Porges (2023) — The vagal paradox: A polyvagal solution
The wiki’s first first-hand Porges source. polyvagal-theory had been held “at one remove” since the Payne et al. (2015) ingest — read only as Somatic Experiencing deployed it. This is Porges stating the theory in his own words, thirty years on, explicitly “to clarify the theory and rectify potential misunderstandings.” It arrives paired with its refutation (Grossman 2023), so the wiki meets PVT and the case against it in the same ingest — see is-polyvagal-theory-valid.
A one-page corrigendum (Porges 2024, Compr. Psychoneuroendocrinology 18:100233) clarifies that the paper’s two references to Grossman & Taylor “paraphrasing” PVT are “not an allegation of plagiarism or any similar act.” It is recorded against this study rather than as a separate page.
The paradox, and the solution
Two literatures disagree about the vagus. One says vagal cardiac tone — indexed by RSA — is protective, “anti-stress,” and predicts health. The other says vagal mechanisms cause life-threatening bradycardia and apnea (and, prolonged, neurogenic death). The paradox surfaced clinically in the neonatal intensive care unit: preterm infants with low RSA were the ones prone to lethal bradycardia. How can the vagus be both?
Porges’s answer is anatomical duality. Cardioinhibitory vagal fibres arise from two brainstem nuclei:
| ventral vagus (nucleus ambiguus) | dorsal vagus (DMNX) | |
|---|---|---|
| myelination | myelinated | mostly unmyelinated |
| signature | respiratory rhythm → RSA, the “vagal brake” | no respiratory rhythm |
| function (PVT) | calm, social engagement, homeostasis | bradycardia/apnea (immature/compromised), inotropic (contractility) effects, gut |
| evolutionary status (PVT) | mammalian repurposing | ancient, “reptilian” |
The vagus is poly-vagal because it contains these two distinct efferent pathways. This is the load-bearing claim, and it is exactly the claim Grossman says the evidence has falsified (the nucleus ambiguus does essentially all cardiac vagal control; the DMNX does almost none).
The five principles
Restated verbatim as the theory’s spine (Table 1): (1) autonomic state as an intervening variable — Porges’s methodological complaint that correlational science misses the mediating ANS; (2) three phylogenetically ordered circuits — dorsal vagal, then sympathetic, then ventral vagal, mapped to safe/dangerous/life-threatening; (3) dissolution — under challenge the newer circuits disinhibit older ones (“evolution/development in reverse”), the Jacksonian principle extended to brainstem autonomic control; (4) the ventral vagal complex / social engagement system — cranial nerves V, VII, IX, X, XI coordinating suck–swallow–breathe–vocalize, the neuroanatomical substrate of co-regulation; (5) neuroception — reflexive, pre-conscious detection of risk and safety.
What connects it to this wiki
- Neuroception’s bottom-up limb is interoception. Porges: autonomic reactions “send sensory information regarding bodily feelings to the brain where they are interpreted and consciously felt… the bottom-up limb of neuroception is functionally equivalent to interoception.” The theory’s felt-safety/felt-threat states are interoceptive states. See neuroception, respiratory-interoception.
- Vagal efficiency lands on existing pages. VE is reported low in joint hypermobility (already a wiki concept, via Bonaz) and in functional abdominal pain, and mediates the maltreatment→symptom link — the wiki’s third independent route to early adversity shaping autonomic/interoceptive competence.
- The RSA = vagal tone equation the theory rests on is the pivot of the dispute; it gets its own page at respiratory-sinus-arrhythmia.
- tonic-immobility — the dorsal-vagal shutdown SE borrows from PVT — is now readable against Grossman’s evidence that freezing-associated bradycardia in mammals is ventrally (NA) mediated, not dorsal.
How to read it
A theory-clarification, not a data paper: it advances no new experiment and concedes that human dorsal-vagal chronotropic function “is still speculative.” Its rhetorical structure — critics commit a “strawman,” and studies that never mention PVT are implicitly testing it — makes the theory hard to disconfirm on its own terms, which is precisely Grossman’s and the falsifiability worry in is-polyvagal-theory-valid. Held as the authoritative primary statement of a widely-adopted (15,000+ citations; thousands of “polyvagal-informed” therapists) but contested framework, read first-hand at last.