I’ve seen this happen many times in the world of healing, neuroscience, and trauma recovery: a serious academic debate enters social media, loses its nuance, and suddenly becomes a slogan. In this case, the slogan was simple: “Polyvagal Theory has been debunked.” 

But that is not what the recent scientific discussion actually says.

The more accurate question is: what is the recent critique of the Polyvagal Theory, and what does Stephen Porges say in response?

This matters because Polyvagal Theory has shaped how many therapists, somatic practitioners, trauma educators, coaches, and body-based healing communities understand nervous system regulation, safety, shutdown, co-regulation, and social connection. If the theory is being challenged, we should not panic. We should read carefully.

The Recent Critique: Why Some Scientists Call Polyvagal Theory “Untenable”

In 2026, Grossman et al. published a paper titled Why The Polyvagal Theory Is Untenable. The authors argue that several core claims of Polyvagal Theory do not align with established neurophysiology, especially in three major areas:

• autonomic organization, meaning how the autonomic nervous system is structured and functions
• respiratory sinus arrhythmia, or RSA, often used in Polyvagal Theory as a marker related to vagal regulation
• evolutionary framing, meaning the theory’s claims about how the vagus nerve and social engagement system developed across evolution

In plain language, the critics are not saying the nervous system is fake. They are not saying trauma responses are imaginary. They are not saying breathing, co-regulation, voice, rhythm, or somatic work have no value.

They are saying that some of the biological explanations used inside Polyvagal Theory may be too simplified, too broad, or not supported strongly enough by current evidence.

Stephen Porges’ Response: When a Critique Becomes Untenable

Stephen W. Porges responded in a scholarly paper titled When a Critique Becomes Untenable: A Scholarly Response to Grossman et al.’s Evaluation of Polyvagal Theory.

His central argument is not simply, “the critics are wrong.” It is more precise than that. Porges argues that the critique does not fully engage Polyvagal Theory as it is actually described in the peer-reviewed literature. Instead, he says the critique attacks a reconstructed version of the theory, shaped by category errors and misinterpretations.

That distinction matters. If you critique a simplified version of a theory, you may win the argument against the simplification, but you have not necessarily refuted the theory itself.

The Main Issue: Are The Critics Attacking The Real Theory Or A Proxy?

Porges argues that the critique fails because it does not meet what he calls the standards required for scientific refutation. In other words, to refute a theory, you must first represent it accurately.

According to Porges, the recent critique makes several structural mistakes:

• it confuses neuroanatomy with neurophysiology
• it reduces the theory to one measurement problem, especially RSA
• it treats evolutionary continuity as if it cancels functional organization
• it evaluates the theory at the wrong level of analysis
• it repeats older criticisms that Porges says were already addressed years ago

Let’s translate that into common American language: Porges is saying the critique does not fight the real opponent. It fights a cardboard version of Polyvagal Theory.

RSA: The Most Technical Part Of The Debate

One of the biggest points of disagreement is RSA, or respiratory sinus arrhythmia. RSA describes the natural rhythm where heart rate changes with breathing. Your heart tends to speed up slightly when you inhale and slow down when you exhale.

Critics argue that RSA should not be treated as a simple, direct, reliable measurement of vagal tone in all situations. This is a fair and important scientific caution. In fact, newer discussions in physiology also warn against oversimplifying respiratory-related heart rate variability as if it tells the whole story of vagal function.

But Porges’ response is that Polyvagal Theory is not reducible to RSA alone. He frames the theory as a systems-level model of autonomic state regulation, not a single biomarker claim.

This is where the debate becomes subtle. If RSA is imperfect, that may force measurement refinement. It does not automatically erase the broader clinical usefulness of thinking in terms of autonomic state, safety, threat, mobilization, shutdown, and connection.

What Is Actually Being Debated?

Implications For Somatic Shaking

This debate matters deeply for Somatic Shaking because it asks us to become more precise. If Polyvagal Theory is being challenged at the level of mechanism, then we should not use it as a rigid proof system. We should use it as a useful clinical map while staying honest about what is still evolving.

In Somatic Shaking, the body is not treated as a machine that must be hacked. It is treated as an intelligent living system that can discharge activation, reorganize tension, and return toward coherence when given enough safety, rhythm, and permission.

Neurogenic Tremor: The Body’s Discharge Language

Neurogenic Shaking refers to involuntary or semi-involuntary tremor patterns that may arise when the body releases held muscular tension and survival activation. In practical terms, this means the body may shake, pulse, vibrate, tremble, or move rhythmically when it is no longer suppressing unfinished stress responses.

Polyvagal debate or not, one thing remains clinically important: the body often carries stress below the level of thought. You cannot always think your way out of a physiological state. Sometimes the body needs breath, tremor, sound, orientation, contact with the ground, and time.

But here is the mature point: neurogenic tremor should not be sold as a guaranteed trauma cure. It should be approached as a body-based regulation practice that may support discharge, embodiment, and nervous system settling when done with pacing, consent, and integration.

Noogenic Shaking: Intentional Tremor That Can Become Neurogenic

Noogenic Shaking begins as intentional shaking. You consciously initiate the movement, not to force the body, but to invite it into rhythm, breath, awareness, and release.

At a certain point, the intentional tremor may become non-intentional. The body takes over. The shaking is no longer something you are “doing,” but something the nervous system is allowing. This is where noogenic tremor may become neurogenic tremor.

This distinction matters because Somatic Shaking is not only about calming symptoms. It is about creating the conditions where intentional movement can open the door to deeper, involuntary discharge, regulation, and embodied release.

Why The Critique Makes Somatic Work Stronger, Not Weaker

The recent critique of Polyvagal Theory does not weaken Somatic Shaking. It strengthens the need for clear language. We do not need to claim that every tremor is “dorsal vagal discharge” or that every breath pattern proves a specific vagal mechanism. That would be sloppy.

What we can say responsibly is this: Somatic Shaking may support nervous system regulation through rhythm, muscular release, breath, interoception, movement, and state awareness. These are practical pathways that can be felt directly and explored without pretending that every mechanism is fully settled by science.

This is the bridge: science gives us humility, practice gives us direct experience, and the body gives us feedback.

Why This Matters For Trauma, Somatic Work, And Nervous System Regulation

The truth is, most people do not come to somatic work because they want a debate about brainstem nuclei. They come because their body is exhausted, frozen, hypervigilant, shut down, anxious, disconnected, or constantly bracing for danger.

Polyvagal Theory gave many people a language for that experience. It helped people understand that dysregulation is not a moral failure. Shutdown is not laziness. Hypervigilance is not drama. Collapse is not weakness. These are nervous system states, and the body moves through them based on perceived safety and threat.

This is why the conversation matters for practices like Neurogenic Shaking and Noogenic Shaking. Neurogenic work speaks to the body’s capacity to discharge, tremor, reorganize, and regulate. Noogenic work brings in meaning, consciousness, direction, and the spiritual intelligence that begins to emerge when survival energy is no longer running the whole system.

You can also explore this directly through the Shaking Experience and the deeper foundation of Nervous System Regulation.

The Honest Position: Polyvagal Theory Is Being Challenged, Not Erased

Here’s what actually works: stop treating scientific theories like religions and stop treating critiques like executions.

Polyvagal Theory is being challenged. Some of those challenges are serious. They deserve careful attention, especially around RSA, anatomy, and evolutionary claims. But Porges’ response is equally serious: a critique must engage the theory as it is actually formulated, not as a simplified version that is easier to attack.

Science should refine our language. It should make us more precise. It should not make us throw away every clinical insight that has helped people understand their bodies.

What Practitioners Should Take From This Debate

• Do not say Polyvagal Theory is “proven” in every detail.
• Do not say Polyvagal Theory has been completely “debunked.”
• Use nervous system language responsibly.
• Be careful with claims about vagal tone, RSA, and shutdown states.
• Keep what helps people regulate, but stay honest about what is still debated.
• Speak about neurogenic tremor as a regulation and discharge process, not a guaranteed cure.
• Speak about noogenic shaking as meaning, consciousness, and spiritual orientation, not as a substitute for medical or psychological care.
• Remember that safety, co-regulation, breath, rhythm, and body awareness remain deeply relevant.

Final Reflection

The recent critique of Polyvagal Theory is not meaningless. It raises real questions about physiology, measurement, and evolution. But Stephen Porges’ response reminds us that scientific refutation requires accuracy, not just force. A theory cannot be properly rejected if it has first been misrepresented.

For my vibrant community of Shakers, this is the deeper lesson: do not worship theories, and do not worship critiques. Stay awake, stay embodied. Let science sharpen the mind and let direct practice humble the body.

Somatic Shaking lives in that honest place between evidence and experience. Neurogenic tremor gives the body a way to speak. Noogenic shaking gives consciousness a direction. Together, they remind us that regulation is not about becoming numb. It is about becoming available to life again.

The nervous system does not need ideology. It needs safety, rhythm, movement, breath, truth, and presence.