Polyvagal Theory Is Being Challenged… What Play Therapists Need to Know

How to think critically about the polyvagal debate without abandoning what still helps your clients

If you’ve spent any time in the trauma-informed, play therapy, or nervous system regulation world, chances are you’ve heard the buzz:

“Is polyvagal theory being debunked?”

Or maybe the more dramatic version:

“Is polyvagal theory dead?”

For many play therapists, this conversation can feel unsettling.

After all, polyvagal theory has become deeply woven into how many clinicians understand:

Fight, flight, freeze
Co-regulation
Nervous system states
Safety cues
Trauma responses

So when neuroscientists begin publicly challenging parts of the theory, it can create a lot of uncertainty.

Are we teaching the wrong thing?

Should we stop using polyvagal language?

Does this mean everything we’ve been applying clinically is flawed?

Not exactly.

This week’s episode of Next Level Play Therapy tackles an important and nuanced conversation:

Some components of polyvagal theory are being disputed—but that does not mean everything helpful about nervous system-informed practice disappears.

First: Why This Debate Matters for Play Therapists

As clinicians, most of us are not neuroscientists.

We are practitioners.

Our job is to take theory, research, and evolving science and apply it in ways that actually help children, adolescents, and families heal.

That means we often rely on experts to simplify highly complex neuroscience into usable concepts.

Polyvagal theory, developed by Stephen Porges, has been one of the most influential frameworks for doing exactly that.

It gave many therapists language for understanding:

Why children shut down
Why connection matters
Why safety is essential
Why co-regulation changes outcomes

And for many play therapists, it helped bridge the gap between neuroscience and practical intervention.

But here’s the important part:

Simplified clinical models can be useful and still require updating as science evolves.

That is exactly where we are right now.

What Polyvagal Theory Originally Proposed

At its core, polyvagal theory suggests the autonomic nervous system operates through a hierarchical system:

According to the traditional model:

Ventral Vagal State:

Social engagement, connection, safety, regulation

Sympathetic State:

Fight or flight, mobilization, survival

Dorsal Vagal State:

Shutdown, immobilization, freeze, collapse

This framework has been incredibly clinically useful because it helps explain why clients may move between connection, activation, and shutdown.

Polyvagal theory also introduced concepts like:

Neuroception:

The brain/body’s subconscious scanning for danger or safety

Co-Regulation:

The idea that nervous systems regulate through safe relationships

These concepts became especially influential in play therapy, attachment work, and trauma-informed care.

So What’s Being Challenged?

This is where nuance matters.

The current critiques are not necessarily arguing that nervous system states, safety, or co-regulation are false.

Instead, neuroscientists are primarily challenging specific anatomical and evolutionary claims within polyvagal theory.

Key critiques include:

1. The evolutionary hierarchy may be oversimplified

Some researchers argue the nervous system does not operate in such a rigid, stepwise evolutionary order.

2. The vagus nerve’s role may be overstated or inaccurately explained

Critics suggest the vagus nerve may function more as a communication highway than a singular driver of social engagement.

3. The neuroanatomy may be more complex than the theory presents

The nervous system is highly integrated, involving brain structures, prediction systems, past experiences, and multiple pathways—not just a strict three-tier hierarchy.

In other words:

The critiques are less about whether regulation matters and more about whether the underlying explanations are scientifically precise.

What Still Holds True (And Why This Matters Clinically)

This is where many play therapists can exhale.

Even among critics, several core ideas remain widely supported:

Safety Still Matters

Children function better when they feel safe.

This remains foundational.

A dysregulated child cannot consistently access higher-level thinking, relational trust, or therapeutic flexibility without enough safety.

Co-Regulation Still Matters

Healthy, regulated relationships still support nervous system development.

This is huge for play therapists.

Your presence matters.

Your tone matters.

Your ability to stay grounded matters.

The Body and Brain Are Connected

Breathing, movement, rhythm, sensory interventions, and somatic strategies still help regulate stress systems.

This means many practical interventions used in play therapy remain clinically valuable.

Trauma Still Impacts Nervous System Responses

Children with trauma histories may still shift quickly into survival states based on prior experiences, beliefs, and learned patterns.

What may change is how precisely we explain why this happens.

The Bigger Shift: We Need to Include the Brain More Fully

One of the most important takeaways from this debate is this:

Nervous system responses are not just about the vagus nerve—they also involve the brain’s predictive processes.

This means:

The brain is constantly making predictions based on:

Past experiences
Trauma history
Attachment experiences
Beliefs
Environmental cues

Then it activates responses based on what it predicts is necessary for survival.

For play therapists, this is powerful.

Because now we are not just asking:

“What state is this child in?”

We are also asking:

“What meaning has this child made that is activating this state?”

That opens the door to deeper case conceptualization.

What This Means for Play Therapy

This debate does not mean you need to throw out everything.

It means you may need to refine your lens.

Instead of:

“Your child is in dorsal vagal shutdown.”

Consider:

“Your child’s nervous system may be moving into shutdown based on perceived threat, past experiences, and current brain-body predictions.”

Instead of:

“We just need regulation.”

Consider:

“We need regulation and we need to understand the beliefs, developmental factors, attachment experiences, and emotional meanings driving dysregulation.”

This creates a more comprehensive, developmentally sensitive approach.

And honestly?

That aligns beautifully with integrative play therapy already.

How This Helps Parents

One of the most practical applications of this updated understanding is parent education.

Parents often feel overwhelmed by big behaviors.

When we help them understand:

Their child’s brain is developing
Their child’s nervous system is learning
Co-regulation shapes future self-regulation
Their calm presence can help shift the child’s system

…we empower them.

This is where attachment, neuroscience, and play therapy still work incredibly well together.

You do not need outdated oversimplifications to teach this effectively.

You just need accurate, evolving understanding.

A Practical Reminder for Play Therapists

You do not need to become a neuroscientist.

But you do need to remain curious.

This means:

Stay updated
Read critically
Avoid oversimplified “Instagram neuroscience”
Seek consultation
Be willing to refine your language

Because ethical play therapists do not just repeat popular frameworks.

They adapt as knowledge grows.

Final Thought: Polyvagal Theory May Be Challenged… But Critical Thinking Is Healthy

Scientific debate does not automatically mean something is useless.

It means we are learning.

The real takeaway is not panic.

It’s precision.

Polyvagal theory may still offer clinically useful concepts—but as play therapists, we want to make sure we are using frameworks responsibly, accurately, and flexibly.

So rather than asking:

“Is polyvagal theory dead?”

A better question may be:

“How do I continue using what helps while staying aligned with evolving science?”

That question will likely serve your clients far better.

Want to Go Deeper?

Healing Trauma Through Play Therapy: A Neuroscience and Attachment Approach

My upcoming June training explores updated neuroscience, attachment, trauma conceptualization, and practical play therapy application for working with traumatized children.