What Part of the Brain Does Prism Target for PTSD?

Key Takeaways

• The amygdala works like the brain's built-in alarm system, and in post-traumatic stress disorder (PTSD) it can get stuck sounding that alarm long after the danger has passed.
• Prism is a neurofeedback therapy (a type of brain training that shows you your own brain activity in real time) cleared by the U.S. Food and Drug Administration (FDA). It reads a validated, amygdala-based brain signal and shows it back to the patient as it happens.
• Unlike general relaxation techniques, Prism targets this one specific brain signal instead of only addressing outward symptoms like a racing heart or tense muscles.
• Over a series of sessions, patients practice a skill for calming their own stress response. Some patients find the skill carries over into daily life, though individual results vary.
• Diamond Edge TMS is an expert provider of transcranial magnetic stimulation (TMS) therapy in Vancouver, Washington, and also the first and only practice in the region offering Prism. Schedule an appointment with Dr. Jerald Block to find out if it's right for you.

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The Amygdala's Role in the Brain's Stress Response

The amygdala is a small, almond-shaped part of the brain that works like an early warning system. When it senses danger, it sets off the body's fight-or-flight response: a faster heartbeat, tense muscles, and a rush of alertness. Normally, that reaction fades once the danger has passed.

Another part of the brain, the prefrontal cortex (the area behind your forehead that helps with thinking and decision-making), calms the alarm once the threat is gone. Think of the amygdala as the gas pedal and the prefrontal cortex as the brakes. After trauma, the brakes can struggle to keep up. That leaves the alarm running longer and louder than the situation calls for.

Why the Amygdala Becomes Overactive After Trauma

PTSD is a mental health condition that can develop after someone experiences or witnesses a frightening or life-threatening event. It can lead to flashbacks, nightmares, and severe anxiety that persist well after the original event has ended.

Brain-imaging research has linked these symptoms to an amygdala that fires more easily and more intensely than it should. That is part of why the amygdala has become a focus for newer PTSD therapies.

Interestingly, while the amygdala is highly reactive if someone has PTSD, it is not necessarily so charged up if someone had, say, “generalized anxiety”.  The two disorders may seem similar in that anxiety is central to both.  Physiologically, though, they are distinct.  Indeed, PTSD might be best compared to phobias.  If one had, for example, a fear of heights and found themselves standing upon a cliff’s edge, their amygdala would be firing in overdrive – much like someone with PTSD experiences when they are triggered.

How Prism Measures and Reflects Brain Activity

Prism, developed by GrayMatters Health, is a neurofeedback therapy cleared by the FDA and built specifically around the amygdala's role in PTSD. During a session, patients wear a simple headset that acts as a electroencephalogram (EEG); it passively reads electrical activity from the brain. The headset is tuned to detect a specific brain signal linked to amygdala activity. As that signal shifts, an interactive simulation on a computer screen responds in real time. That gives the patient immediate feedback for every small success (or failure) when they try to  bring their stress response down.

This sets Prism apart from more general biofeedback approaches, which typically track outward signs of stress, like heart rate or muscle tension, rather than reading brain activity directly. Broader biofeedback can be genuinely useful for many conditions. Prism is designed to train the specific brain signal linked to trauma symptoms, not just a physical stand-in for stress.

Prism vs. General Relaxation Techniques

From the Clinic to Daily Life: Carrying the Skill Forward

A typical course of Prism runs for 15 sessions over about eight weeks. Over that time, patients practice their own unique mental strategy to lower and control their anxiety. Because the training targets the same amygdala signal that flares during real-world PTSD triggers, ideally patients find these same strategies also work outside the clinic.  In moments that would once have once set off a full stress response, patients may use their skill and  intervene.  While Prism does not work for everyone, for some it can be useful in interrupting a crippling cascade of anxiety.. .

Prism involves no medication but is designed to work alongside a patient's broader PTSD care. At Diamond Edge TMS, Dr. Jerald Block reviews each patient's history during a consultation to help determine with his patients whether Prism, TMS, or a combination of treatments is the right fit.

Try Prism Neurofeedback Therapy at Diamond Edge TMS

PTSD symptoms often feel like they're running on autopilot, driven by a brain that hasn't yet learned it's safe to stand down. Prism gives patients a direct, measurable way to retrain that response, without medication and without having to relive the trauma itself.

Diamond Edge TMS is led by Dr. Jerald Block, a board-certified psychiatrist and Army combat veteran, and serves military members, veterans, first responders, and their families. The practice accepts TRICARE, the health insurance program for military members and their families. Coverage can differ by treatment, so ask the team what applies to Prism.

Diamond Edge TMS is the first and only clinic in Oregon and Southwest Washington offering Prism. To find out whether this targeted, amygdala-based therapy could help with your PTSD symptoms, request an appointment with Diamond Edge TMS or learn more about Prism for PTSD.

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