Polyvagal Theory Is Being Challenged. Here's What You Need to Know
In 2025, 38 neurophysiology researchers published a formal evaluation calling polyvagal theory "untenable." If you have encountered polyvagal language in therapy, in self-help content, or while trying to make sense of your own nervous system, you deserve a straight answer about what is happening. The word "untenable" sounds scarier than the situation is.
What the Controversy Is About
Polyvagal theory (PVT) was developed by researcher Stephen Porges in 1994. Its central model: the autonomic nervous system organizes responses through three hierarchical states. A ventral vagal state linked to feeling safe and socially engaged. A sympathetic state activating fight-or-flight. And a dorsal vagal state associated with shutdown or freeze. Porges proposed these states reflect an evolutionary progression and connect to specific pathways in the vagus nerve.
In 2023, researcher Paul Grossman published a systematic review in Biological Psychology evaluating all five foundational premises of PVT. His conclusion: none of them hold up against current neurophysiology evidence. Then in 2025, Grossman and colleagues co-authored a formal paper titled "Why the Polyvagal Theory Is Untenable" in Clinical Neuropsychiatry. Of 39 researchers invited, 38 agreed to co-author.
Not one contrarian on the internet. A near-consensus among specialists in the field.
Porges has responded, arguing the critics are evaluating a distorted version of the theory rather than the full formulation from his primary literature. His rebuttal was published in the same journal. The debate is active and ongoing.
The Specific Claims Being Challenged
Vague reassurance ("the core is still fine") does not build trust when specific anatomical claims are under scrutiny. Understanding what those claims are gives you a better read on what matters.
Three premises are under the most serious challenge.
Premise one: RSA as a measure of vagal tone.
Polyvagal theory uses respiratory sinus arrhythmia (RSA), the variation in heart rate during breathing, as its key physiological index. PVT presents higher RSA as evidence of stronger vagal tone and more nervous system flexibility. Grossman's 2023 review challenges this directly. Breathing rate, tidal volume, and metabolic demands all affect RSA in ways making the RSA-to-vagal-tone relationship unreliable. The correlation exists, but the relationship is not as clean as PVT implies.
Premise two: dorsal vagal shutdown.
PVT holds: the dorsal vagal motor nucleus (DVMN) drives freeze, dissociation, and shutdown responses in mammals. This claim runs throughout trauma-informed therapy language. Grossman's review finds no credible evidence supporting the DVMN as the driver of these responses in mammals. Critics describe this as the most directly challenged premise in the entire theory.
The experience of freezing or shutting down is real. The specific anatomical explanation for why is more contested than PVT typically presents.
Premise three: the ventral vagal complex as uniquely mammalian.
PVT frames the social engagement system as a mammal-exclusive evolutionary development mediated by a specific vagal pathway. Critics cite comparative neuroanatomy research showing non-mammalian animals have comparable pathways. Myelination of the ventral vagus is uniquely mammalian; the structure itself is not. The evolutionary sequencing Porges proposes does not hold up against the anatomical record.
What Has Not Been Challenged
This is where the post earns its keep. The scientific debate targets specific mechanistic anatomy. Three core clinical concepts associated with polyvagal-informed practice are not in the line of fire, and understanding why matters more than the anatomical dispute.
Hierarchy
The autonomic nervous system moves through states in a recognizable sequence: social engagement to fight-or-flight to shutdown. This sequencing matches clinical observation and is supported across multiple nervous system models, not only PVT. A therapist who teaches you to notice whether you are activated, regulated, or shut down is not teaching you something the 2025 paper undermines. The sequence maps onto experience reliably regardless of which nucleus gets the anatomical credit.
Neuroception
Your nervous system scans continuously for safety and threat below conscious awareness and shifts physiological state accordingly. This concept holds up across many nervous system frameworks, not as a polyvagal-exclusive claim. The neuroception framework is well-supported by research on interoception, predictive processing, and autonomic regulation broadly.
One clinical nuance worth noting here: neuroception is sometimes taught in ways framing high threat sensitivity as broken or "faulty." For people with marginalized identities, or anyone who has lived in genuinely unsafe environments, sensitivity to threat is often an adaptive and rational response. The issue is not your nervous system misfiring. The issue is the environment sending real signals. The distinction matters in how this concept gets used clinically.
Co-regulation
Attunement with another regulated nervous system is a genuine mechanism for shifting your own state. The evidence base runs through attachment research, interpersonal neurobiology, and therapeutic outcomes literature. Co-regulation as a clinical practice does not depend on polyvagal anatomical claims. Multiple independent research traditions support the same finding.
A note on window of tolerance: this is not a polyvagal theory concept. Window of Tolerance draws on related research but stands independently. Using window of tolerance in therapy or self-care does not depend on PVT's mechanistic claims at all.
The tools most commonly described as polyvagal-informed, including slow exhale breathing, fight-flight-freeze awareness, sensory grounding, and co-regulation with an attuned person, overlap with CBT protocols, mindfulness-based interventions, and somatic therapies. The evidence base for these practices does not belong exclusively to one theory.
The Bigger Picture: PVT vs. a Polyvagal Framework
There is an important distinction between polyvagal theory (Porges' specific 1994 model and its anatomical claims) and a polyvagal framework (the broader clinical application integrating PVT concepts with attachment theory, emotional regulation research, and other ANS models).
Most therapists and most therapeutic applications are working within the framework, not the strict theory. The framework does not rise or fall with the disputed anatomical premises.
The clinical vocabulary, using ventral, sympathetic, and dorsal as descriptive categories for experiential states rather than as strict anatomical assignments, retains utility as a map. Maps are not wrong because the terrain is more complex than the map shows. Maps are useful when they help people orient. The debate scientists are having about mechanisms is a different conversation from whether the map helps you move through a hard week with more awareness than you had before.
The polyvagal theory guide published here explains the model as Porges framed the theory. The criticism does not erase the usefulness of this vocabulary. The criticism asks clinicians and clients alike to hold the anatomical claims with more humility than the theory's popularization often encouraged.
What This Means If You Are in Therapy or Using This Language on Your Own
The nervous system is real. Autonomic states are real. The experience of feeling safe, activated, or shut down is real. No peer-reviewed paper changes any of this.
If the polyvagal framework has helped you understand your own responses, the understanding holds. The metaphor works even if some of the underlying anatomy is more complicated than originally described.
If your therapist uses polyvagal language, this is worth a conversation, not a reason to stop. Good therapists update their frameworks as evidence evolves. The clinical value of co-regulation and neuroception-informed work does not depend on which nucleus does what.
One specific teaching worth holding more carefully: the framing of dorsal vagal shutdown as a direct anatomical explanation for freeze or dissociation. The experience is real and documented. The precise anatomical mechanism is more contested than often taught. A therapist who responds to the nuance with curiosity is a better sign than one who defends the anatomy.
If you are working through anxiety and want a therapist who tracks how the evidence evolves, online anxiety therapy is one option. Taylor works with clients across Idaho, Utah, Colorado, Connecticut, Delaware, South Carolina, and Florida.
The debates researchers have about mechanisms are not debates about whether your nervous system is worth paying attention to. Models get updated. The body keeps signaling. Keep paying attention to yours.
Things to Try After This Post
Notice if you feel anxious about the debate itself. Anxiety about whether your anxiety tools are legitimate is a recognizable loop. The tool worked last time. Start from your own direct experience.
A few options:
Track one week of moments when a regulation skill shifted something. Slow breathing, a pause before reacting, a brief grounding check. You are collecting your own data.
If you work with a therapist, bring this up. A therapist who responds to questions with curiosity rather than defensiveness is a good sign.
Read critically. Porges' rebuttal is published in the same journal as Grossman's evaluation. Both are accessible if you want the full picture.
Look into what vagal tone means as a concept and how the RSA debate affects how you think about vagal tone.
FAQ
Has polyvagal theory been debunked?
The theory is contested, not definitively disproven. A 2025 paper co-signed by 38 neurophysiology experts called its foundational claims untenable. Porges published a formal rebuttal in the same journal. The scientific discussion is ongoing, and "debunked" overstates where things stand right now.
What is the difference between polyvagal theory and a polyvagal framework?
Polyvagal theory refers to Porges' specific 1994 model and its anatomical claims about the vagus nerve. A polyvagal framework refers to the broader clinical application integrating those concepts with attachment theory, emotional regulation research, and other ANS models. Most clinical practice uses the framework. The framework does not depend on the disputed anatomical premises holding up.
Is dorsal vagal shutdown real?
The experience of freezing, dissociating, or shutting down is real and well-documented across clinical practice. The specific claim: the dorsal vagal motor nucleus drives those responses in mammals, is one of the most directly challenged premises in the 2025 research evaluation. The experience and the anatomical explanation are separate claims, and the experience is the one holding up.
What is neuroception?
Neuroception is the process by which the nervous system scans for cues of safety and threat below the level of conscious awareness and shifts physiological state accordingly. The concept is supported across multiple nervous system models, not only polyvagal theory. High threat sensitivity is not automatically a sign of dysfunction. For many people, particularly those with histories of unsafe environments or with marginalized identities, high threat sensitivity reflects an adaptive and rational response.
Does polyvagal theory criticism affect how anxiety therapy works?
For most clients, the clinical impact is limited. The tools associated with polyvagal-informed therapy, including breath regulation, co-regulation, and tracking autonomic states, are supported across multiple evidence-based frameworks. A challenge to the anatomical premises of one theory does not undo the evidence from overlapping approaches. If you have questions about your therapist's approach, asking directly is a good use of session time.
About the Author
Taylor Garff, M.Coun., LCPC, CMHC, LPC, CCATP is a licensed therapist with over 10 years of experience helping adults manage anxiety, overwhelm, and identity challenges. He is licensed in Idaho (LCPC #7150), Utah (CMHC #6004), Colorado (LPC #0018672), Connecticut (LPC #8118), and Florida (TPMC #1034). He is certified in HeartMath, Safe and Sound Protocol (SSP), and breathwork facilitation. Taylor is the founder of Inner Heart Therapy, where he provides online therapy across multiple states.
