How Does EMDR Therapy Work? A Complete Guide From a Therapist’s Perspective
If someone told you that following a therapist’s fingers with your eyes could help you heal from trauma, you’d probably be skeptical. We get it. EMDR therapy (Eye Movement Desensitization and Reprocessing) sounds unusual—until you understand the neuroscience behind it.
EMDR is one of the most extensively researched and widely endorsed treatments for trauma and PTSD in the world. The World Health Organization, the American Psychological Association, and the Department of Veterans Affairs all recommend it as a front-line treatment. More than 30 randomized controlled trials support its effectiveness, and millions of people worldwide have experienced its benefits firsthand.
But how does it actually work? What happens in your brain during EMDR? And what should you expect if you decide to try it?
In this guide, we’ll walk you through everything—from the neuroscience to the eight phases of treatment to what a real session feels like—so you can make an informed decision about whether EMDR is right for you.
If you’ve ever experienced something that seemed to stick in your mind, EMDR may be just the thing to help.
What Is EMDR Therapy?
EMDR stands for Eye Movement Desensitization and Reprocessing. It was developed in 1987 by psychologist Dr. Francine Shapiro, who observed that certain types of eye movements appeared to reduce the emotional intensity of disturbing thoughts.
Since that initial observation, EMDR has been refined into a structured, eight-phase psychotherapy approach that helps people process traumatic memories and other distressing life experiences. Unlike traditional talk therapy, EMDR doesn’t rely primarily on conversation to create change. Instead, it works directly with how your brain stores and retrieves memories.
At its core, EMDR uses bilateral stimulation—rhythmic left-right stimulation of the brain, typically through guided eye movements—to help your brain’s natural information processing system “unstick” memories that have been stored in a raw, unprocessed state. The result is that traumatic memories lose their emotional charge and become integrated into your normal memory network.
How Your Brain Stores Traumatic Memories
To understand how EMDR works, you first need to understand what happens to your brain during a traumatic or highly distressing event.
Under normal circumstances, your brain processes daily experiences through a system called the Adaptive Information Processing (AIP) network. Throughout the day and during REM sleep, your brain sorts through events, integrates useful information, and discards what it doesn’t need. This is why most memories naturally fade in emotional intensity over time—your brain has successfully processed them.
But when something overwhelming happens—whether it’s a car accident, abuse, a sudden loss, combat, a frightening medical procedure, or even a deeply humiliating experience—your brain’s processing system can become overloaded. The amygdala (your brain’s alarm center) goes into overdrive, flooding your system with stress hormones, while the prefrontal cortex (the rational, thinking part of your brain) goes partially offline.
The result: the memory doesn’t get properly processed. Instead of being filed away as a past event, it gets stored in a fragmented, sensory-rich format—complete with the original emotions, physical sensations, sounds, smells, and beliefs you had at the time.
This is why trauma memories feel different from normal memories. When triggered, they don’t feel like something that happened in the past. They feel like they’re happening right now. Your heart races. Your muscles tense. You feel the same fear, shame, or helplessness you felt during the original event. Your brain is essentially replaying a memory that was never properly filed away.
EMDR is one of the most extensively researched and widely endorsed treatments for trauma and PTSD in the world.
The Neuroscience Behind EMDR: Why Bilateral Stimulation Works
The defining feature of EMDR is bilateral stimulation (BLS)—rhythmic, alternating stimulation of both sides of the brain. This is most commonly done through guided eye movements (following the therapist’s fingers or a light bar), but it can also involve alternating tapping on the knees or hands, or auditory tones that alternate between ears.
Researchers believe bilateral stimulation works through several mechanisms:
1. Mimicking REM Sleep
The eye movements used in EMDR closely resemble the rapid eye movements that occur during REM (Rapid Eye Movement) sleep—the phase of sleep when your brain naturally processes the day’s experiences. Research suggests that EMDR’s bilateral stimulation activates the same neural pathways used during REM sleep, essentially jumpstarting your brain’s natural memory processing system while you’re awake.
2. Reducing Working Memory Load
One well-supported theory is the “working memory hypothesis.” When you hold a disturbing memory in mind while simultaneously performing a bilateral task (like following moving fingers), you’re taxing your working memory. Your brain can’t fully maintain the vivid, emotional version of the memory while also tracking the eye movements. The memory becomes less vivid and less emotionally charged—and importantly, when your brain re-stores the memory after processing, it saves this less distressing version.
3. Activating Both Brain Hemispheres
Bilateral stimulation appears to enhance communication between the brain’s two hemispheres. The left hemisphere (more associated with language, logic, and linear thinking) and the right hemisphere (more associated with emotions, images, and body sensations) become better connected. This allows the traumatic memory—often stored primarily as sensory and emotional fragments in the right hemisphere—to be integrated with the left hemisphere’s capacity for language, context, and rational understanding.
4. Shifting the Nervous System
EMDR appears to help shift the autonomic nervous system from a state of sympathetic activation (fight-flight-freeze) to parasympathetic regulation (rest-and-digest). This is why many clients report feeling a physical sense of relief—relaxed shoulders, slower breathing, a release of tension—as processing unfolds.
The 8 Phases of EMDR Therapy
EMDR isn’t just eye movements. It’s a comprehensive, structured treatment protocol with eight distinct phases. Here’s what each phase involves:
Phase 1: History Taking and Treatment Planning
Your therapist takes a thorough history and works with you to identify the specific memories, triggers, and current symptoms you want to address. You’ll create a treatment plan that maps out which memories to target and in what order. This phase typically takes 1–2 sessions.
Important: You don’t need to share every detail of your trauma. Your therapist needs enough information to understand the landscape, not a blow-by-blow account.
Phase 2: Preparation
Before any processing begins, your therapist ensures you have the coping skills and resources to manage emotional distress—both during sessions and between them. This typically includes:
• Grounding techniques (5-4-3-2-1 sensory exercise, body scans)
• The “safe place” or “calm place” visualization—a mental resource you can access anytime
• Container exercise—a mental technique for “putting away” distressing material between sessions
• Somatic awareness skills—noticing where you feel emotions in your body
The preparation phase also builds the therapeutic relationship. You need to feel safe with your therapist for EMDR to work effectively. If you don’t feel ready, a good therapist will spend more time here before moving forward.
Phase 3: Assessment
For each target memory, your therapist will help you identify several components:
• The image: The most disturbing visual element of the memory
• The negative cognition: The negative belief about yourself connected to the memory (e.g., “I’m not safe,” “It was my fault,” “I’m powerless”)
• The positive cognition: The belief you’d like to hold instead (e.g., “I am safe now,” “I did the best I could,” “I have choices”)
• The emotion: What emotion comes up when you think about the memory
• The SUD: Subjective Units of Disturbance—a 0–10 scale rating of how disturbing the memory feels right now
• The body sensation: Where you feel the disturbance in your body
Phase 4: Desensitization
This is where the bilateral stimulation begins. You hold the target memory in mind—along with the negative belief and body sensation—while your therapist guides you through sets of eye movements (typically 20–30 seconds per set).
Between each set, your therapist will ask, “What do you notice?” You briefly share whatever came up—new images, thoughts, emotions, body sensations, or even seemingly random associations. Your therapist then says, “Go with that,” and begins another set.
This process continues until the SUD score drops to 0 or 1—meaning the memory no longer causes significant distress. For many clients, this shift happens within a single session for a single memory. More complex memories may take 2–3 sessions.
Phase 5: Installation
Once the memory’s distress level is minimal, your therapist helps “install” the positive cognition. You pair the processed memory with the positive belief (“I am safe now”) and continue bilateral stimulation until the positive belief feels fully true—typically rated 6 or 7 on a 1–7 Validity of Cognition (VoC) scale.
Phase 6: Body Scan
You bring the memory and positive belief to mind while scanning your body for any remaining tension, tightness, or discomfort. If residual body sensations are found, your therapist targets them with additional bilateral stimulation until they clear. This step is important because trauma lives in the body, not just the mind.
Phase 7: Closure
Your therapist ensures you’re in a stable, calm state before ending the session—regardless of whether the memory was fully processed. If processing is incomplete, the therapist guides you through a calming exercise (like the safe place visualization) and explains that processing may continue between sessions.
Phase 8: Reevaluation
At the start of each subsequent session, your therapist checks in on previously processed memories. Has the positive change held? Have new memories or issues surfaced? This phase ensures that gains are maintained and guides the ongoing treatment plan.
What Does an EMDR Session Actually Feel Like?
This is one of the most common questions we get, and it’s hard to answer definitively because everyone’s experience is different. But here’s what clients at Tangible Therapy typically describe:
During processing, you might notice the memory shifting—like watching it from further away, or seeing it from a different angle. Emotions may intensify briefly before releasing. You might experience waves of sadness, anger, or relief. Some clients notice physical sensations: tingling, warmth, tightness releasing, stomach settling.
Between sets, associations may flow quickly—jumping from the target memory to other related memories, to random images, to insights you’ve never had before. This is your brain making connections and doing the work of integration.
Many clients describe the overall experience as “watching a movie of my life” or “like the memory is on a train and I’m watching it pass by.” After processing, the most common response is: “It just feels like something that happened. It’s not gone—I remember it—but it doesn’t hurt anymore.”
You remain fully conscious, alert, and in control the entire time. You can stop at any point. EMDR is not hypnosis, and you are never in a suggestible or altered state.
Many clients describe the overall experience as “watching a movie of my life” or “like the memory is on a train and I’m watching it pass by.” After processing, the most common response is: “It just feels like something that happened. It’s not gone—I remember it—but it doesn’t hurt anymore.”
What Conditions Does EMDR Treat?
EMDR was originally developed for PTSD, but research and clinical practice have expanded its applications significantly. Current evidence supports EMDR for:
• Post-Traumatic Stress Disorder (PTSD) — single-incident trauma, complex trauma, childhood trauma, combat-related PTSD
• Anxiety disorders — generalized anxiety, social anxiety, panic disorder, health anxiety
• Depression — particularly when rooted in adverse life experiences or deeply held negative self-beliefs
• OCD and related disorders — emerging evidence supports EMDR as a complementary treatment
• Phobias and specific fears
• Grief and complicated bereavement
• Performance anxiety (sports, academic, professional)
• Chronic pain with a psychological component
• Attachment injuries and relationship patterns
• Disturbing experiences that affect couples and relationships
You don’t need a PTSD diagnosis to benefit from EMDR. If an experience from your past is still driving your emotions, behaviors, or beliefs about yourself, EMDR can likely help.
How Does EMDR Compare to Other Trauma Therapies?
If you’re exploring therapy options, you may be wondering how EMDR stacks up against other evidence-based treatments. Here’s a comparison of the most commonly used trauma therapies:
EMDR vs. Cognitive Behavioral Therapy (CBT)
CBT focuses on identifying and changing unhelpful thought patterns through structured conversation and homework assignments. It’s highly effective for many conditions but requires significant between-session work (thought records, behavioral experiments, exposure exercises).
EMDR works more directly with how memories are stored in the brain, requiring less conscious cognitive effort and typically less homework. Some clients who have struggled with CBT’s structured approach find EMDR more intuitive and less exhausting.
EMDR vs. Prolonged Exposure (PE)
Prolonged exposure therapy requires you to repeatedly recount your traumatic experience in detail, both in session and as homework (listening to recordings of your trauma narrative). While effective, dropout rates are higher than EMDR, likely because the repeated retelling can be extremely difficult.
EMDR doesn’t require detailed verbal retelling. You hold the memory in mind during bilateral stimulation, but you don’t need to narrate it. Many clients find this more tolerable.
EMDR vs. Somatic Experiencing
Somatic Experiencing (SE) focuses on releasing trauma stored in the body through awareness of physical sensations. EMDR also addresses the body—the body scan is a core phase—but takes a broader approach that includes cognitive, emotional, and sensory elements. The two approaches can complement each other well.
What Does the Research Say About EMDR?
EMDR is one of the most extensively studied psychotherapy treatments in history. Here are some key findings:
• A meta-analysis published in the Journal of Clinical Psychology found that 84–90% of single-trauma victims no longer met criteria for PTSD after just three 90-minute EMDR sessions.
• The World Health Organization (2013) recommends EMDR and CBT as the only psychotherapies for children, adolescents, and adults with PTSD.
• A 2014 meta-analysis in the Journal of EMDR Research and Practice found that EMDR required fewer sessions than trauma-focused CBT to achieve comparable outcomes.
• A 2020 meta-analysis confirmed EMDR’s effectiveness for depression, with significant symptom reduction maintained at follow-up.
• The American Psychological Association (2017) conditionally recommends EMDR for adult PTSD treatment.
• A 2024 systematic review in Frontiers in Psychology found strong evidence for EMDR’s effectiveness across anxiety disorders, not just PTSD.
The evidence is clear: EMDR works, and it works for a broad range of conditions beyond its original application for PTSD.
Common Myths About EMDR
Myth: EMDR Is Just Waving Fingers
Eye movements are the most visible part of EMDR, but they’re only one element of a comprehensive eight-phase protocol. The preparation, assessment, installation, body scan, and reevaluation phases are all essential to the treatment’s effectiveness.
Myth: EMDR Is Hypnosis
EMDR and hypnosis are fundamentally different. During EMDR, you are fully conscious, oriented, and in control. There is no suggestion, trance state, or altered consciousness involved. You can stop the process at any time.
Myth: EMDR Erases Memories
EMDR doesn’t erase or remove memories. It changes how memories are stored so they no longer carry the same emotional charge. After processing, you’ll still remember the event—it’s just that remembering it won’t trigger the same distress.
Myth: You Need to Have “Serious” Trauma for EMDR
EMDR can help with any experience that continues to cause distress—whether it’s combat trauma, childhood neglect, a difficult breakup, a car accident, or a humiliating experience at school. If it still bothers you, it’s worth processing.
Myth: EMDR Is Too Good to Be True
We understand the skepticism. The mechanism can sound simplistic. But the research is robust—decades of randomized controlled trials, endorsements from every major health organization, and millions of successful outcomes worldwide. The speed at which EMDR can produce results can feel surprising, but it reflects the efficiency of working directly with your brain’s natural processing system.
EMDR Therapy at Tangible Therapy in Utah
At Tangible Therapy, our EMDR-trained clinicians work with clients at our offices in Provo, Orem, and Sandy, Utah, as well as via telehealth throughout the state.
We believe in making EMDR accessible, warm, and collaborative. There’s no pressure to move faster than you’re ready, no judgment about the experiences you bring in, and no one-size-fits-all approach. Every treatment plan is tailored to your unique history, goals, and nervous system.
If you’re curious about whether EMDR could help with what you’ve been carrying, we’d love to talk. You can reach us at 435-260-5406 or book a free consultation through our website.
Frequently Asked Questions About EMDR
How does EMDR work in the brain?
EMDR uses bilateral stimulation (typically guided eye movements) to activate your brain’s natural information processing system. This is believed to work similarly to REM sleep, allowing stuck traumatic memories to be reprocessed and integrated into your normal memory network. The bilateral stimulation reduces the emotional intensity of the memory while strengthening connections between the brain’s emotional and rational processing centers.
How many EMDR sessions do I need?
For a single traumatic event, many people see significant improvement in 3–6 sessions. Complex trauma—multiple events, childhood trauma, or prolonged adverse experiences—may require 12–20 or more sessions. Your therapist will give you a realistic estimate during the treatment planning phase, and you’ll track progress together throughout.
Does EMDR work for anxiety?
Yes. Research supports EMDR for anxiety disorders including generalized anxiety, social anxiety, panic disorder, and specific phobias—especially when the anxiety is connected to specific distressing experiences or deeply held negative beliefs about yourself or the world. A 2024 systematic review confirmed strong evidence for EMDR across anxiety disorders.
Is EMDR safe?
Yes. EMDR is recognized as a safe treatment by the World Health Organization, the American Psychological Association, and other major health bodies. Side effects are minimal and typically limited to temporary emotional sensitivity between sessions as your brain continues processing. Your therapist will prepare you with coping tools during the preparation phase.
Can EMDR be done online?
Yes. EMDR can be effectively delivered via telehealth using virtual bilateral stimulation methods such as on-screen moving dots, self-administered tapping (butterfly hug), or audio-based tones. At Tangible Therapy, we offer EMDR via telehealth to clients anywhere in Utah.
What does EMDR feel like?
Clients describe a range of experiences. During processing, you may notice emotions intensifying briefly before releasing, physical sensations shifting, and the memory becoming less vivid or further away. Between sets, thoughts and associations may flow quickly. After processing, most people describe the memory as “just something that happened”—present but no longer painful. You remain fully conscious and in control throughout.
How is EMDR different from talk therapy?
Traditional talk therapy processes difficult experiences primarily through conversation—analyzing thoughts, developing new perspectives, and practicing coping strategies. EMDR works more directly with how memories are stored in the brain, using bilateral stimulation to help your brain’s natural processing system resolve stuck memories. EMDR typically requires less between-session homework and doesn’t require detailed verbal retelling of traumatic events.
Can EMDR help with childhood trauma?
Yes. EMDR is highly effective for childhood trauma, including abuse, neglect, family dysfunction, and attachment injuries. Childhood memories are often stored differently than adult memories—more as sensory fragments and body sensations than coherent narratives—and EMDR is specifically designed to access and process memories in whatever form they’re stored.
Does EMDR work for depression?
Research supports EMDR for depression, especially when depression is rooted in adverse life experiences or negative core beliefs like “I’m not good enough” or “I’m unlovable.” A 2020 meta-analysis found that EMDR significantly reduced depressive symptoms with effects maintained over time. It can be used alone or alongside other treatments.
How long does an EMDR session last?
EMDR sessions typically last 50–90 minutes. Some therapists offer extended sessions (90–120 minutes) for processing phases, which allows more time for complete memory processing within a single session. Your therapist will discuss session length options with you.
