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: As theorized by its developer and not yet tested: cannabis or ketamine induces a primary consciousness state + active therapist relational engagement with the somatic defense cascade + completion of truncated survival responses is said to reorganize autonomic patterning. No link in that chain has been examined outside the training institute's own materials.
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: Alternating in small doses between activation and a settled resource state ('pendulation') is held to complete defensive responses that were interrupted at the time of the threat and remain bound 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; requires the therapist to have their own embodied practice training and is not safely improvised without it; 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: You just turned your head away from me. Don't correct it, let the movement keep going. Where does it want to take you? I'm not going anywhere, and I'd like you to keep coming back to my face while it happens.
Somatic Experiencing
Philosophical roots: Reich/Lowen (body holds defense; Levine worked in this lineage but did not study with Reich, who died in 1957); 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: Let's leave that where it is for a moment and come back to your feet on the floor. When you're ready we'll go back and take a smaller piece of 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.