Polyvagal-Informed Therapy vs Somatic Experiencing
A side-by-side comparison: mechanism, evidence, the conditions each treats, philosophical roots, and where they actually disagree clinically.
At a glance
Polyvagal-Informed Therapy
- Tradition
- Somatic
- Founder
- Porges / Dana (2011)
- Evidence
- Emerging evidence
- Focus
- Somatic + Relational
- Format
- Individual
- Duration
- Framework
Somatic Experiencing
- Tradition
- Somatic
- Founder
- Peter Levine (1997)
- Evidence
- RCT-supported
- Focus
- Somatic + Experiential
- Format
- Individual
- Duration
- Medium-term
How they work
Polyvagal-Informed Therapy
Core mechanism: Identifying autonomic state (ventral/sympathetic/dorsal) + co-regulation with therapist + building ventral vagal capacity
Ontology: Trauma disrupts autonomic regulation; neuroception of danger keeps nervous system in defensive states
Somatic Experiencing
Core mechanism: Titrated pendulation between activation and resource states completes truncated survival responses trapped in the body
Ontology: Incomplete defensive responses (fight/flight/freeze) remain bound in the nervous system as undischarged survival energy
Conditions treated
3 shared · 1 Polyvagal-Informed Therapy-only · 3 Somatic Experiencing-only
Both treat
Only Polyvagal-Informed Therapy
Only Somatic Experiencing
What each assumes — and misses
Polyvagal-Informed Therapy
Philosophical roots: Porges (polyvagal theory); Darwin (emotional expression); Merleau-Ponty (body-subject); Dana (clinical application); Levine (somatic trauma)
Blind spots: Underlying theory scientifically contested; clinical applications extrapolate beyond evidence; not a standalone protocol
Therapeutic voice: That shutdown feeling — that's your nervous system protecting you. It makes sense. Let's see if we can find a little more safety right now.
Somatic Experiencing
Philosophical roots: Reich/Lowen (body holds defense — Levine studied with both); Merleau-Ponty (lived body); Darwin (survival instincts); ethology (Tinbergen, Lorenz — animal defensive responses); James-Lange (emotion as bodily process)
Blind spots: Risk of over-physiologizing psychological meaning; limited manualization makes research difficult; can be vague in application
Therapeutic voice: Where in your body do you feel that right now? Just notice, without trying to change it.
Choosing between them
Polyvagal-Informed Therapy and Somatic Experiencing both sit within the Somatic tradition — they share a worldview about what suffering is and how change happens. Differences are more often about technique and emphasis than about underlying theory.
For deeper coverage: see the full Polyvagal-Informed Therapy and Somatic Experiencing pages, or use the interactive comparison tool to add more modalities to this comparison.