The Neuroscience Behind EMDR: How the Brain Reprocesses Trauma

Table of Contents

• Why Understanding the Brain Matters in Trauma Therapy

• How Trauma Affects the Brain and Memory

• What Happens in the Brain During EMDR

• The Role of Bilateral Stimulation

• EMDR and Memory Reconsolidation

• EMDR Therapy in San Diego

Why Understanding the Brain Matters in Trauma Therapy

Post Traumatic Stress Disorder: Trauma isn’t just psychological, it’s a brain and body event.

Trauma isn’t just something that happens in your mind, it’s something your whole body remembers. When you go through something overwhelming or frightening, your brain and nervous system instinctively shift into survival mode to protect you. Your muscles tighten, your heart rate increases, your breathing changes and your body holds on to the sense of danger often long after the traumatic experience ends. These physical and emotional responses can linger causing you to feel anxious, disconnected, tense or hypervigilant. Many people don’t realize the lasting effects that trauma can have on the mind and body. It’s important to understand that trauma is not the event that happened, it’s our response to the event and what continues to remain active inside.

When the brain gets stuck: How trauma disrupts the brain

Post traumatic stress

The overwhelm of psychological trauma disrupts the brains, normal patterns of communication. Rather than information flowing smoothly between regions that regulate emotion, memory and body awareness, the brain gets stuck in survival mode. The fear center of the brain known as the amygdala takes over and the prefrontal cortex known for rational thinking and reasoning abilities as well as the hippocampus, which is responsible for recording and remembering such as time, date, and specific details become less active. Given the hippocampus is less active many people don’t have clear memories of details regarding traumatic events. Instead, what is recording and remembering is the amygdala, but it’s doing so at the level of our sensory experience. It is recording all the sensations on a visceral somatic and body level. This is why many people long after a traumatic event can become triggered or activated by certain things there seeing or hearing smelling or feeling, but they can’t put the finger on wide or trigger or activated. This is also why approaches that focus on thinking and cognition fall short. Cognitive behavioral therapy uses thinking and analysis to resolve issues but this is not the part of the brain that is active during traumatic events. While EMDR therapy uses the mind and body to address PTSD symptoms, anxiety disorders, negative beliefs, disturbing memories, negative emotions, anxiety symptoms, emotional distress, trauma stress, and other mental health disorders to treat traumatic memories and post traumatic stress disorder.

How EMDR Restores Neural Balance

The Science Behind EMDR

Research using brain imaging has shown that EMDR therapy helps to restore the balance of communication in the brain by reconnecting a neural pathways that were disrupted during traumatic experiences. EMDR uses bilateral stimulation, such as eye movements, or tapping, which engage both hemispheres of the brain. This has been shown to help integrate emotional and sensory memories so that they can be processed and released rather than reexperience over and over. EMDR as a trauma therapy, has also been shown to reduce hyper arousal in the amygdala what allows for better communication with the prefrontal cortex so that the brain can reconnect re-process and return to a greater sense of homeostasis.

How Trauma Affects the Brain and Memory: Why EMDR Helps the Mind and Body Heal

How is Trauma Encoded in the Brain

When we experience trauma, the brain encodes it differently than an ordinary or nontraumatic experience. In everyday situations, the hippocampus processes what we experience and organizes it based on where we are in time and space. It records the beginning, middle and ending of what is happening with as much detail as possible.  During trauma, the hippocampus and the prefrontal cortex take a back seat to let the amygdala, the brains fear center, take over to help protect and triage what’s necessary. This leads to memories being stored in a more sensory, emotional and fragmented way rather than a cohesive narrative. The brain records the felt sense experience rather than the details of what happened.

This is why trauma from the past can feel like it is happening in the present. The sensory sights, sounds, smells, or bodily sensations associated with the trauma can reactivate similar or familiar emotional or physical reactions. Even subtle reminders, a tone, scent, facial expression, a room layout that feels similar to a past trauma  can trigger feelings of threat or anxiety. This is part of trauma recovery and can feel like a loop, replaying the trauma. It is the body’s way of holding on to unresolved traumatic experiences. Traumatic memories of traumatic event (s) are often not fully integrated, leaving them to replay or loop in the unconscious getting triggered whenever a similar or familiar event occurs. This can be highly anxiety provoking, exhausting, and defeating.

EMDR Helps to Resolve Trauma Memories

EMDR Helps to Resolve Trauma Memories

EMDR therapy helps address what many people describe as incomplete memory integration, an overwhelming experience that gets stored on a sensory level of alarming sights, sounds and feelings. Bilateral stimulation during EMDR helps the brain become calmer and more flexible. Research shows that EMDR reduces hyperarousal and hypervigilance in the amygdala while strengthening and activating the prefrontal cortex and hippocampus. Through the practice of EMDR traumatic memories become less vivid and emotionally charged and more integrated. The brain becomes desensitized as traumatic memories are reprocessed trough bilateral stimulation such as eye movements, sounds or tapping. EMDR helps the brain complete and integrate what was too flooded and overwhelmed to process at the time of the trauma.  It helps to restore more balance and flow allowing the mind and body to return to stability and homeostasis.

EMDR Protocol

Through the practice of EMDR traumatic memories become less vivid and emotionally charged and more integrated. The trauma processing during EMDR treatment reduces trauma symptoms, decreases emotional intensity, The brain becomes desensitized as traumatic memories are reprocessed trough bilateral stimulation such as eye movements, sounds or tapping. EMDR helps the brain complete and integrate what was too flooded and overwhelmed to process at the time of the trauma.  It helps to restore more balance and flow allowing the mind and body to return to stability and homeostasis.

How EMDR Works: What Happens in the Brain During EMDR

The Role of Bilateral Stimulation in EMDR therapy

Movement desensitization and reprocessing

Bilateral stimulation via eye movements, tapping or alternating tones, is a primary component of EMDR. Studies suggest that bilateral stimulation increases working memory load which makes traumatic memories less vivid and less emotionally charged. The brain attempts to hold both the traumatic memory and the bilateral stimulation at the same time and it allows for desentization of the traumatic memory. Additional research indicates that bilateral stimulation supports interhemispheric communication, helping the brain access and integrate more completely which allows the trauma to process and resolve.

What Happens in the Brain During EMDR

Adaptive information processing

According to the adaptative information processing model, trauma is overwhelming not just because of the event itself but because the brain was too overwhelmed to process the trauma at the time. Instead of being stored by the hippocampus in a clear time stamped, detailed memory, the experience gets stuck in a raw sensory form. The emotional centers of the brain continue to trigger threat or alarm signals as if danger is present long after the threat has passed. EMDR helps to calm the overactive amygdala and strengthen communication with the prefrontal cortex and hippocampus. Clients often describe the experience as calming and integrating. They feel like they can refile a traumatic memory into long term storage  where it no longer hijacks their emotional or physical responses.

Bilateral Stimulation: EMDR’s Secret Power

Eye movement desensitization and bilateral stimulation

Bilateral stimulation is one of the most central elements of EMDR’s effectiveness. The left-right signals help the brain in several scientifically supported ways. Whether through eye movements, sensory tapping or auditory sounds, bilateral stimulation is powerful. Research by van den Hout and Engelhard demonstrate that bilateral stimulations increases working memory load which makes distressing images less vivid and less emotionally charged. Additionally studies suggest that bilateral stimulation enhances inter-hemispheric communication supporting the brain’s ability to integrate emotional and cognitive information that was previously disconnected by the trauma. Bilateral stimulation also helps decrease physiological arousal allowing the nervous system to shift out of survival mode into relaxation mode.

EMDR and Memory Reconsolidation

One of the most powerful ways that EMDR promotes healing is through memory reconsolidation. This is the brains natural process for updating emotional memories with new information. When a traumatic memory and emotional intensity is activated during an EMDR session, the brain enters a site where it can safely process or rewrite the emotional meaning attached to th experience. Bilateral stimulation helps the nervous system stay regulated whole the mind revisits what was once overwhelming. This allows emotions and sensory memories to be reprocessed and re-experienced in new ways. What was once triggering becomes simply a memory, integrated into a coherent narrative rather than relived through the body.

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