Your Nervous System Isn’t Broken.It’s Doing Exactly What It Learned to Do.
- Becky VanDenburgh
- Jul 2
- 5 min read
Why Polyvagal Theory changes everything about how we understand anxiety, trauma, and emotional overwhelm.
You snap at someone you love over something small. An hour later you’re numb, checked out, unreachable even to yourself. The next day you’re fine, laughing, present, wondering what happened.
Here’s what happened: your nervous system shifted states. And if anyone has ever told you to “just calm down” or “stop overreacting,” this is the post that explains why that advice misses the point entirely.
Your reactions aren’t character flaws. They’re survival responses, and once you understand that, everything changes.
What Is Polyvagal Theory?
Polyvagal Theory was developed by neuroscientist Dr. Stephen Porges in 1994. In the simplest terms, it explains that your autonomic nervous system operates in three distinct states, and each state determines what you’re capable of thinking, feeling, and doing in any given moment.
The theory also introduces a concept called neuroception, your nervous system’s continuous, below-conscious scan for safety or threat. You don’t decide to feel unsafe. Your body decides first, before your thinking brain has even registered what happened.
The Three Zones
Look at the chart. Three zones. Green in the middle, red on top, blue on the bottom. Here’s what each one means in real life.
The Window of Tolerance (Green Zone)
This is where you can think clearly, feel your feelings without drowning in them, and actually connect with people. You have access to your prefrontal cortex, the part of the brain responsible for logic, empathy, and problem-solving. This is where therapy works. Where growth happens. Where you can have hard conversations and come out the other side.
Hyperarousal (Red Zone)
The sympathetic nervous system has fired. Stress hormones flood your body. Heart rate spikes. Your brain is now in survival mode, and the rational, empathetic part of it is largely offline. This is why yelling happens, why people say things they don’t mean, why “just calm down” is neurologically impossible in this state. It’s not a weakness. It’s biology doing its job.
Hypoarousal (Blue Zone)
When the threat feels inescapable, the nervous system does something even older than fight-or-flight: it shuts down. Goes numb. Disconnects. This is why trauma survivors can’t always speak during conflict, why people “check out,” why some days getting out of bed feels genuinely impossible. It’s not laziness or depression (though it can look like it). It’s the body’s most ancient survival response.
Why Trauma Narrows the Window
For people who grew up in unpredictable or unsafe environments, the nervous system learned early: the world is dangerous. That learning gets wired in at a cellular level. As adults, the window becomes narrow. It doesn’t take much to tip out of the green zone and into red or blue.
A slightly raised voice. A text that takes too long to come back. Feedback at work delivered the wrong way. These aren’t overreactions. They are a nervous system doing exactly what it was trained to do, in conditions that no longer exist.
The goal of trauma therapy isn’t to eliminate survival responses. It’s to widen the window so they’re not the only option anymore.
The good news is that the nervous system is genuinely plastic. The window can widen. With the right support, safety, and somatic practice, the body can learn that it doesn’t have to live on high alert.
What Helps: Tools That Work From the Body Up
Because dysregulation is a body-based state, thinking your way out of it rarely works. The most effective interventions are somatic, working with the nervous system directly.
Stanley Rosenberg’s Basic Exercise
Lie on your back, hands behind your head. Without moving your head, slide your eyes as far right as comfortable and hold until you yawn, sigh, or swallow. Repeat left. This simple movement increases blood flow to the brainstem and restores ventral vagal tone in under three minutes.
Deb Dana’s Vagal Brake Titration
Stand with weight evenly balanced. Slowly shift until you’re almost off-balance, then return. This tiny, controlled activation teaches your nervous system that it can mobilize and return to calm, building the very resilience the chart describes.
Sensorimotor Orienting
When someone is frozen or dissociated, closing their eyes and going inward often makes it worse. Instead: look around the room. Name what you see. Count the blue objects. This pulls the nervous system into the present moment without demanding emotional processing it can’t yet access.
Frequently Asked Questions
What is Polyvagal Theory in simple terms?
Polyvagal Theory, developed by Dr. Stephen Porges in 1994, explains that the autonomic nervous system has three states: safety and connection (ventral vagal), fight-or-flight (sympathetic), and freeze/shutdown (dorsal vagal). Your body shifts between these states based on unconscious threat detection called neuroception.
What is the Window of Tolerance?
The Window of Tolerance, developed by Dr. Daniel Siegel, is the zone of arousal where you can think, feel, and function effectively. Below the window is hypoarousal (freeze/shutdown). Above it is hyperarousal (fight-or-flight). Trauma therapy aims to widen this window over time.
Is Polyvagal Theory scientifically valid?
As of 2026, Polyvagal Theory is actively debated in academic neuroscience. A February 2026 critique by Grossman et al. in Clinical Neuropsychiatry challenged several foundational claims. Dr. Porges published a detailed rebuttal citing transcriptomic and optogenetic research. The clinical consensus: the framework’s utility for trauma treatment is well-supported, even as specific mechanisms continue to be refined.
What does dysregulated actually mean?
Dysregulation means your nervous system has moved outside its Window of Tolerance, into either hyperarousal (too much activation) or hypoarousal (shutdown). It is not a character flaw or a choice. It is an automatic physiological state change, and it can be worked with.
Ready to work with your nervous system instead of against it?
Polyvagal-informed therapy meets you where your body is, not where you think you should be.
ABOUT THE AUTHOR
Becky VanDenburgh, LCSW, LCAC
Becky is a Licensed Clinical Social Worker, Licensed Clinical Addiction Counselor, and EMDR-certified trauma therapist with over 22 years of experience. She is the founder of Think Well Live Well Counseling and Telepsychiatry, a women-led private practice serving adults across Indiana. She specializes in trauma, anxiety, depression, and EMDR Intensives, integrating somatic, polyvagal-informed, and evidence-based approaches to support lasting healing.
REFERENCES
Porges, S. W. (1994). Orienting in a defensive world: A Polyvagal Theory. Psychophysiology, 32(4), 301–318.
Porges, S. W. (2011). The Polyvagal Theory. W. W. Norton & Company.
Siegel, D. J. (1999). The Developing Mind. Guilford Press.
Dana, D. (2018). The Polyvagal Theory in Therapy. W. W. Norton & Company.
Van der Kolk, B. (2014). The Body Keeps the Score. Viking.
Grossman, P., et al. (2026). Why the Polyvagal Theory is untenable. Clinical Neuropsychiatry, 23(2).
Porges, S. W. (2026). When a critique becomes untenable: A scholarly response. Clinical Neuropsychiatry.
Chart created by ThinkWell LiveWell, based on Polyvagal Theory (Porges, 1994) and Window of Tolerance (Siegel, 1999).
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