PSIP 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
PSIP
- Tradition
- Psychedelic
- Founder
- Saj Razvi (2016)
- Evidence
- Emerging evidence
- Focus
- Experiential + Somatic
- Format
- Individual
- Duration
- Medium-term
Somatic Experiencing
- Tradition
- Somatic
- Founder
- Peter Levine (1997)
- Evidence
- RCT-supported
- Focus
- Somatic + Experiential
- Format
- Individual
- Duration
- Medium-term
How they work
PSIP
Core mechanism: Cannabis or ketamine induces primary consciousness state + active therapist relational engagement with somatic defense cascade + completion of truncated survival responses reorganizes autonomic patterning
Ontology: Complex trauma is stored in autonomic nervous system defense patterns inaccessible to ordinary consciousness; psychedelic medicine provides access while relational attunement provides corrective experience
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
2 shared · 2 PSIP-only · 4 Somatic Experiencing-only
Both treat
Only PSIP
Only Somatic Experiencing
What each assumes — and misses
PSIP
Philosophical roots: Merleau-Ponty (embodied consciousness); Porges (polyvagal theory — autonomic defense states); Levine (somatic experiencing — completing survival responses); van der Kolk (body keeps the score); Bowlby (attachment as organizing principle); psychodynamic transference theory
Blind spots: No controlled outcome research; proprietary training model without external accreditation; reliance on cannabis as primary medicine complicates legal and clinical standards; apprenticeship structure creates potential dual-relationship concerns; strong theoretical claims outpace empirical evidence
Therapeutic voice: I'm right here with you. What's happening in your body right now? Stay with that — I'll stay with you.
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
PSIP (Psychedelic) and Somatic Experiencing (Somatic) come from different traditions, which means they assume different things about what a person is, what causes suffering, and what the therapeutic relationship is for. The choice between them is often less about "which works better" and more about which set of assumptions fits the client and the therapist.
For deeper coverage: see the full PSIP and Somatic Experiencing pages, or use the interactive comparison tool to add more modalities to this comparison.