consent. EMDR should be delivered as a complete treatment approach, not reduced to eye movements without assessment, planning, and follow-up.

1. Ask about EMDR training and supervision. A therapist should be able to explain where they trained, how they maintain competence, and which concerns they commonly treat.

2. Ask how they determine when processing should begin. Listen for an individualized answer that covers history, safety, stability, supports, and your ability to pause or change course.

3. Discuss what you will and will not need to disclose. You can ask how much detail is required, how privacy is handled, and what happens if you become overwhelmed.

4. Clarify session length and format. Some clients use standard appointments, while others may discuss longer sessions. Virtual EMDR may be considered for some clients when the therapist has appropriate training, and the plan addresses clinical fit, privacy, technology, informed consent, emergency procedures, and professional requirements. Research on remote EMDR delivery is still emerging.

5. Use the consultation to assess the relationship. Training matters, and so does whether the therapist feels calm, transparent, collaborative, and responsive to your questions.

Tri Lotus Psychotherapy offers in-person and virtual support, depending on therapist availability and clinical fit. You can review the therapy approaches offered at Tri Lotus, read about how trauma can affect the nervous system, or meet the Tri Lotus therapy team before deciding what feels right.

Frequently Asked Questions About the 8 Phases of EMDR Therapy

Understanding the Process Can Make the First Step Feel More Manageable

The 8 phases of EMDR therapy provide a clear structure, but the work should proceed at a pace that respects your history, preferences, and current capacity. Preparation, consent, and reevaluation are as important as bilateral stimulation. You do not need to arrive with a complete story or certainty that EMDR is right for you.

Tri Lotus Psychotherapy offers a free 20-minute introductory consultation so you can ask questions, discuss what you are experiencing, and explore whether an EMDR-trained therapist may be a good fit. When you are ready, you can book a free 20-minute introductory consultation and take the next step without committing to treatment before you feel comfortable.

Land Acknowledgment: I gratefully acknowledge and honour that where I live, work and play is within the traditional territories of the people of the Treaty 7 region in Southern Alberta, which includes the Blackfoot Confederacy (comprising the Siksika, Piikani, and Kainai First Nations) as well as the Tsuut’ina First Nation, and the Stoney Nakoda (including the Chiniki, Bearspaw, and Wesley First Nations); and Métis Nation of Alberta, Region 3. The traditional Blackfoot name of this place is “Mohkinstsis”, which is also known now as Calgary.

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