Which has stronger evidence, IPNB or Lifespan Integration?

IPNB is emerging evidence; Lifespan Integration is emerging evidence.

IPNB vs Lifespan Integration

Q: What's the difference between IPNB and Lifespan Integration?

IPNB works by Integration across neural networks (bilateral, vertical, temporal) through attuned relationship; expanding window of tolerance Lifespan Integration, by contrast, works by Repeated chronological review of life memories allows the nervous system to integrate traumatic experience into the larger temporal context of a whole life, shifting implicit body-level beliefs about safety and self IPNB sits within the Integrative tradition; Lifespan Integration sits within the Trauma-Focused tradition.

A side-by-side comparison: mechanism, evidence, the conditions each treats, philosophical roots, and where they actually disagree clinically.

At a glance

IPNB

Tradition: Integrative
Founder: Daniel Siegel (1999)
Evidence: Emerging evidence
Focus: Framework
Format: Individual
Duration: Framework

Lifespan Integration

Tradition: Trauma-Focused
Founder: Peggy Pace (2003)
Evidence: Emerging evidence
Focus: Relational + Somatic + Integrative
Format: Individual
Duration: Medium-term (12-30 sessions typical)

How they work

IPNB

Core mechanism: Integration across neural networks (bilateral, vertical, temporal) through attuned relationship; expanding window of tolerance

Ontology: Impaired neural integration from relational/developmental experience; integration = mental health

Lifespan Integration

Core mechanism: Repeated chronological review of life memories allows the nervous system to integrate traumatic experience into the larger temporal context of a whole life, shifting implicit body-level beliefs about safety and self

Ontology: Fragmented temporal integration — the self is stuck in past time, experiencing old threat as present. The body has not updated its felt sense of when it is.

Conditions treated

0 shared · 2 IPNB-only · 4 Lifespan Integration-only

Only IPNB

Complex Trauma / Developmental Trauma Attachment & Relational Patterns

Only Lifespan Integration

PTSD & Acute Trauma Dissociative Disorders Anxiety Disorders Depression & Mood Disorders

What each assumes — and misses

IPNB

Philosophical roots: Siegel (interpersonal neurobiology); complexity theory (emergence, integration); Hebb (neurons that fire together); Bowlby (attachment shapes brain); Buddhism (mindfulness integration)

Blind spots: Framework too broad to test empirically; integration language can become vague; not a clinical method itself

Therapeutic voice: When you can name the feeling, you can tame the feeling. Let's try: what would you call this state?

Lifespan Integration

Philosophical roots: Siegel (interpersonal neurobiology — neural integration across time); van der Kolk (the body keeps the score — implicit memory); Schore (affect regulation and repair of early attachment); Bowlby (internal working models); Janet (dissociation as temporal fragmentation)

Blind spots: Limited controlled research base; mechanism of action not well understood neuroscientifically; can be over-applied to presentations that need more stabilization first; rapid pace of timeline repetitions may overwhelm some dissociative clients

Therapeutic voice: We're going to go through your timeline again. Just let the images come — you don't need to narrate or analyze them. Your body knows how to do this.

Choosing between them

IPNB (Integrative) and Lifespan Integration (Trauma-Focused) 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 IPNB and Lifespan Integration pages, or use the interactive comparison tool to add more modalities to this comparison.