Adaptive information processing (AIP) model, explained

The Adaptive Information Processing (AIP) model is EMDR’s core theory. It holds that your brain has a built-in system for filing new experiences into memory. Overwhelming experiences can disrupt that system, leaving a memory stored in a raw, “stuck” form instead of settling normally. EMDR’s phases and bilateral stimulation are built to help that stuck memory finish processing.

What does the AIP model actually say?

Francine Shapiro, the psychologist who developed EMDR, proposed the AIP model as the theory behind why it works. Per EMDRIA, the EMDR International Association, the model assumes your brain has a natural system for processing new experiences. It links each one into your existing memory, much like a cut mending on its own.

A 2017 paper in Frontiers in Psychology by Hase and colleagues describes what happens when that system gets overwhelmed. The experience gets stored in a raw form instead of being fully processed. It keeps its original images, body sensations, and beliefs, rather than settling into ordinary memory.

How does this explain patterns that show up today?

AIP theory frames these stuck memories as the root of many present-day reactions. A trigger, a harsh self-belief, or a body sensation can all trace back to one experience that was never fully processed. It’s the theory behind EMDR’s use for PTSD: a mind still holding onto old danger.

That root material can reach back to childhood or to something more recent, but AIP views it as one connected system. Settling today’s smaller triggers is real work on that system, from the reachable edges inward.

How does bilateral stimulation fit into the model?

Per the AIP model, bilateral stimulation, eye movements, tones, or taps, is the piece that helps a stuck memory reconnect. It links back up with more adaptive information already in the brain. This happens during the desensitization, installation, and body scan phases of EMDR, while the memory is briefly held in mind. The whole sequence is called reprocessing.

Is the AIP model scientifically proven?

It’s a well-established clinical framework, not settled neuroscience. A 2020 review in the Journal of Evidence-Based Social Work traces its principles and evidence across decades of EMDR practice and research.

But a 2024 narrative review in Frontiers in Psychiatry notes that researchers are still testing which mechanisms explain why reprocessing works. They’re also weighing AIP against newer, complementary models. Think of it as EMDR’s working theory: useful, and still being refined.

Can you use this outside therapy?

The AIP model itself is a therapist’s framework, not a self-help checklist. Choosing which touchstone memory to reprocess takes trained judgment.

What you can practice on your own is the ingredient the model explains: bilateral stimulation. It’s a wellness technique for everyday stress, not a stand-in for deep trauma work. EmEase, a self-guided EMDR app, offers that guided practice at app.emease.com.