Polyvagal Theory in Therapy Sessions: A Practical Clinical Guide
By Kristen McClure, MSW, LCSW | TherapistWorksheet.com
You’ve probably heard “polyvagal” more in the last five years than in the previous fifteen combined. It’s in supervision, in trainings, in client handouts. And it’s genuinely useful — Stephen Porges’s work on the autonomic nervous system gives us a framework for understanding why clients do what they do physiologically, in ways that traditional talk therapy models simply don’t account for.
But there’s a gap between understanding polyvagal theory and knowing what to actually do with it in session. This post is about that gap.
The Three States in Plain Language
Polyvagal theory describes three adaptive responses your nervous system has to the world. Your clients’ nervous systems cycle through these — sometimes within a single session.
Ventral Vagal: The Green Zone
This is the state of social safety. The client is present, making contact, can move between thinking and feeling. Humor is possible. Repair after misattunement is possible. This is the state where real therapy happens.
What you’re looking for: Eye contact, vocal prosody (warmth and variation in voice), engagement, flexibility.
Sympathetic Activation: The Red Zone
The alarm system is online. The client is mobilized — for fight or for flight.
Fight looks like: Irritability, argument, challenge, defensiveness. The jaw may be tight, body forward, voice harder.
Flight looks like: Topic-jumping, humor as deflection, checking the phone, feeling like they’re not quite here. Cancellations often cluster in flight activation.
Dorsal Vagal: The Blue Zone
Shutdown. The system has determined that fight and flight won’t work, so it collapses.
What you’re looking for: Flat voice, monotone quality, eyes glazing, very slowed responses, “I don’t know” to everything. The tricky thing: dorsal shutdown can look like calm. This is a common misread.
What You’re Actually Doing in the Room
Your nervous system is in that room too. Your clients aren’t responding to your words as much as they’re responding to your physiological state. Your breathing rate. Your facial muscle tone. The prosody of your voice. Whether you’re genuinely curious or subtly anxious.
This is co-regulation — and it’s the mechanism underneath all the techniques. A therapist who is grounded and regulated offers clients something to borrow.
In session, when a client is activated: slow your speech, lower your voice, let your face soften. Not dramatically — just slightly. Their nervous system will pick it up before their cognitive mind does.
Recognizing State Shifts in Real Time
- Voice suddenly flattens: Ventral to dorsal. Something just shut down.
- Eyes go distant mid-sentence: Entering dorsal or dissociation. The person left the room a little.
- Jaw tightens, shoulders rise: Ventral to sympathetic. The alarm just went off.
- Laughter at the wrong moment: May be flight — moving away from the activation through humor.
- Tears stop abruptly: May have collapsed into dorsal to stop the feeling.
Scripts for Each State
For sympathetic activation:
“Your system is really working right now. That makes sense. Can we slow down together for just a moment?”
“I’m going to lower my voice a little — not because you’re doing anything wrong, but because it might help.”
For dorsal collapse:
“It looks like something got really heavy just now. I’m right here.”
“Can you feel your feet? Can you come back into the room with me for a second?”
For welcoming someone back to ventral:
“Take your time. I’m not going anywhere.”
The Common Misread: Calm Doesn’t Always Mean Regulated
The most clinically important thing in polyvagal work: dorsal shutdown looks like calm. The client who comes in, sits quietly, answers your questions pleasantly, and doesn’t seem to be struggling — that client may be in profound dorsal collapse.
Check for aliveness, not just absence of distress. Is there warmth in the eyes? Prosody in the voice? Genuine contact? Or is there a quality of flatness that’s been there for weeks and you’ve been interpreting as “doing better”?
The Full Clinical Reference
The Polyvagal Quick Reference Cheat Sheet pulls all of this into one page you can use in session prep or keep on your desk:
- All three states with full behavioral descriptions
- State shift signals to watch for in real time
- Interventions that work for each state (and what to avoid)
- A note on co-regulation and your own nervous system
- Scripted language for each state
- A common misreads table
Get the Polyvagal Quick Reference — $6.99 on Payhip →
Frequently Asked Questions
Do I need to explain polyvagal theory to my clients?
Often, yes — in simplified form. The framework gives clients language for their own experience that reduces shame (“my nervous system is activated” lands differently than “I’m a mess”). But tailor the depth to the client.
Is polyvagal theory fully evidence-based?
Porges’s work is well-supported in the neuroscience literature, though some specific clinical claims are ahead of the research. The basic framework — three states, co-regulation, the role of the social engagement system — has good support.
What if I’m dysregulated before a session?
Do something. A few minutes of deliberate slow breathing, a brief walk, a grounding practice. Your client’s system will read you from the moment you walk in. Getting yourself into ventral is clinical preparation.
Can clients learn to self-regulate using polyvagal principles?
Yes — and this is often a meaningful part of treatment. Helping clients recognize their own state shifts and access tools that support state change is concrete, practical work that doesn’t require extensive insight.
Kristen McClure, MSW, LCSW is a licensed therapist who creates practical clinical tools to help therapists navigate the hardest moments in their work.
Browse the full library at TherapistWorksheet.com →
Sources: Porges, S.W. (2011). The Polyvagal Theory. Dana, D. (2018). The Polyvagal Theory in Therapy.