Polyvagal Theory

At a glance

Developed by Stephen Porges, Polyvagal Theory proposes a three-tiered model of the autonomic nervous system — social engagement, fight-or-flight mobilisation, and immobilisation/shutdown — and has become hugely influential in trauma-informed therapy, popularising terms like “freeze”, “window of tolerance”, and “co-regulation.”

Evidence status — named directly

This is one of the most clinically popular and most scientifically contested frameworks in this entire section. Its clinical language (freeze responses, co-regulation, a “window of tolerance”) is widely used and can be genuinely useful, descriptively. Some of its more specific physiological claims — particularly around the evolutionary and neuroanatomical specifics of vagal pathways — have been directly challenged by physiologists and are not settled science. Treat the clinical vocabulary as useful, and the specific mechanistic claims as contested, not established.

The disability question

Polyvagal-informed practice sometimes reads visible stillness, low affect, or reduced movement as “shutdown” — which risks exactly the same error this whole section keeps naming: mistaking impairment, fatigue, or a different neurological presentation for a trauma response. A person’s actual, ongoing bodily presentation should never be assumed to indicate a nervous-system state without asking them directly what’s actually happening for them.

You may also want to explore

Somatic Experiencing · Fatigue, Rest & Embodiment · Evidence, Claims & Controversies