Stephen W. Porges is an American neuroscientist who developed the polyvagal theory, a model of the autonomic nervous system that describes three hierarchical neural circuits mediating behavioral and physiological responses to safety and threat. The theory identifies the ventral vagal complex (social engagement and safety), the sympathetic nervous system (mobilization and fight-or-flight), and the dorsal vagal complex (immobilization and shutdown) as phylogenetically ordered response systems.
Polyvagal theory has been influential in trauma treatment, somatic experiencing, and clinical approaches to autonomic dysregulation. The theory proposes that the nervous system continuously evaluates environmental risk through a process Porges calls neuroception — a subconscious detection of safety or danger that shapes autonomic state before conscious perception occurs.
The theory connects interoception to social behavior: vagal tone influences not just heart rate and breathing but the capacity for social engagement, vocal prosody, and facial expressiveness. This links autonomic regulation to relational capacity — a connection that informs both clinical practice and the vault’s work on relationality.
Notable works
- The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment, Communication, and Self-Regulation (2011)
- The Pocket Guide to the Polyvagal Theory (2017)
Related
- interoception — the sensory system polyvagal theory describes
- somatic experiencing — a trauma approach informed by polyvagal theory