Nervous System
A clear, jargon-free explanation of how your nervous system actually works, and why understanding it changes everything about how you approach healing.
If you've ever wondered why you go blank in an argument when you have so much you want to say, why your body freezes even when your mind wants to move, why you can know something intellectually and still not feel it in your bones, polyvagal theory has something important to tell you.
It's not a complicated theory, despite the name. It's actually one of the most clarifying frameworks I've encountered for understanding why humans do what we do under stress, and why healing sometimes feels like it should be faster than it is.
Here is the plain version.
For most of the twentieth century, the nervous system was understood through a two-part lens: the sympathetic system (fight or flight, activation, mobilization, stress response) and the parasympathetic system (rest and digest, calm, recovery). Stress on, stress off. The on-switch and the off-switch.
This map isn't wrong. But it's incomplete. It doesn't explain why, under certain kinds of threat, people don't fight or flee, they go still. Numb. Disconnected. Why someone can be both physiologically activated and emotionally flat. Why healing doesn't always respond to cognitive effort alone.
Polyvagal theory, developed by neuroscientist Dr. Stephen Porges in the 1990s, fills in what the old map left out. It identifies a third branch of the nervous system, and reorganizes how we understand all three.
Polyvagal theory describes a hierarchy of three distinct autonomic states. Your nervous system moves through them automatically, below the level of conscious thought, based on cues of safety and danger it's constantly reading from your environment and your body.
Ventral vagal, the social engagement state. This is home base. Connection, curiosity, creativity, warmth. When you're here, you feel present. You can think clearly, receive care, give care, be moved by things without being overwhelmed by them. This is the state where learning and healing happen most readily. The ventral vagal system is uniquely mammalian, it evolved specifically to support social connection and is accessed through the face, voice, and breath.
Sympathetic activation, fight or flight. When the nervous system detects threat, it mobilizes. Heart rate increases, muscles activate, attention narrows, digestion slows. This is intelligent and protective, it evolved to move you away from danger. The problem arises when the nervous system gets stuck here, or when it reads threat in situations that aren't actually dangerous. Chronic stress, hypervigilance, anxiety, reactivity, these are sympathetic activation states that have become a baseline.
Dorsal vagal collapse, freeze and shutdown. Further down the hierarchy is the oldest survival response: collapse. When mobilization fails, when there's no way to fight or flee, the nervous system defaults to shutdown. Numbness. Dissociation. Flatness. The sense of not being fully present in your own body. Depression has a strong dorsal vagal quality. So does the freeze response many people experience during or after trauma.
"Your nervous system isn't dysregulated. It's doing exactly what it learned to do to keep you safe. The question is whether those responses still serve you."
The most important thing Porges contributed, and the thing that has most changed how I work, is the concept of neuroception: the nervous system's constant, below-conscious scanning for cues of safety and danger.
Neuroception is not perception. It doesn't go through your thinking mind. It happens faster than thought, and it can be wrong. Your nervous system can detect threat in a safe situation because something in the environment pattern-matches to an old danger. It can keep you in sympathetic activation long after the threat has passed. It can keep you in dorsal collapse even when, logically, you know you're okay.
This is not a character flaw. It's not weakness or dysfunction. It's the nervous system doing its job with the information it has, information that was often encoded during periods when the threat was real and the adaptations made perfect sense.
You cannot think your way out of a nervous system state. This is the thing that frustrates people most. They understand the insight. They've done the therapy. They know what the pattern is. And still the body responds the old way.
That's because cognition lives in a different system than the one that's activated. You can't reason with a scared nervous system any more than you can reason with a startled animal. What you can do is create conditions of safety, gradually, consistently, somatically, that allow the nervous system to update its predictions and loosen the old protective responses.
This is a lot of what integration work actually is. Not excavating the past. Not analyzing the experience. Creating enough safety in the body, moment to moment, that the nervous system can slowly come home to ventral, and stay there for longer stretches. The insights are important. But the nervous system has to catch up to them. That takes time, repetition, and care.
Notice, without judgment, where you are right now. Not where you want to be, where you actually are. Activated and anxious? Flat and disconnected? Somewhere in between, with moments of genuine ease? Just naming the state is the beginning of working with it.
From there: slow your exhale. Let your eyes move around the room without fixing on anything. Feel your feet on the floor. These are ventral vagal cues, small signals of safety that the nervous system can register and respond to. They won't fix everything. But they're not nothing. They're the beginning of a different relationship with your own biology.
Nervous system work is at the heart of everything I do. If you want to understand yours more deeply, and learn how to work with it rather than against it, reach out for a discovery call.