The polyvagal theory is dead - and HRV isn't a simple indicator of arousal

I was recently struck by Baxter's Substack post (its title copied to be the title of this MindBlog post), which noted work critical of Porges' Polyvagal  theory (or PVT) published iin the journal Clinical Neuropsychiatry, because it calls into question one idea commonly derived from this theory that I have accepted (and repeated in several MindBlog posts): that heart rate variability can be taken as a simple indicator of calm (higher HRV and parasympathetic nervous activity) versus arousal (lower HRV and sympathetic nervous system activity).  A number of bio-monitors such as the Apple Watch and the Oura Ring report ongoing HRV measurements.  Here is a clip from her article, and then the abstract of the multi-author paper she references.

Psychological safety, social engagement, co-regulation, emotional freezing, dissociation — these are real phenomena, supported by decades of research that predate PVT. They come from attachment theory, trauma research, and somatic practices. The (critical paper’s authors explicitly state that body-mind therapeutic methods “may confer benefits on their own.”

So the work stands.

What doesn’t is the specific neuroanatomical story Porges constructed to explain these states, i.e. what drives them. This is the now-familiar three-tier hierarchy: dorsal vagal shutdown, ventral vagal social engagement, sympathetic activation.

Porges got the clinical observations right—or rather, he built upon clinical observations that were already well-established. But the mechanism is wrong.

Concerningly, Porges continued to assert that mechanism for thirty years, even as the evidence mounted against it, and apparently misrepresenting and distorting the work of other scientists to support his claims. Rather than engage with criticism of his theory, Porges ignored the overwhelming scientific consensus and instead promoted this inaccurate framework as sound, misleading practitioners and clients alike.

There is good news in all this mess—for clinicians at least. What you observe in your clients is real. Hyper-arousal is real. The need for safety and co-regulation is real. People really do dissociate, numb, and freeze when overwhelmed. Your interventions still work. They just don’t work for the reasons PVT said they did.

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Here is the Grossman (+38 co-authors) summary:

This article specifically appraises--based upon the current state of knowledge of autonomic function and vertebrate evolution--several major elements of the PVT, as described in Porges (2025a) and elsewhere. These include: 1) the validity of PVT assumptions that respiratory sinus arrhythmia is a direct measure of the extent of central vagal drive to the heart; 2) PVT characterizations regarding the neuroanatomy and functions of two major brainstem vagal nuclei, the ventrally situated Nucleus Ambiguus and the Dorsal Motor Nucleus of the vagus nerve; 3) PVT assertions regarding the evolution of the vagus nerve; 4) PVT claims about the specificity of mammalian social behavior in relation to nonmammalian vertebrates, and 5) PVT interpretations of earlier seminal physiological literature. All co-authors agree that major tenets of the PVT are not supported by past or current knowledge and, in several instances, are inconsistent with the broader evidence base. Since the topics addressed constitute fundamental premises of the PVT, we conclude that the PVT is untenable, because it is not defensible based on existing neurophysiological and evolutionary evidence. The psychological elements composing the superstructure of the PVT are primarily derived from earlier psychological literature and are neither clarified nor strengthened by PVT constructs that lack evidence. This article does not intend to address alternative explanations about relations between vagal function and psychological processes, although such explanations do exist. 

The text of this article is mind-numbingly detailed and complex, as is a rebuttal of the critique by Porges in the same issue of Clinical Neuropsychiatry.   

 

Enlightenment, Habituation, and Renewal - non-dual awareness as the opiate of the thinking classes.

Enlightenment traditions in Abrahamic, Buddhist, Hindu, or other schools of meditative insight have a common issue. How can the central canon or dogma of the way things are be renewed and kept fresh? The usual practice is to repeat a liturgy set down by gurus or priests of a given tradition. The problem is that with each repetition the message  begins to loose its force. The transforming clarity of the initial enlightenment fades as the habituation and desensitization associated with all repetitive activities begins to set in. Temporary resets can sometimes be found by turning to different vendors of the central message who  deliver their respective theory or practice sessions in sonorous and calming voices, in person or online. Longer lectures from workshops or retreats have yielded audience share to increasingly  brief presentations that accommodate the diminished attention spans of those under 30 who have never known a world without social media. They can prefer to absorb information in transient instances of tik-tok mind, X/twitter mind, or instagram mind seconds to a few minutes in duration.

I have listened to several hundred instructional lectures. As I see the same basic points reframed in many different ways, it is clear that the fundamental axioms of enlightenment that are expressible in language are being repetitively rediscovered throughout history and repeatedly archived.  I feel like their verbal messages are as ingrained in my consciousness as the language of the mathematical and chemical structures I have known most of my life.

My flippant 'non-dual awareness as the opiate of the thinking classes’ phrase in the title of this post is meaning to point to the fact that the market for vendors of enlightenment is a distinctive one. Existential angst, or worrying about value, purpose, and meaning seem most pressing to a relatively small number of highly urbanized and literate humans. I can’t imagine that my two Abyssinian cats, who I sometimes takes to be my best role models, spend a significant fraction of their time worrying about the meaning of it all, or pondering the subtleties of epistemology and ontology. 

So...what beyond words? A space or perspective that doesn’t contain them can only be pointed at by using them in the dualistic linguistic context of a sender and receiver. I can, for example, try to use words to give a crude voice to the mute homeostatic generative visceral organic axes of valence and arousal that underlie and generate everything that I am and experience right now: “Dude, get a grip, I (the visceral one) am the one who is actually running this show, deciding where it goes and whether it works or shuts down. The sooner the “I” you imagine yourself to be realizes this and lets go, the sooner some kind of sane space is attained. All of the surface behaviors acted out for others to see - Deric the family man, the professor, the pianist - are shadow play shimmering on the surface of this basic organic substrate, like water insects skittering around on the surface of a pond. What is writing these words is just another one of the contents of consciousness flitting past. Just turn yourself around to look quickly for the writer…what do you see? What do you see as you imagine being first born into this world? The brief glimpses of expanded naive awareness sometimes elicited by questions such as these have the potential of permitting a scrubbing, refreshing, or renewal of consciousness in a way that permits more choice in selecting which prior individual selves and self habits rise to compose current self conscious life. 

Different iterations of these sentiments, different vendings of the sort mentioned in the first paragraph above, can be found in two previous MindBlog posts. One from Nov. 25, 2022:  

Perhaps an increasing number of people who engage techniques for facilitating non-dual awareness find themselves seeing and experiencing the "I" or self that feels threatened by our anxious times from a more useful perspective - an inclusive expanded awareness that includes the reporting "I" or self as just one of its many contents that include passing thoughts, perceptions, actions, and feelings.  A calm can be found in this expanded awareness that permits a  dis-association of the experienced breathing visceral center of gravity of our animal body from the emotional and linguistic veneer of politics and conflict. This does not remove the necessity of facing various societal dysfunctions, but offers the prospect of doing so without debilitating the organic physiological core from which everything we experience rises.  

And the other from Oct. 26, 2022, , passing on a masterful exposition from James Low that I can not improve on.

If you want stability, if you want real peace, you already have that in the nature of awareness. But if you look to manifestation, to patterning of yourself, to thinking you could establish a stable personalty, to live a life in which you were happy all the time, or in which you were your own person, that way madness lies. To find our original face, to find the ground of our primordial being, we need to release our fixation on the dialogic movement of subject and object, and allow ourselves to be the space within which the movement of experience is occurring. Awareness means being aware that we are present without being something as such. This is a great mystery. When we look at phenomena the world, things exist as something. A car is not a cow, an apple is not an orange, compare and contrast, category allocation. That’s how our cognition, our conceptual elaboration functions to give a seemingly enduring structure to identifications. But awareness can’t be caught. It’s not a thing. You can’t pin a tail on the donkey, there is no donkey there. The mind is not an object for itself, it is self luminous awareness, but you can’t catch it. You can never know your mind but you can be your mind. We are awareness and that’s a very important distinction. 

(The above is an updated,  revised and edited version of my Jan. 2, 2023 post.) 

Value, Purpose, Meaning, Futures

Value, purpose, and meaning vary between  religions and cultures, and are best viewed as emergent properties supporting altruistic behaviors bonding us into groups that have proven to be more successful at sustaining themselves over multiple generations.   I take the value, purpose, and meaning of my life as being to exist as an expanded present centered awareness that encompasses all of this - the space in which thoughts, feelings, selves appear and disappear. 

Our transient Anthropocene era is a brief moment in the vast history of this planet and the cosmos. The disappearance of our human species as we know it is a certainty, a transition either to extinction or to a further evolved trans-human form. Understanding and accepting this can be a source of serenity that enables us to live fully in the present moment as grateful witnesses to what is unfolding.