A framework developed by Stephen Porges that expanded the understanding of vagal function to include a ventral vagal branch (social engagement), sympathetic activation (fight-or-flight), and dorsal vagal shutdown (freeze). Foundational to modern trauma therapy.
Polyvagal theory was developed by Stephen Porges in the 1990s and expanded the understanding of vagal function beyond the classic "rest-and-digest" framing. The theory identifies three autonomic states with distinct evolutionary origins:
Ventral vagal: the most evolutionarily recent. Active during social engagement, safety, connection. Mediates facial expression, voice tone, and the social engagement system. Slow steady heart rate, easy breathing, full attention.
Sympathetic: the fight-or-flight state. Active under perceived threat. Rapid heart rate, shallow breathing, narrowed attention, mobilisation for action.
Dorsal vagal: the most evolutionarily ancient. Active under inescapable threat or overwhelm. Produces shutdown, freeze, dissociation, low heart rate, immobilisation. The "playing dead" response.
The theory's central insight: trauma typically involves dorsal vagal shutdown, which mainstream stress-response models did not adequately capture. Patients with trauma history often present with dissociation, numbing, fatigue, and disconnection rather than (or alongside) the classic anxiety/hyperarousal symptoms.
Clinical implications: trauma therapy needs to address all three states, not just sympathetic activation. Building ventral vagal capacity (through co-regulation with safe others, prosocial engagement, vocal/facial work) is foundational. Down-regulating sympathetic without addressing dorsal vagal can produce shutdown rather than safety.
The theory has become foundational to trauma-informed therapy, somatic experiencing, trauma-informed yoga, and many body-based modalities. The framework has critics within neuroscience research (some specific physiological claims have been challenged) but the clinical application has demonstrated strong utility regardless.
For body-based work: polyvagal-aware practitioners attend to the patient's autonomic state across all three branches and adjust the protocol accordingly. A patient in dorsal vagal shutdown needs different intervention than a patient in sympathetic activation.
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