Which Came First: EMDR or Somatic Experiencing - and Why Do They Feel So Similar?

For anyone working in trauma therapy today, it’s almost impossible not to notice how much overlap exists between EMDR and Somatic Experiencing (SE). The language may differ, the techniques may look distinct, and the pace certainly varies, but the underlying mechanisms often feel strikingly familiar.

Clients notice it.
Therapists notice it.
And if you’ve trained in both approaches (or integrate somatic thinking into EMDR), you can feel the parallels in your bones.

So where did these similarities come from? And is it “just you,” or are EMDR and SE truly part of the same therapeutic lineage?

Let’s dive in.

The Timeline: SE Came First

Although both modalities are now central pillars in trauma treatment, they didn’t emerge at the same time.

• Somatic Experiencing (SE) was developed by Dr. Peter Levine beginning in the 1970s, with his major texts published throughout the 80s and 90s.

• EMDR was developed later by Dr. Francine Shapiro, with the first study published in 1989.

So chronologically, SE predates EMDR by around a decade.

But what’s more interesting is why their development began and why they ended up looking so similar.

A Shared Root: The “Bottom-Up Revolution”

Both Shapiro and Levine emerged during a period when trauma researchers were finally beginning to understand something crucial:

Trauma isn’t stored only in our thoughts.
Trauma is stored in the body and the nervous system.

This shift in the 1970s and 80s fundamentally changed the landscape. Theories of trauma began to include:

• Implicit memory

• Autonomic nervous system dysregulation

• Freeze responses

• Body-based survival patterns

Both EMDR and SE grew from this same scientific movement.

In this sense, they weren’t developed in isolation; they were shaped by the same evolving understanding of how humans survive overwhelming threat.

Why Do EMDR and SE Overlap So Much?

1. They share the same biological principles

Even before Polyvagal Theory was published (1994), both Levine and Shapiro were observing the same survival patterns:

• Fight/flight

• Freeze/collapse

• Orienting responses

• The body’s attempt to complete a thwarted defensive action

• The need for co-regulation

When different clinicians observe the same physiology, they often create therapies that rhyme with each other.

2. Both rely on dual attention / dual awareness

The terms differ:

• SE calls it pendulation

• EMDR calls it dual attention stimulation

But both are doing the same thing:
Help the nervous system move safely between activation and regulation so it can metabolise what was previously overwhelming.

3. Both complete stuck survival energy

• SE does this explicitly through movement, titration and micro-completions.

• EMDR often does this implicitly through bilateral stimulation, allowing the body to reorganise itself spontaneously.

If you’ve ever done EMDR and suddenly watched a client’s fist clench, their legs kick, or their torso turn in a protective movement, that’s SE’s territory happening within EMDR’s frame.

4. Both focus on bottom-up processing

Neither approach relies primarily on talking or cognitive reframing.

Healing comes from:

• Sensation

• Movement

• Implicit memory

• The body’s natural drive to complete what was once interrupted

This is why both EMDR and SE can be so effective for complex trauma, neurodiversity, functional disorders and early-life wounds.

So What’s Actually Different?

EMDR

• More structured

• Memory-focused

• Faster

• Uses bilateral stimulation to accelerate processing

• Organised around the Adaptive Information Processing (AIP) model

Somatic Experiencing

• Slower

• Physiological tracking led

• Highly titrated

• Focuses on completing defensive responses

• Less protocol, more organic unfolding

Both approaches lead to profound shifts. They simply use different routes to reach the same internal destination.

Why EMDR Can Feel Like “Somatic Experiencing, But (much)Faster”

This is a common experience for therapists trained in both modalities.

EMDR tends to move through activation, completion and integration cycles more quickly because:

• The bilateral stimulation accelerates nervous-system processing

• The structure contains the work tightly

• Targeting a memory hooks into an entire associative network

SE does all of this too-just in gentler, slower, more titrated waves.

Neither is better. They simply reflect different philosophies of pace and containment.

The Overlap Is a Strength, Not an Accident

Clients benefit enormously when therapists integrate the best of both worlds:

• SE skills help stabilise, regulate and prevent flooding.

• EMDR protocols guide reprocessing efficiently and safely.

• Somatic tracking within EMDR improves outcomes for dissociation, FND and neurodiversity.

• EMDR’s structure supports clients who struggle with ambiguity or unstructured somatic work.

The therapies complement each other because they were born from the same scientific roots.

Final Thoughts

Somatic Experiencing may have come first, but EMDR grew from the same understanding of trauma as a physiological, survival-based experience. The similarities aren’t a coincidence, they reflect the nervous system’s universal blueprint for healing.

Both modalities work because they cooperate with the body’s natural drive toward completion, coherence and connection.

And when therapists understand the overlap, the work becomes:

• Safer

• More attuned

• More effective

• More responsive to individual nervous systems