The Three Circuits: An Evolutionary Hierarchy

Take a combat veteran we’ll call Tom. Five years of cognitive-focused therapy behind him, and almost nothing to show for it. He’d been told his PTSD was “in his head” in the worst possible sense of that phrase — meaning psychological, meaning treat-the-thoughts-and-the-body-will-follow. It didn’t follow. Then a new therapist suggested something different: start with the nervous system before touching the thoughts. Tom was skeptical, understandably. But something about the explanation — polyvagal theory, specifically — landed in a way nothing else had. His nervous system wasn’t broken. It was doing precisely what years of surviving constant, real threat had trained it to do.

Stephen Porges spent decades studying the evolution and function of the autonomic nervous system before formalizing polyvagal theory in a 1994 paper, later expanded in his 2011 book, The Polyvagal Theory. It has become one of the most influential frameworks in trauma therapy, psychology, and holistic health circles. It’s also one of the most misunderstood — routinely flattened into a metaphor that strips out the mechanistic precision that made it clinically useful in the first place. What follows is the fuller picture: the theory, the evidence behind it, its clinical applications, and — this is the part that actually matters day to day — the practical tools that follow once the mechanism is understood.

The Three Circuits: An Evolutionary Hierarchy

Start with evolution, because that’s where polyvagal theory starts. The autonomic nervous system didn’t arrive fully formed. It built up in layers across vertebrate history, and those layers are still sitting in human neuroanatomy today as three distinct circuits that operate in a strict hierarchy.

The oldest of the three, the dorsal vagal complex (DVC), goes back to primitive vertebrates. It runs the unmyelinated fibers of the vagus nerve that serve the organs below the diaphragm — heart, gut, kidneys. When a threat registers as extreme and inescapable, the DVC triggers immobilization: heart rate drops, blood pressure falls, metabolism slows, the organism goes still. In animals this is playing dead — a last-resort defense that sometimes makes a predator lose interest, sometimes reduces the damage of an injury that’s already happening. In humans it shows up as dissociation, emotional numbing, physical collapse, shutdown, the flatness that defines severe depression. None of that is laziness. It’s an ancient defense switching on because the nervous system has calculated, correctly or not, that escape isn’t an option.

The second circuit, the sympathetic nervous system, evolved later and handles mobilization — fight and flight. Threat detected, the adrenals dump cortisol and adrenaline, heart rate and respiration climb, blood shifts toward the muscles, and the body gets ready to act. This is the one everyone already knows as “the stress response.” And in modern life it’s rarely resting: email, traffic, an argument, a bank balance — none of it life-threatening, all of it enough to keep the sympathetic circuit humming, which is the engine behind most chronic stress disease.

The third circuit is the newest. The ventral vagal complex (VVC) shows up only in mammals, and it’s the biological floor beneath social engagement. It governs the myelinated vagal fibers that regulate heart rate variability, the laryngeal muscles used in vocalization, the middle-ear ossicles tuned to human speech frequencies, and the facial muscles responsible for expression. When the VVC is running, the organism is in what Porges calls “safe social engagement” — calm, connected, able to feel and regulate the full range of emotion inside a socially connected context. This is the circuit underneath the social intelligence, empathy, and cooperation that make mammalian life, at its best, worth living.

The Neuroception: Safety and Threat Detection

One of Porges’ sharpest contributions is a concept he called “neuroception” — the nervous system’s automatic, below-conscious scanning for safety and threat. It’s not the same as perception. Nobody has to consciously decide “this is dangerous” for a defensive response to fire. The evaluation runs faster than conscious thought, through subcortical structures (the amygdala chief among them) that never stop scanning.

Certain cues pull the system toward ventral vagal safety: warm, melodic voices; familiar faces showing positive affect; social settings that read as non-threatening; environments with natural features and low sensory clutter; predictable rhythmic input — rocking, gentle touch, rhythmic music. Other cues pull toward sympathetic mobilization: flat, harsh, or high-pitched voices; expressions of threat or disgust; chaos; postures that read as dominant. And dorsal vagal shutdown gets triggered by overwhelming or inescapable threat, total loss of control, or — this one matters clinically — sensory environments so intense or chaotic they overwhelm the nervous system’s processing capacity outright.

Here’s the clinical weight of all this: neuroception can misfire. A nervous system calibrated by real, repeated threat starts detecting danger where none exists, or fails to register safety even when it’s genuinely present. That’s the core mechanism behind most trauma-related disorders — a system so thoroughly trained on threat that ordinary cues now trip sympathetic or dorsal vagal responses that wouldn’t fire in someone with a history of safety. Which means the therapeutic task isn’t arguing with the content of the thoughts attached to these states — that’s the CBT move — it’s rebuilding enough lived experience of actual safety that neuroception slowly resets its own threshold.

The Hierarchy and Trauma

The polyvagal hierarchy explains something purely psychological models never quite manage: what trauma actually does to a nervous system. Repeated overwhelming threat — abuse, neglect, violence, particularly of the interpersonal kind — recalibrates the whole system. The threshold for sympathetic activation drops, so hypervigilance becomes the default. Ventral vagal access — the capacity to feel safe, to connect, to self-regulate — gets impaired. And in severe or prolonged trauma, dorsal vagal shutdown turns into a habitual refuge, reached for automatically whenever sympathetic mobilization starts to feel like too much.

Which explains the symptom picture that otherwise looks contradictory in complex trauma: hypervigilance and hyperarousal sitting right alongside emotional numbing, dissociation, shutdown — with brief windows of real connection and regulated function that feel fragile, easily lost. The nervous system is oscillating between the two lower circuits without stable footing in the top one. Through the polyvagal lens, trauma therapy is fundamentally about building ventral vagal access — creating enough internal safety that the system can occupy, consistently, the state where healing and growth are even possible.

Somatic approaches to trauma — the ones working with the body and nervous system rather than primarily with thought and narrative — line up with polyvagal theory in a way cognitive approaches simply don’t. Somatic Experiencing (Peter Levine’s work), EMDR, sensorimotor psychotherapy, MDMA-assisted therapy — all of them work partly by offering the nervous system a corrective experience rather than new cognitive content. The nervous system learns through experience, not argument. Effective trauma treatment has to meet it where it actually learns.

Practical Tools: Ventral Vagal Resources

The practical work starts with identifying what Porges calls “ventral vagal resources” — the states, activities, relationships, and environments that reliably nudge a person toward ventral vagal. These are individual. What works for one person does nothing for another. But research and clinical experience have turned up some recurring patterns.

Physical resources: slow, rhythmic movement — walking, gentle yoga, swimming — activates vestibular-vagal pathways that support ventral vagal states, and the rhythm itself matters, since rhythm is one of the nervous system’s primary organizers. Group singing activates laryngeal VVC circuits directly. Safe touch — consensual, from someone trusted — engages the opioid and oxytocin systems underneath mammalian bonding. Horizontal rest, especially curled with knees drawn up, activates the neural programs built for early-life bonding posture. Cold water on the face triggers the dive reflex and shifts things toward vagal regulation almost immediately.

Relational resources: connection with people whose voices, faces, and physical presence the nervous system has already learned to read as safe is, hands down, the most potent ventral vagal activator mammals have — because co-regulation through exactly that mechanism is what mammals evolved to use. Identifying those people, deliberately, and spending time with them, is a genuine nervous system intervention, not a nice-to-have. For anyone short on safe human connection, animals — dogs and horses especially — offer social engagement cues that measurably activate the same ventral vagal circuits.

Environmental resources: natural settings reliably produce ventral vagal shifts relative to built or urban ones. Water especially — rivers, oceans, lakes, the sound of rain — correlates with rising HRV and parasympathetic activation. “Soft fascination” environments — natural scenes, firelight, an aquarium — hold attention gently, without demanding effort, and that alone lowers sympathetic activation. Shaping home and work spaces around these features isn’t decorating. It’s nervous system architecture, full stop.

Co-Regulation and the Social Nervous System

One of the least understood — and most important — insights in polyvagal theory: the mammalian nervous system regulates itself primarily through connection, not in isolation. Human infants arrive with an immature regulatory system that depends entirely on an attuned caregiver’s nervous system to do the regulating for it. A caregiver’s calm, prosodic voice and warm, responsive face teach the infant’s nervous system what safety actually sounds and looks and feels like. This isn’t a metaphor. An infant’s HRV rises measurably in the presence of an attuned caregiver and drops in the presence of a still, unresponsive face — real-time physiological co-regulation, happening in the room.

Adults keep this biology. Spend time near someone whose nervous system sits in a ventral vagal state — calm, open, warmly present — and your own system tends to entrain toward it. That’s the actual neurobiology underneath the therapeutic relationship: a therapist who can stay regulated while working with a dysregulated patient offers a co-regulatory resource no technique or advice can substitute for. And the same mechanism runs in reverse. Spend enough time around people whose nervous systems live in chronic sympathetic or dorsal vagal states — anxious, hostile, shut-down — and your own system gets pulled that direction too.

Which has a plain practical implication: the social ecology of a life matters physiologically, not just emotionally. That doesn’t mean cutting off everyone who’s struggling — impossible, and unkind besides. It means recognizing that some relationships and environments are genuinely ventral vagal and restorative, others are sympathetically draining or dorsal-vagal heavy, and being deliberate about the balance is part of taking care of a nervous system.

The Polyvagal Protocol

The Polyvagal Protocol offers a systematic way to map your own nervous system states, build access to ventral vagal resources, and work with the hierarchy instead of against it.

1. State Mapping: For one week, notice — not what you’re thinking, but which circuit you’re in. Sympathetic: heart rate up, mind racing, scanning, body tense. Dorsal vagal: flat, numb, disconnected, heavy. Ventral vagal: calm but alert, connected, curious, open. Just naming the state, without judgment or the urge to fix it, starts building the metacognitive awareness that underlies self-regulation.
2. Identify Your Glimmers: Porges uses “glimmers” for the micro-flashes of ventral vagal activation — brief moments of safety, connection, or beauty that can anchor the nervous system toward that state. Music, a stretch of nature, a particular relationship, morning sunlight, the smell of coffee, a pet’s warmth. Whatever reliably produces a glimmer is the most accessible ventral vagal doorway available.
3. Build a Resource Menu: Map what moves the system from sympathetic to ventral vagal, from dorsal vagal to ventral vagal, and what keeps it there once arrived. This takes trial and error. Common entries: slow breathing, bilateral stimulation (walking, EMDR, drumming), movement, creative work, animals, specific relationships, time in nature.
4. Practice Ventral Vagal Access Daily: Use the resource menu proactively, not just when things fall apart. Morning practices — breathing, a cold shower, a slow walk — train the system to launch the day from a regulated baseline. Brief check-ins through the day stop the slow drift into sympathetic activation before it accumulates.
5. Work With the Hierarchy: In sympathetic activation, move toward ventral vagal through movement first (burn off the mobilization energy), then connection, then a slower settling. In dorsal vagal shutdown, work up the ladder — gentle movement first, not vigorous, then mild sensory stimulation, then connection. Trying to leap from dorsal vagal straight to ventral vagal through positive thinking usually fails outright. The nervous system generally has to pass through the sympathetic circuit to reach ventral vagal from a shutdown state.
6. Address Trauma Through Body-Based Approaches: If repeated attempts at ventral vagal resources produce little that lasts — if the system keeps defaulting back to defense — body-based support may be worth exploring. Somatic Experiencing, EMDR, or a polyvagal-informed practitioner can help work with the stored threat experiences that keep neuroception misfiring.
7. Build Safe Relationships: Invest deliberately in relationships that reliably produce ventral vagal states. Limit time in the ones that consistently don’t. Not abandonment — recognition of a physiological reality, and protection of the regulatory resources that reality depends on.

FAQ: Polyvagal Theory Practical Guide

Q: Is polyvagal theory scientifically proven?
A: Polyvagal theory has a solid evidence base in its core claims about the evolution of the autonomic nervous system, the three-circuit hierarchy, and the relationship between vagal tone and social behavior. Some specific claims within the theory are still debated among neuroscientists — particularly the precise functional demarcation between dorsal and ventral vagal circuits in humans. The clinical applications, including HRV biofeedback, somatic trauma therapies, and social engagement interventions, have strong independent evidence. It’s best understood as a theoretically coherent framework with strong empirical support in its core claims and ongoing scientific refinement in its details.

Q: How is polyvagal theory used in therapy?
A: Polyvagal-informed therapy uses the three-circuit hierarchy as an organizing framework. Therapists track the client’s nervous system state throughout sessions and use interventions designed to build ventral vagal access — including somatic exercises, breathing, safe relationship experiences, and carefully paced trauma processing that doesn’t overwhelm the nervous system’s regulatory capacity. Popular modalities explicitly grounded in polyvagal theory include Somatic Experiencing, sensorimotor psychotherapy, and the work of Deb Dana, who has developed polyvagal-informed clinical tools for practitioners.

Q: Can children’s nervous systems be harmed by trauma?
A: Yes, significantly. The developing nervous system is more plastic than the adult nervous system — meaning it’s more influenced by experience, both positively and negatively. Repeated experiences of threat, particularly relational threat from caregivers, calibrate the developing nervous system toward chronic threat detection. This manifests in childhood as behavior problems, emotional dysregulation, and anxiety, and can establish autonomic patterns that persist into adulthood as chronic stress dysregulation, attachment difficulties, and vulnerability to trauma-related disorders. Early intervention is particularly valuable precisely because the developing nervous system is so responsive to experience.

Q: What’s the difference between polyvagal theory and traditional stress theory?
A: Traditional stress theory (the fight-or-flight model) recognizes two responses to threat: fight/flight (sympathetic) and a rest-recovery state. Polyvagal theory adds the third circuit (dorsal vagal immobilization), distinguishes between the two branches of the parasympathetic nervous system based on evolutionary history and function, introduces the concept of neuroception (below-conscious threat detection), and emphasizes the social engagement system as the primary mammalian regulatory resource. It’s a more evolutionarily grounded and clinically detailed framework than the simple two-state stress model.

Q: How does polyvagal theory explain freeze responses in trauma?
A: Freeze, in the polyvagal framework, is the dorsal vagal shutdown response activated when sympathetic mobilization (fight/flight) isn’t possible or has failed to resolve the threat. It’s an adaptive last-ditch defense — metabolic conservation when escape is impossible. In trauma survivors, this response can become habitual and automatic, activated by threat cues that don’t actually require it. The immobility, dissociation, and emotional numbness of freeze are not character flaws — they’re ancient biological defenses that got stuck. Treatment involves gradually building capacity to stay in the sympathetic circuit without tipping into freeze, and ultimately building consistent access to the ventral vagal state where threat-appropriate responses can be made without defensive shutdown.

Tom didn’t get better by learning to think differently about his trauma. He got better by learning to work with his nervous system instead of fighting it. He found his ventral vagal resources — long walks along the river, his dog, slow breathing before dawn while the house was still quiet. He built practices that pulled him out of the sympathetic hypervigilance and dorsal vagal shutdown that had been running the show, toward the ventral vagal connection he’d barely touched since before deployment. Slowly. Nervous systems shaped by years of combat don’t recalibrate on anyone’s schedule. But the direction changed. And for anyone who’s spent years stuck, the direction is the whole story.

Polyvagal Theory in Practice: Common Challenges

Understanding polyvagal theory on paper is one thing. Applying it mid-trigger, while sympathetic or dorsal vagal, is a different animal entirely. The prefrontal cortex — the part doing the rational understanding — is significantly offline once the nervous system tips into threat mode. Which means the resources least available in a crisis are exactly the ones cognitive strategies depend on.

That’s the central practical problem, and polyvagal-informed work addresses it a few ways. First: build “bottom-up” resources — body-based practices that don’t need much cognitive capacity. Slow breathing. Feet on the floor. A hand on the heart. Cold water on the face. These work at the level the nervous system actually operates at, not through cognition. Second: build the resources while regulated, not in crisis — strengthen the practices and connections that work when calm, so when dysregulation hits, they’re familiar rather than something new to figure out under duress. Third: start the day already regulated. Morning practices that establish ventral vagal tone before the demands pile up beat trying to find regulation from a depleted, triggered state later.

One more common snag: well-meaning attempts to regulate through positive thinking or distraction usually fall short for anyone with significant dysregulation. The nervous system doesn’t respond to affirmations. It responds to signals it can actually detect — body position, breath pattern, muscle tension, temperature, rhythm, and the autonomic state of whoever’s nearby. Interventions working through those sensory and somatic channels outperform purely cognitive ones for people whose systems have been shaped by real adversity.

Polyvagal Theory and Parenting

Polyvagal theory reshapes how parenting gets understood, because a child’s developing nervous system learns regulation almost entirely through co-regulation with its primary caregivers. A parent who understands their own states, who has real ventral vagal resources, who can stay at least somewhat regulated while their child is falling apart — that parent is providing the biological substrate the child’s own regulatory system is built from.

Children don’t learn self-regulation from discipline, consequences, or being told to calm down. They learn it by repeatedly experiencing regulation alongside an attuned caregiver — borrowing that caregiver’s nervous system until they build their own. This is why secure attachment sits at the foundation of long-term mental health: it’s the repeated experience of being co-regulated by a responsive caregiver, and that experience literally builds the neural circuitry for self-regulation. And it’s why a parent’s own regulation matters so much — a chronically activated parent can’t reliably co-regulate a child, because their own nervous system is stuck in self-protection rather than the ventral vagal engagement co-regulation actually requires.

The practical upshot: working on your own nervous system regulation isn’t indulgent. It’s the primary mechanism by which your nervous system shapes your child’s. And it doesn’t demand perfection. “Good enough” regulation — attuned and responsive most of the time, with repair after the inevitable misattunements — is what healthy nervous system development actually requires. Not a perfectly calm robot. A human who can usually find their ventral vagal footing and repairs the ruptures when they happen.

The Nervous System and Chronic Illness

Polyvagal theory carries real weight for understanding and addressing chronic illness, particularly the conditions covered elsewhere in this series — ME/CFS, MCAS, POTS, fibromyalgia, and other complex chronic presentations. None of that is “psychosomatic” in the dismissive sense. The biological mechanisms underneath these conditions are real and documented. But the nervous system’s regulatory state clearly influences how severe, how persistent, and how treatment-responsive these conditions turn out to be, through several distinct routes.

Sympathetic overdrive — one downstream consequence of a nervous system running chronically below its ventral vagal capacity — directly worsens many chronic illness conditions. It slows gut motility and raises gut permeability. It suppresses the immune surveillance that would otherwise keep viral reactivation in check. It sustains the low-grade inflammation that amplifies pain and fatigue. It disrupts the HPA axis in ways that undercut energy production and stress resilience. And it feeds the poor sleep that blocks tissue repair and immune reconstitution.

Building ventral vagal tone, by contrast, gives the body a neurological platform to run its own healing processes more effectively. That’s not the same claim as saying these conditions are caused by psychological distress, or cured by relaxation — it isn’t. It’s saying the nervous system’s regulatory state acts as a modifier variable across biological processes throughout the body, and improving that state is a genuine component of comprehensive care. The polyvagal framework gives a mechanistic reason why practices that read as “soft” — breathing, safe connection, nature exposure, somatic work — have real biological effects on conditions that are, mechanistically, thoroughly physical.

Measuring Polyvagal State: Beyond HRV

Heart rate variability is the primary quantitative measure of ventral vagal tone, but a few other accessible markers can also track polyvagal state and progress over time.

Voice prosody — the melodic quality of speech — reflects the state of the VVC circuits controlling the larynx. In ventral vagal states, voices are prosodic: varied in pitch, warm, rhythmically alive. In sympathetic activation, they rise in pitch, speed up, flatten out melodically. In dorsal vagal shutdown, they go flat, quiet, slow. Paying attention to your own voice — and the voices around you — hands over real-time neuroception information for free. Some voice-analysis software can now quantify prosody, and researchers are exploring it as a clinical assessment tool.

Facial affect monitoring — tracking the muscles the VVC circuits control — offers similar real-time state data. Micro-expression tools and facial action coding can pick up subtle shifts most people miss consciously. In clinical practice, somatically trained therapists learn to read the small facial and postural cues that reveal a patient’s polyvagal state moment to moment, titrating the session to whatever the nervous system can actually handle right then.

Breath rate and depth are easy to self-monitor: fast, shallow breathing signals sympathetic activation; very slow, barely-there breathing can signal dorsal vagal depression; full, slow, variable breathing with natural pauses reflects ventral vagal regulation. Thirty seconds, a few times a day, just noticing the breath without trying to change it — that alone provides useful self-monitoring data, and the simple act of attention often nudges the breath toward a more regulated pattern on its own.

Polyvagal Theory and Addiction

Polyvagal theory offers a neurobiological account of addiction that goes deeper than the standard “reward circuit dysregulation” story without contradicting it. Alcohol, opioids, cannabis, food, dissociative gaming — many addictive behaviors provide reliable, fast access to a specific nervous system state. Understanding which state a substance delivers, and which regulatory need it’s actually meeting, matters for understanding why it’s used and what would have to replace it for recovery to hold.

Alcohol reduces sympathetic activation — it’s a fast, accessible, reliable sympatholytic. For someone whose sympathetic system runs chronically hot (anxiety, PTSD, hypervigilance), the acute calming effect is a genuinely effective — if destructive — regulatory strategy. It’s meeting a real need through a harmful mechanism. Recovery approaches that go after the behavior alone, without offering an accessible ventral vagal resource to replace alcohol’s sympatholytic function, predictably see high relapse rates.

Opioids produce something close to dorsal vagal shutdown — the “nod” of opioid intoxication resembles the dorsal vagal freeze state physiologically: immobile, dissociated from pain and threat, metabolism slowed. For people with trauma histories who’ve learned to use dorsal vagal shutdown as a defense against intolerable experience, opioids can feel like they’re medicating the single most painful part of existing. Again: a real regulatory need, met through a catastrophic mechanism. Polyvagal-informed addiction treatment names this function directly and addresses it — building ventral vagal resources and trauma-processing capacity that make the substance’s regulatory function less necessary.

None of this excuses addictive behavior or minimizes its consequences. But it offers a more compassionate and more clinically useful answer to “why do you keep doing something that’s destroying your life?” than a purely cognitive frame can. In polyvagal terms: because right now, it’s the most reliable route to a nervous system state that feels survivable. The work is building better routes that don’t require the substance — which is what polyvagal-informed recovery support is actually trying to do.

Building Long-Term Polyvagal Resilience

Polyvagal resilience — the capacity to move flexibly through all three circuits as circumstances demand, and return readily to ventral vagal as home base — is the actual goal here. Not eliminating sympathetic activation, which is needed for appropriate threat response, motivation, and physical performance. Not eliminating dorsal vagal states either, which include the restful immobility of sleep and deep recovery. The goal is flexibility, and a reliable return to ventral vagal.

This resilience gets built the same way other kinds of physiological resilience do: repeated manageable challenge, followed by adequate recovery. In nervous system terms — activate sympathetic circuits through some challenge, then return to ventral vagal safety, and the nervous system’s confidence in its own regulatory capacity grows. The therapeutic concepts of “titration” (working with trauma in doses small enough not to overwhelm) and “pendulation” (moving between challenge and resource states) both describe this exact process of building polyvagal range.

Exercise, done right, is a near-perfect resilience builder: it deliberately activates sympathetic circuits — heart rate up, adrenaline released, muscles mobilized — then allows a return to vagal regulation during recovery. The post-exercise parasympathetic rebound, that elevated HRV and reduced sympathetic tone that follows adequate recovery, is a training effect on the nervous system’s regulatory capacity, not just a physical training effect. Which is part of why exercise’s mental health benefits run so strong, and why the endorphin hypothesis alone never quite explains them.

Long-term polyvagal resilience, at bottom, is a practice of learning to live in a body — attending to its signals, responding to its needs, not fighting its states but understanding what they’re for and working with the hierarchy rather than against it. Tom learned this. Not perfectly, not without setbacks. But the trajectory shifted from years of combat against his own nervous system to years of learning to work alongside it. And that shift — from combat to collaboration with your own biology — is what polyvagal theory, at its best, makes possible.

The research keeps expanding. Neuroimaging studies are mapping the cortical-subcortical pathways that process safety and threat cues. Clinical trials of polyvagal-informed interventions are underway in PTSD, chronic pain, depression, and autism. The framework Porges built is being refined, and in places challenged, by new findings — which is how good science is supposed to work. What isn’t changing is the core insight underneath the whole enterprise: the human nervous system is a social system, built for co-regulation inside safe mammalian community, and understanding that evolutionary biology is the key to understanding both what breaks down when safety disappears and what comes back when it’s restored.

That last sentence might be the most important one here. Human beings are social animals. Regulatory systems are built for safe connection — that’s the design spec. The epidemic of chronic dysregulation — the anxiety, depression, chronic pain, immune dysfunction that define so much of modern chronic illness — is partly a story of nervous systems trying to run without the social ecology they were built to require. Polyvagal theory doesn’t just diagnose the problem. It points at the fix: build the safety, connection, and co-regulation human nervous systems actually run on. Everything else follows from that.

Tom is still working his polyvagal resilience, though at this point it’s less a conscious effort than just a way of moving through the world. There are still days when the sympathetic system gets loud and the old shadows of combat show up uninvited. But he has his resources now, his practices, and — increasingly — a real sense that his nervous system isn’t the enemy. That the hypervigilance which kept him alive in combat and undermined him at home was never a failure. It was competence, aimed at a context that no longer existed. Polyvagal theory gave him the framework to see that clearly. And seeing it clearly, he could finally start to change it.

The Practical Framework: Applying Three Circuits Evolutionary Hierarchy In Real Life

References

• NIA Brain Health

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