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You ask what feels like a fairly neutral question. Nothing loaded. Nothing you have not asked a hundred times. And then you watch it happen in real time: one partner's face goes flat. Their voice drops to single syllables. Their gaze drifts somewhere to the left of your shoulder and stays there. The other partner's jaw tightens almost imperceptibly. Their breathing gets shorter. They sit forward just slightly in their chair.
You have been here before. You know what comes next if nothing shifts.
What most therapists recognize in that moment as the beginning of a cycle, not every therapist knows as a nervous system event. The flat face is not contempt. The shallow breathing is not drama. What just happened in your office had nothing to do with communication. It was two autonomic nervous systems detecting relational threat and responding with strategies they learned long before either of these people ever sat across from a therapist.
This post is about what stonewalling, flooding, and freeze actually are at the body level, why calling them communication problems is both clinically inaccurate and quietly harmful, and what you can say in the room to shift the frame before the session runs off the rails. It is also a preview of one of the core skills taught in the EMDR with Couples training: state tracking, which is the real-time practice of reading autonomic states in two people at once and letting that information drive your clinical decisions.
Every therapist who has sat with couples long enough has watched the communication skills approach fail. Not because the skills are wrong. Because the wrong problem was being addressed.
Stonewalling, in most clinical and popular frameworks, is described as emotional withdrawal. The partner who goes quiet, flat, monosyllabic, sometimes physically leaves. In Gottman's decades of laboratory research, it is coded as a behavioral shutdown, and in the popular literature it frequently lands as contempt-by-inaction, a power move, a punishing silence. The implicit message to the stonewalling partner: you are choosing not to engage. Try harder.
Flooding gets framed as the opposite. The partner who escalates, who cannot stop pursuing, whose voice gets louder, who "loses it." Emotional reactivity. Poor impulse control. Needs to learn to manage their feelings before they are ready for couples work.
Both descriptions share the same flaw: they describe what the behavior looks like from the outside. They say nothing about what is happening inside the person. And what is happening inside the person is the difference between a communication failure and a physiological event.
Gottman's research on physiological flooding established the threshold clearly: when heart rate exceeds 100 beats per minute, the capacity for coordinated, empathic communication becomes functionally impossible. Not difficult. Not unlikely. Impossible. This is not a metaphor. It is a measurable physiological state. When the nervous system crosses that line, asking a person to use active listening skills is like asking someone in the middle of a sprint to perform a delicate surgical procedure. The hardware is not available.
The same logic applies to the partner who shuts down. Dorsal vagal withdrawal, the evolutionary shutdown response, does not feel like a choice from the inside. It feels like collapse, like going underwater, like the lights dimming. Asking that partner to "use their words" is not just unhelpful. It is a neurologically impossible request.
These responses also do not exist in isolation. As we explored in Attachment Injuries in Couples Therapy, unresolved attachment wounds leave partners with a lower activation threshold. The nervous system that learned early that connection is dangerous, that proximity means pain, does not start from neutral in a couples session. It is already scanning. Already primed. The behavioral labels miss all of that.
You do not need to teach couples polyvagal theory. You do need to understand it well enough to see it operating in your room in real time.
The framework that matters most here is the three-state hierarchy described in Porges's polyvagal research. Think of it as a ladder with three rungs, and the nervous system moving up and down that ladder in response to perceived safety or threat. The direction of movement is not a choice. It is a response.
State 1: Ventral vagal (social engagement)
This is the regulated state. When both partners are here, facial musculature is relaxed and responsive. Prosody is normal, meaning tone of voice carries warmth and nuance. Listening is genuinely possible. Perspective-taking is accessible. This is the only state in which couples interventions can actually land. It is also, not coincidentally, the state that evaporates first when either partner's nervous system detects relational threat.
State 2: Sympathetic activation (fight or flight)
This is what flooding looks like from inside. Heart rate climbs. Breathing gets shallow and fast. Blood flow shifts toward the body's periphery and away from the prefrontal cortex, exactly the part of the brain responsible for empathy, perspective-taking, and nuanced language. Cortisol and adrenaline enter the picture. The body is mobilizing for a survival emergency.
The partner who is flooding is not being aggressive or dramatic. They are in a physiological emergency and their nervous system is increasing output to try to solve it. The problem, from the outside, is that they are the loud one. They look like the problem. They are actually a dysregulated nervous system doing the only thing sympathetic activation knows how to do: mobilize, pursue, escalate.
For a deeper look at how polyvagal science maps onto the three-state model in couples work, the research on autonomic hierarchy is worth reading alongside this clinical frame.
State 3: Dorsal vagal activation (freeze or shutdown)
This is what stonewalling looks like from inside. The dorsal vagal complex, the phylogenetically oldest branch of the vagus nerve, mediates shutdown when threat is perceived as inescapable or too overwhelming to mobilize against. Research on the physical effects of stonewalling found something counterintuitive: the stonewalling partner appears still, but there is increased muscle tension and elevated electrodermal activity under the surface. The body conserves output while remaining internally activated. Less movement, flattened affect, reduced vocal prosody, a gaze that goes somewhere else.
The partner in dorsal shutdown is not withholding. They are not punishing. They are, as our TTI resource on dorsal vagal shutdown describes, in a state of protective collapse. And the cruel irony: their shutdown reads to the flooded partner as contempt or abandonment, which escalates the flooded partner's activation, which deepens the shutdown. The cycle feeds itself.
The concept that ties all three states together is neuroception, a term from Porges's polyvagal framework: the nervous system's continuous, subconscious surveillance process that detects safety or threat before conscious thought has any input. Neither partner is deciding to be this way. Their nervous system detected something, evaluated it below the level of awareness, and responded. The decision was made before their prefrontal cortex got to vote.
There is a specific kind of harm that comes from well-intentioned but mislocated intervention. And in couples work with trauma histories, the mislocated intervention is almost always some version of: they need to communicate better.
When a couple is told their problem is communication, both partners hear something that is technically about skill but lands as character assessment. The flooded partner hears: you are too much. The shutdown partner hears: you are not enough. You are failing at this. Try harder. Use better tools. The reason the last eight sessions have not moved anything is that neither of you is doing the work correctly.
That message, even delivered with warmth and genuinely good clinical intentions, reactivates the nervous system states the intervention is supposedly trying to address. Shame is a threat signal. The body responds to it the same way it responds to any other perceived danger.
Recent research from Penn State makes the mechanism explicit: when people fear their own emotional experience, they shut down communication to protect themselves from it. This is not stubbornness. It is not resistance to therapy. It is the nervous system doing a very rational calculation about what is safe to express and what will cost too much. Labeling that as a skill deficit and adding more communication homework does not solve it. It often compounds it.
The demand-withdraw pattern that shows up in so many couples with trauma histories is not a personality pairing. It is a co-regulatory failure. Fredman et al.'s research on PTSD and dyadic conflict shows how unprocessed trauma organizes couples into these complementary survival roles: one pursues because escalation is the only strategy available for generating a response; one withdraws because shutdown is the only available protection from escalation. Both are trying to get to safety. Their paths look like they are aimed at each other.
As we covered in When Couples Therapy and Trauma Therapy Collide, recognizing when to pause and reframe the clinical approach is itself a core skill. For couples organized around these autonomic patterns, that reframe starts with dropping the communication diagnosis entirely.
What the trauma-informed therapist sees instead: not two people failing to connect, but two nervous systems in parallel dysregulation, each one making the other's state worse, and both of them doing exactly what their biology taught them to do.
This is where the framework stops being conceptual and starts being something you can use on Tuesday.
The goal is not to explain polyvagal theory to your clients. The goal is to shift the couple's relationship to these responses from personal indictment to shared curiosity. That shift changes everything. It is the difference between "why do you always shut down" and "what is your nervous system trying to protect right now." The question sounds small. The clinical effect is not.
There is a framing that tends to help: in the room there are not just two people. There are two nervous systems and a relational space between them. When the cycle starts, the conversation is happening between the nervous systems. The people have temporarily left the building. Redirecting the conversation from "you do this" to "what is happening in the room right now" is an externalization move, and it is often the first one that actually lands.
Before any of the language below can work, the couple needs a shared framework. This does not need to be a lecture. Three sentences, in plain English, about how the nervous system responds to perceived threat before conscious thought catches up is usually sufficient. The key concepts to convey: the body responds to threat automatically; both the escalation and the shutdown are survival responses, not choices; and safety is a biological need, not just a preference.
The Polyvagal Institute's explanation of the social engagement system, adapted into everyday language, is a useful resource for building that psychoeducation foundation. And NICABM's clinical application guide offers practical strategies for using this framework with clients who are new to the concept.
Once the foundation is there, language like this tends to open things up:
A question therapists often ask: is it helpful to use polyvagal language directly with couples, or is it too clinical? The concepts, yes. The jargon, no. Most couples do not need to know what the ventral vagal complex is. They do need to understand that their nervous system responds to perceived threat before their thinking brain has any input, and that both of their responses are survival strategies rather than character statements. Language like "your nervous system is in threat mode" or "your body is doing the only thing it knows how to do right now" lands for most couples because it is accurate and it removes blame without dismissing the real impact of the behavior. Introduce it gradually, find what resonates for this specific couple, and build a shared vocabulary over several sessions.
And a question that comes up when the shutdown is happening in real time: what do I say to a couple when one partner stonewalls in session? The first move is to slow the session before saying anything. Naming what is happening in an activated room often escalates the partner who is still mobilized. Once the pace is slower, something like "I notice things have gotten quiet. Can we check in before we keep going? What is happening in your body right now?" invites the withdrawing partner to access internal experience without requiring them to re-engage with the conflict content. If they cannot access language yet, that is useful clinical information: they may be too far into shutdown for verbal processing. In that case, redirect to a grounding anchor before any content engagement. The goal is not to get them talking again immediately. It is to help the nervous system register enough safety to make talking possible.
Knowing the science is the foundation. The clinical skill built on top of it is state tracking: the ongoing, real-time practice of monitoring both partners' autonomic states in session, noticing when those states shift, naming the shifts as they happen, and letting that information drive what you do next.
It is worth distinguishing this from general attentiveness: how does state tracking differ from just monitoring body language? Body language observation is general and interpretive in a social sense: this person looks tense, this person seems distracted. State tracking is purposeful and physiologically grounded. You are using observable cues, voice quality, breath rate, muscle tone, eye contact, word retrieval, pacing, affect, as data about the nervous system's current operating state. The question you are holding is not "what is this person feeling?" It is "what state is this nervous system in right now, and is that state compatible with the intervention I am about to attempt?"
In practice, state tracking means:
A question that often surfaces at this point: how do I know if my client is flooded or just disengaged? They can look similar from the outside, but the internal physiology points in opposite directions. A flooded partner is in high sympathetic activation, so look for subtle mobilization signals even when behavior appears contained: jaw tension, shallow rapid breathing, restlessness in the hands, a quality of effortful control rather than genuine calm. A partner in dorsal shutdown shows low arousal across the board: slow or monotone speech, reduced responsiveness to direct questions, a kind of absence behind the eyes that is different from ordinary distraction. One useful in-session check: ask a simple orienting question and notice both the latency and the effort of the response. Flooding produces a compressed, defended response. Shutdown produces a delayed, effortful one.
This is exactly where the EMDR with Couples training picks up. The course teaches a structured state tracking approach integrated directly with EMDR phases: how to read the cues with precision, how to name what you are observing without destabilizing the couple further, and how to use one partner's regulated state as a co-regulatory resource when the other is still finding their way back to the window. Knowing that state matters is the starting point. The training gives you the specific practice.
If you are ready to build that practice, the EMDR with Couples course is the next step. Enrollment is open now.
There are two questions a therapist can hold when the cycle starts.
The first: what are these two people doing to each other?
The second: what are these two nervous systems trying to do for themselves, and how is that landing in the space between them?
The first question leads to communication intervention. The tools exist, they are well-researched, and for a lot of couples they work. But they work in a regulated nervous system. When unprocessed trauma is running the show, the second question has to come first. Because until both partners understand that what they are watching in each other is a survival response and not a character indictment, no technique is going to hold.
Stonewalling is not contempt. Flooding is not aggression. Freeze is not disengagement. They are all the same thing: a nervous system doing its best with the threat information it has. When the therapist can see that, the clinical frame changes completely. And when the couple can start to see it too, something shifts. Not fixed, not healed, but shifted. A little less alone in the cycle. A little more curious and a little less certain that the other person is the enemy.
That shift is where the real work begins.
The EMDR with Couples training walks therapists through both pieces: the science of reading autonomic state in real time and the clinical language for naming it with couples in session. If this framework reflects what you have been sensing in your couples work, that is the course. Join the waitlist or register for the next cohort.
Fredman, S. J., Le, Y., Marshall, A. D., Portnoy, G. A., & Wanklyn, S. G. (2018). Longitudinal associations between PTSD symptoms and dyadic conflict communication following a severe motor vehicle accident. Journal of Family Psychology, 32(4), 530-540. https://pmc.ncbi.nlm.nih.gov/articles/PMC6029245/
Gottman, J. M. (2013, March). Physiological self-soothing. The Gottman Institute. https://www.gottman.com/blog/weekend-homework-assignment-physiological-self-soothing/
Levenson, R. W., Haase, C. M., Bloch, L., Holley, S. R., & Seider, B. H. (2016). Interpersonal emotional behaviors and physical health: A 20-year longitudinal study of long-term married couples. Emotion, 16(7), 965-977. https://pmc.ncbi.nlm.nih.gov/articles/PMC5042820/
National Institute for the Clinical Application of Behavioral Medicine. (2022). Polyvagal theory and trauma: Clinical applications. NICABM. https://www.nicabm.com/topic/polyvagal-theory-explained/
Penn State University. (2025, March). PTSD can undermine healthy couple communication when people fear their emotions. Penn State News. https://www.psu.edu/news/health-and-human-development/story/ptsd-can-undermine-healthy-couple-communication-when-people-fear
Polyvagal Institute. (n.d.). What is polyvagal theory? https://www.polyvagalinstitute.org/whatispolyvagaltheory
Porges, S. W. (2007). The polyvagal perspective. Biological Psychology, 74(2), 116-143. https://pmc.ncbi.nlm.nih.gov/articles/PMC1868418/
Porges, S. W. (2011). The polyvagal theory: New insights into adaptive reactions of the autonomic nervous system. Cleveland Clinic Journal of Medicine, 76(Suppl. 2), S86-S90. https://pmc.ncbi.nlm.nih.gov/articles/PMC3108032/
Porges, S. W. (2022). Polyvagal Theory: A science of safety. Frontiers in Integrative Neuroscience, 16, Article 871227. https://pmc.ncbi.nlm.nih.gov/articles/PMC9131189/
Trauma Therapist Institute. (n.d.). Dorsal vagal shutdown: A holistic approach to recovery and resilience. https://www.traumatherapistinstitute.com/blog/Dorsal-Vagal-Shutdown-A-Holistic-Approach-to-Recovery-and-Resilience