Vincent Trapinaud
Polyvagal theory, proposed by the neuroscientist Stephen Porges, describes our autonomic nervous system not with two states (calm or stressed) but with three: social engagement when we feel safe, fight-or-flight mobilization in the face of danger, and immobilization, or freezing, in the face of a threat with no way out. The body shifts from one to another before we even think about it. The broad outlines of this map speak to many people and to clinicians; its evolutionary claims, however, remain hotly debated among researchers.
What is polyvagal theory, in one picture?
Think of an ordinary day. You walk into a room, someone smiles at you and says your name warmly: your shoulders drop, your breath widens, you feel like talking. An hour later, a curt message lands on your phone: your heart speeds up, your stomach tightens, your mind is already drafting its reply. In the evening, after a day that was too heavy, you collapse on the couch, drained, unable even to answer the person speaking to you.
Three scenes, three states of the body. None of the three was decided. Something in you settled the matter, faster than thought. This is the mechanism that Stephen Porges, an American researcher in psychophysiology, set out to describe. He presented his theory in the mid-1990s, then gathered it in 2011 into a reference work, The Polyvagal Theory.
His central idea fits in one sentence: our nervous system does not work like a simple switch between “stress” and “rest,” but like a ladder with three rungs, and it chooses its rung according to what it perceives in the environment, mostly without consulting us. The word “polyvagal” (literally, “of many vagus branches”) comes from the fact that Porges attributes two of these states to two different branches of the same nerve: the vagus nerve.
What exactly is the vagus nerve?
Let’s start with what is not in dispute. The vagus nerve is the tenth cranial nerve. It arises in the brainstem, at the base of the skull, and travels down through the neck, chest and abdomen, touching on its way the larynx, the heart, the lungs, the stomach and much of the intestines. Its Latin name, vagus, means “wandering”: it is the nerve that roams farthest through the body.
It is the centerpiece of the parasympathetic system, the half of the autonomic nervous system that slows down, digests, repairs. The other half, the sympathetic system, speeds up, mobilizes, prepares for effort. These two branches are not opposed like two enemies: they balance each other constantly, like the accelerator and the brake of a car you drive without thinking about it.
Two established facts are worth keeping in mind, because they shed light on everything else.
First, the vagus nerve listens more than it commands. The vast majority of its fibers carry information from the body to the brain, not the other way around. The heart, the gut, the lungs constantly report their state to the brain. In other words, a good part of what you “feel” rises from below before being interpreted above. William James sensed this as early as 1890, in a formula that book II of the Farmers trilogy, Le Troisième Miel (The Third Honey, currently published in French), places as its epigraph: we do not tremble because we are afraid; we are afraid because we tremble.
Second, the vagus nerve acts as a brake on the heart. At rest, it holds back the heart rate, which would be noticeably faster without it. And this brake never stays still: it eases slightly when we breathe in and tightens when we breathe out. Hence a well-measured phenomenon, heart rate variability: the interval between two beats keeps changing, and that is a good sign. A healthy heart is not a metronome. High variability generally signals a flexible system, able to adapt; low variability often accompanies chronic stress. The practical consequence: since the exhale tightens the vagal brake, lengthening the exhale slows the heart.
The three states of the nervous system according to Porges
On this solid foundation, Porges builds his map. Each state has a technical name and an everyday name; remember the second.
The state of safety: social engagement (ventral vagal)
When the body feels safe, a branch of the vagus nerve that Porges calls “ventral” takes the lead. The heart beats calmly, the breath is free, the muscles of the face come alive, the voice regains its modulations, the ear tunes in to human voices. This is the state of conversation, play, curiosity, tenderness. You can feel strong emotions in it, including sadness, without being swept away: you are here.
Porges stresses a point that moves many readers: this state is social. It is triggered and sustained above all by signals from others: a gentle look, a warm voice, an expressive face. We calm one another.
The state of mobilization: fight or flight (sympathetic)
In the face of danger, the sympathetic system switches on. The heart speeds up, blood rushes to the muscles, attention narrows onto the threat, digestion stops. This is the fight-or-flight reflex, the one that makes you jump back when a car comes out of nowhere. Lived from the inside, this state has many faces: anxiety, irritation, anger, urgency, agitation, being unable to sit still.
The state of immobilization: freezing and collapse (dorsal vagal)
When the danger seems extreme or inescapable, when neither fighting nor fleeing is possible, the body has one last strategy: to stop. Porges attributes it to another branch of the vagus nerve, called “dorsal,” older according to him. The rhythm slows, energy collapses, thinking blurs. Lived from the inside: emptiness, stupor, detachment, the feeling of being behind a pane of glass, sometimes shame, often exhaustion.
Porges presents these three states as a hierarchy. Under threat, we go down the ladder: first we seek help from others, then we mobilize, and as a last resort we freeze. To return to calm, we climb back up the same way.
Neuroception: your body decides before you do
Who chooses the state? Not you, or at least not your conscious mind. Porges coined a word for this silent assessment: neuroception. It is not a perception, since it happens below the threshold of awareness; it is a constant scan of the environment and of the inside of the body, tirelessly asking the same question: am I safe, in danger, in mortal danger?
Neuroception reads tiny cues: the intonation of a voice, a face that closes, a noise behind you, the rhythm of your own heart. It decides in a fraction of a second, and the body falls into line. Thought arrives afterward.
The trouble begins when it goes off balance. In someone who grew up without safety, it may see danger everywhere: in a slightly raised voice, a silence, a slammed door. Book II describes these reactions plainly: a forty-year-old adult who suddenly feels small and guilty, as at six, because a voice rises in a certain way. The person knows perfectly well there is no risk. That changes nothing in the reaction, because the reaction does not live in what they know.
That is why you cannot tell yourself “calm down” and get calm. Book II puts it sharply:
Freezing: when the body stops in order to survive
The third state is the least known, and often the most harshly judged. Many people who have gone through an assault, an accident, a humiliation, blame themselves for “not doing anything.” They wonder why they didn’t defend themselves, why they didn’t scream, why they just stayed there.
The answer is simple and freeing: it was not a choice. Immobility in the face of a threat is an ancient survival response, widely observed in animals, where it is called tonic immobility. The animal that plays dead did not decide to do so. Its nervous system decided for it, because at that moment it was the best chance of getting out alive.
The American therapist Peter Levine built much of his work on this observation. In Waking the Tiger (1997), he notes that wild animals, once the danger has passed, shake themselves, tremble, breathe deeply, then go back to their lives. The energy mobilized to survive is discharged. In human beings, this way out is often interrupted, by shame, by control, by the fear of looking weak, by the order to “pull yourself together.” Book II sums up Levine’s view this way: a survival response that could not run its course, stuck frozen in the body, waiting to be completed.
One nuance deserves to be made. In everyday language, “freezing” covers two rather different things: the tense, alert halt, heart pounding, like a deer in the headlights; and collapse, limp, switched off, dissociated. The first retains a strong share of mobilization; polyvagal theory links mainly the second to the dorsal state. In real life, the two often mingle. And if the event could never be discharged, the body may keep a protective posture years later.
Polyvagal theory and Reich’s armor: the same machine seen twice
In the 1930s, the psychoanalyst Wilhelm Reich was already describing what he called character armor: a set of chronic muscular tensions, formed early in life, that hold back the emotions we could not live through. A locked neck, a clenched jaw, a frozen diaphragm, kept up for decades after the threat that gave rise to them.
The chapter “What Science Says” in book II brings the two readings together. What Reich saw in the flesh, trauma researchers describe as a nervous system stuck in defense mode: protective responses frozen in place, maintained as if the danger had never ended. The vocabulary differs; the machine is the same.
Book II goes further, reading Alexander Lowen’s five character structures in the light of the three states. The rigid and the psychopathic would live in chronic mobilization, the schizoid and the masochistic in partial collapse, and the oral would swing between the two. None of these structures truly rests in safety.
The consequence: if the armor is a state of the nervous system, you cannot undo it with ideas. Understanding where your fear comes from is valuable, but it is not enough to untie it.
The Farmers’ reading: an alarm that produces Ba-Honey
This is where the trilogy offers its own hypothesis, which must be presented for what it is. In the universe of Les Fermiers (The Farmers), human emotion is a production, a “honey,” and certain forms of this honey are said to be harvested. Ba-Honey is the dark honey of fear, anger, anxiety, emptiness.
Reread the three states with these eyes. The two states of danger, mobilization and collapse, correspond exactly to the emotions that make up Ba-Honey: anxiety, anger and urgency on one side; stupor, dissociation and emptiness on the other. The state of safety, by contrast, feeling fully, in connection, in presence, without fleeing or shutting down, resembles feature for feature what book II calls the Third Honey: feeling while knowing that you feel.
Hence the hypothesis: a nervous system held in chronic alarm would produce Ba-Honey continuously. And everything that maintains this alarm, the information feeds that keep triggering mobilization, permanent urgency, the fatigue that leads to collapse, would keep production going. The article on social media, anxiety and anger shows how some online environments, without any concerted plan, tend to keep neuroception on alert.
None of this is scientific data. It is a way of reading the data, which the author offers as a map and not as a belief.
What is established, what is debated
Polyvagal theory has become very popular, in therapists’ offices as well as on social media. It is therefore often credited with more than it demonstrates. Let’s sort things out.
What is solid. The existence of the vagus nerve, its role in the parasympathetic system, the fact that it mostly carries information from the body to the brain, its braking action on the heart, heart rate variability and its link with breathing: all of this belongs to classical physiology, measured for a long time. It is also well established that defensive reactions (fight, flight, immobility) exist, that they are triggered before conscious thought, and that chronic stress weighs on the body. Finally, the soothing effect of a calm and safe presence, what clinicians call co-regulation, is a widely shared clinical observation.
What is debated. Several researchers in psychophysiology, including Paul Grossman, challenge pillars of the theory. They question in particular its evolutionary story (the idea that the “ventral” branch is an acquisition unique to mammals that made social life possible), the clear-cut attribution of the collapse state to a “dorsal” branch of the vagus, and the way Porges interprets certain cardiac measurements. According to these critics, comparative data across species do not support the proposed scheme. Porges and his supporters have replied, and the debate remains open. Book II acknowledges it plainly: the theory is “debated in its evolutionary claims.”
How do you return to calm when the body is on alert?
Since safety cannot be commanded, it has to be invited. Book II and its practical guide Assouplir la cuirasse (Softening the Armor) insist: not through willpower, but through physical signals the nervous system knows how to recognize. Here are the simplest. They claim to heal nothing; they offer the body a chance to come back down.
Lengthen the exhale
This is the most direct gesture, because it relies on the physiology described above. Breathe slowly, without forcing, letting the exhale last a little longer than the inhale. Book II suggests a simple rhythm: breathe in for about five seconds, breathe out for about five seconds, for a few minutes. Regularity matters more than depth. Don’t aim for a feat: never hyperventilate, never force the breath. If breathing consciously makes you anxious, simply return to a natural breath.
Sigh, hum
The body already knows the remedy: the sigh, that long release that rises on its own when a tension gives way. Sighing on purpose, two or three times in a row, imitates what a body does when it finally feels safe. Humming, mouth closed, on a low note, naturally lengthens the exhale and makes the throat and chest vibrate; book II sees it as one of the surest ways to invite calm.
Ground through your feet
When the mind races or shuts down, come back down into the lower body. Standing, knees slightly bent, bring your attention into the soles of your feet: the contact, the weight, the pressure of the floor. You cannot be fully in your feet and fully in your ruminations at the same time. Many people feel almost nothing at first: that is normal; stay there a little, without impatience. This gesture is also the recommended way back whenever an emotion becomes too strong: open your eyes, feel your feet, come back to the present.
A resting gaze, the presence of another
Neuroception scans the environment. So let your gaze settle slowly around you, without hunting, as if to check that the room is safe. And remember that the state of safety is social first: a conversation with someone calm, a warm voice, a presence that asks for nothing often soothe faster than any solitary exercise.
These gestures belong to a broader method, detailed in the article on the four gestures to soften the armor: ground, breathe, express, integrate. The principle that governs them is modest: little, but regularly. A few minutes each day are worth more than a big occasional effort. The point is not to live permanently in safety, but to open, through small windows, a way back. To accompany this work, card XVIII, “A Tranquility”, offers one: not the absence of ripples, but the quiet strength of someone who knows how to come back.
To go further: book II, Le Troisième Miel (in French), chapter VI, “What Science Says.”
