HoldsUp

Stephen Porges

Stephen Porges is a neuroscientist and psychologist known for developing Polyvagal Theory. His research focuses on autonomic nervous system regulation, brain-body connections such as the brain-heart axis, and the physiological underpinnings of psychological safety. He also investigates the impacts of trauma and adversity on autonomic function, as well as the development and clinical application of interventions related to Polyvagal Theory.

25 claims checked on air: 2 context 3 contradicted 16 supported 4 unverified

What they said on air - contradicted

2 citing their own research

0:16:18contradictedhighPolyvagal Theory: Why You Feel So Anxious All The Time - Dr

Mammals possess a dual vagal system consisting of an evolutionarily older dorsal vagal system regulating internal organs and a newer ventral vagal system linked to facial and vocal muscles.

"The mammal basically had not only a fight-flight system and not only an older dorsal, the back of the brain vagal system that regulated your organs, but also had this newer ventral vagal that was locked to our voice and the muscles of our face and head." (said at 0:16:18)

The speaker's claim restates a core premise of Stephen Porges's Polyvagal Theory, which posits that mammals uniquely evolved a dual vagal system—a newer ventral vagal system connected to facial/vocal muscles and social engagement, alongside an older dorsal vagal system regulating internal organs. However, systematic evaluations of comparative neuroanatomy and autonomic neurophysiology demonstrate that this proposed evolutionary sequence and anatomical segregation are unsupported and contradicted by the broader scientific evidence.

0:52:53contradictedhighPolyvagal Theory: Why You Feel So Anxious All The Time - Dr

Stephen Porges was the first person to quantify heart rate variability in 1969.

"actually what you don't know is that in the '60s I was the first person to quantify heart rate variability." (said at 0:52:53)

The claim that Stephen Porges was the first person to quantify heart rate variability (HRV) in 1969 is contradicted by historical records of physiological research. Respiratory sinus arrhythmia (RSA) and changes in heart rate variability were first recorded as early as 1847 by Carl Ludwig, and quantitative measurements of beat-to-beat cardiac variations were conducted long before 1969 (Billman, 2011). While Porges developed specific signal-processing methods for quantifying vagal tone and HRV in psychophysiology later in his career, he was not the first person to quantify heart rate variability.

1:45:27contradictedhighPolyvagal Theory: Why You Feel So Anxious All The Time - Dr

Although the nucleus from which the ventral vagus originates predates mammals, it did not possess cardioinhibitory fibers until mammals evolved.

"the fact that it the nucleus that where the vagus comes from in the ventral vagus is an older nucleus long before mammals is fine, but that didn't have cardioinhibitory fibers until mammals had it." (said at 1:45:27)

The claim that the brainstem nucleus associated with the ventral vagus (the nucleus ambiguus or ventral motor column) lacked cardioinhibitory fibers prior to mammalian evolution is a core premise of the polyvagal theory that is contradicted by comparative neuroanatomy and physiology. Studies in non-mammalian vertebrates—including cartilaginous fish (elasmobranchs), teleosts, amphibians, and reptiles—demonstrate that cardiac vagal preganglionic neurons mediating cardioinhibition originate from both dorsal and ventrolateral/ambiguus motor nuclei and provide functional vagal regulation of heart rate. Expert consensus evaluations of the evolutionary and neuroanatomical claims of the polyvagal theory show that ventral vagal cardioinhibitory projections and cardiorespiratory interactions predate mammals by hundreds of millions of years.

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