Why We Don't Use Polyvagal Theory
By Justin DeGarbo, MA, AMFT · Founder & Clinical Director, Cathexis
Polyvagal theory is everywhere. It's in therapy offices, yoga studios, Instagram infographics, and bestselling books. If you've spent any time in the somatic or trauma therapy world, you've encountered the language: ventral vagal, dorsal vagal, the social engagement system, neuroception. It's become so embedded in how clinicians talk about the body that questioning it can feel like questioning the sun.
Cathexis doesn't use polyvagal theory. Not because we're contrarian. Because the neuroscience doesn't support it.
This matters — not as an academic debate, but as a clinical one. The frameworks you build a therapeutic tool on determine what it can and can't do. If the foundation is wrong, the interventions built on top of it will be limited in ways that aren't obvious until they fail. So let me explain what polyvagal theory actually claims, where it breaks down, and what Cathexis uses instead.
What polyvagal theory claims
Stephen Porges introduced polyvagal theory in 1994. The core claim is that the autonomic nervous system has three hierarchical circuits, each tied to a different behavioral state. The ventral vagal complex — the newest, evolutionarily — supports social engagement: calm, connection, safety. The sympathetic nervous system handles mobilization: fight or flight. And the dorsal vagal complex — the oldest — controls immobilization: shutdown, collapse, dissociation.
The theory proposes that these circuits activate in a specific phylogenetic hierarchy. Under threat, the newest system (ventral vagal) goes offline first, then the sympathetic system takes over, and if that fails, the dorsal vagal system produces shutdown. The concept of "neuroception" — the nervous system's subconscious detection of safety or danger — is Porges's mechanism for how the body decides which circuit to activate.
It's an elegant story. It gives clinicians and clients a shared vocabulary for describing states that are otherwise hard to articulate. "I went dorsal" is more precise and less pathologizing than "I shut down again." That clinical utility is real, and it explains the theory's popularity.
But clinical utility and scientific accuracy are different things.
Where it breaks down
The problems with polyvagal theory aren't minor quibbles. They're structural.
The phylogenetic hierarchy doesn't hold up. Polyvagal theory depends on the claim that the ventral vagal complex evolved uniquely in mammals and that the dorsal vagal complex is an ancient, reptilian system. Comparative neuroanatomy doesn't support this. Research published across multiple labs has demonstrated that the neural regulation of the heart via the vagus nerve is far more complex and phylogenetically conserved than the theory suggests. The clean three-tier hierarchy — reptilian freeze, mammalian fight-or-flight, uniquely human social engagement — doesn't map onto what we actually find when we look across species.
The vagus nerve doesn't work the way the theory describes. The vagus nerve is not cleanly divisible into a "ventral" social engagement branch and a "dorsal" immobilization branch with distinct, hierarchical functions. The vagus is a massively complex cranial nerve with multiple fiber types serving multiple organs, and its functions don't neatly sort into the behavioral categories polyvagal theory assigns them. The theory oversimplifies vagal neuroanatomy to fit its narrative.
Neuroception lacks a defined mechanism. "Neuroception" is presented as the nervous system's automatic detection of safety or threat, operating below conscious awareness. This is a useful clinical metaphor. But as a scientific construct, it lacks a specified neural mechanism, defined parameters, or falsifiable predictions. It describes something we all recognize experientially — the body responding before the mind catches up — but it doesn't explain the mechanism. It names the phenomenon and then treats the name as an explanation.
Multiple peer-reviewed critiques have been published over the past decade raising these concerns. This isn't fringe skepticism — it's mainstream neuroscience noting that a popular clinical framework has outpaced its evidence base.
Why this matters clinically
You might reasonably ask: who cares? If the language helps clients, isn't that enough?
It depends on what you're building. If you're a therapist using "ventral vagal" as shorthand for a client's experience of safety, no harm done. Language that helps people describe their inner world is valuable regardless of whether the underlying theory is perfectly accurate.
But if you're building a therapeutic tool — an app that processes somatic data, detects patterns, and delivers adaptive interventions — the framework matters enormously. Algorithms built on an inaccurate model of the nervous system will categorize states incorrectly, select wrong interventions, and miss patterns that a more accurate model would catch.
Cathexis is a clinical-grade tool. That means every algorithm needs to be grounded in frameworks that have survived rigorous scrutiny, not frameworks that feel intuitively right but lack empirical support.
What Cathexis uses instead
Cathexis is built on six frameworks that have withstood decades of empirical testing across multiple labs and research programs.
Constructed emotion theory, from Lisa Feldman Barrett's research, demonstrates that the brain constructs emotional experience in real time from interoceptive signals, environmental context, and prior predictions. Anxiety isn't a circuit that activates — it's a construction your brain builds from a racing heart, a tense room, and a lifetime of learned predictions. This means the body doesn't have fixed "states" to be categorized. It has signals that the brain interprets in context. That's a fundamentally different starting point than a three-tier hierarchy.
Predictive processing, from Karl Friston's work, explains how the brain generates predictions about incoming sensory data and updates its model based on prediction errors. This gives us a rigorous, mathematically formalized framework for understanding why certain body patterns persist and how they change — something neuroception gestures toward but can't specify.
Primary affect systems, from Jaak Panksepp's research, identify seven genetically encoded emotional circuits in the mammalian brain. Unlike polyvagal theory's three tiers, these circuits have been mapped to specific subcortical structures, validated across species through electrical stimulation studies, and replicated independently. They give us a granular, empirically grounded map of affective processing.
Somatic markers, from Antonio Damasio's work, demonstrate that body states participate directly in decision-making and cognition. This grounds Cathexis's body map in a framework where body signals aren't just symptoms to be managed — they're data the brain uses to construct experience.
Memory reconsolidation, from the research of Karim Nader, Daniela Schiller, and Bruce Ecker, shows that consolidated memories can be updated at the synaptic level when reactivated under specific conditions. This gives Cathexis a mechanism for lasting change that's been demonstrated at the cellular level — not just a metaphor for "rewiring."
Neuropsychoanalysis, from Mark Solms's work, establishes that consciousness originates in subcortical affect, not cortical cognition. The feeling body is primary. This is why Cathexis starts with sensation rather than thought — it's working at the level where conscious experience actually begins.
None of these frameworks are perfect. Science doesn't work that way. But each has been subjected to rigorous testing, replication, and critique — and has survived. That's the standard we hold ourselves to.
The real question
The question isn't whether polyvagal theory helps people feel understood. It does. The question is whether it's the best foundation for a tool that processes real somatic data and makes real clinical decisions based on that data.
We don't think it is. Not because the intentions behind it are wrong, but because the neuroscience offers better options — options that are more precise, more empirically grounded, and more capable of supporting the kind of pattern detection and adaptive intervention that Cathexis delivers.
Your body is generating data right now. The question is what framework you use to interpret it. We chose the ones that have earned that responsibility through evidence.
Cathexis is a somatic therapy app grounded in neuroscience. Learn more about the science behind it →