Nervous System
Polyvagal Theory in Plain English
Polyvagal Theory is the most useful framework for understanding human behavior that almost nobody learned in school. Once you have it, you stop asking 'why am I like this' and start asking 'which state am I in.' That single shift changes how you read yourself, your relationships, and the entire concept of healing.
Three states, not two.
The old model said your nervous system has two modes: rest and stress. Stephen Porges proposed in 1994 that there are actually three, organized in a hierarchy. The theory is called Polyvagal because the vagus nerve has two distinct branches that produce two of those three states.
- Ventral Vagal — the safe and social state. You feel grounded, curious, connected. This is where healing, learning, digestion, and intimacy happen.
- Sympathetic — the mobilization state. Heart rate up, muscles primed, attention narrow. You're ready to fight or run. Useful for sprints, deadlines, real danger. Ruinous if you live there.
- Dorsal Vagal — the shutdown state. Old, primitive, evolved before mammals. When fight or flight isn't possible, the body collapses. Numbness, dissociation, depression, the freeze response.
Neuroception — the part you don't control.
Your body decides which state to be in before your conscious mind catches up. Porges calls this neuroception — the nervous system's threat detection running below awareness. It scans faces, tones of voice, postures, environments, and internal sensations, then assigns a state. You don't choose it. You can only notice it and respond.
This is why telling an anxious person to 'just calm down' is technically violence. Their nervous system has already perceived a threat. Words from their cortex don't reach the part of the brainstem that made the call.
The ladder.
Deb Dana, the clinician who turned Polyvagal Theory into something usable, describes the three states as a ladder. Healing means climbing. Most people are stuck partway up, oscillating between sympathetic activation and dorsal collapse, rarely touching ventral.
Reading the ladder in your own day
Stuck in traffic, gripping the wheel? Sympathetic. Doomscrolling at midnight, numb? Dorsal. Cooking dinner with someone you love, music on, no rush? Ventral. The work is noticing — not judging.
Why talk therapy alone often fails.
If your nervous system is in dorsal shutdown, your prefrontal cortex is offline. You can't think your way out of a state your brain doesn't have access to. This is why somatic approaches, breathwork, EMDR, and bodywork have exploded — they enter through the body, which is where the state lives.
Co-regulation: we heal through other people.
The single most powerful intervention for a dysregulated nervous system isn't a protocol — it's the presence of another regulated nervous system. A calm friend. A steady therapist. A grounded practitioner. Your body reads theirs through micro-expressions, vocal prosody, and breathing rhythm, and follows.
This is why isolation is so corrosive and why community is medicine. We are not designed to regulate alone.
"Connectedness is a biological imperative."
— Stephen Porges
What to do with this.
- 1Learn to name your state. Sympathetic, dorsal, ventral. Out loud, ten times a day, until it's automatic.
- 2Ask: what does this state need? Sympathetic needs discharge — movement, exhale, shake. Dorsal needs gentle activation — sunlight, walking, warm food, low stimulation. Ventral needs nothing. You're already there.
- 3Build co-regulation into your week. One meal, one walk, one practitioner. Real proximity, not screens.
One letter. Every Sunday.
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