What is Polyvagal Theory?
Understanding how we respond to stress, safety and connection
Polyvagal Theory is a model developed by neuroscientist Stephen Porges to explore how our bodies respond to perceived safety and threat.
You might know that an upcoming conversation isn't dangerous, yet notice your stomach tightening as it approaches. Or you might withdraw during an argument, even though you want to stay connected.
The theory offers one way of exploring the gap between what we understand about a situation and how we respond to it. It has become influential in trauma-informed practice, although important parts of its proposed physiology remain scientifically contested.
This page explains the model, where it can be useful and what research tells us about its limitations.
A model built around the vagus nerve
Porges began developing the theory in the 1990s. The autonomic nervous system looks after things like heart rate and digestion, and it plays a part in how the body responds to stress. Polyvagal Theory focuses on the vagus nerve, a major part of the parasympathetic nervous system, and proposes that different neural pathways support the patterns of experience described further down.
These ideas have influenced therapies that invite people to notice changes in the body instead of relying only on analysing their thoughts. Not all of the theory's physiological explanations have been established by research. Further down the page I set out where the disagreement lies and how I use the model in my own practice.
What is neuroception?
Porges introduced the term neuroception for the proposed process by which the nervous system evaluates cues of safety and danger outside conscious awareness.
Think of walking into a meeting and sensing that something is different. Someone speaks more sharply than usual, or there's an unexpected silence, and you tense up before you've worked out what concerns you.
Automatic responses to social and environmental cues are a familiar experience. The specific mechanism called neuroception belongs to Porges' account, though, and shouldn't be treated as a separately proven threat-detection system.
The more useful question is what you've noticed and what might help you respond. A raised voice can mean something different to a person who grew up around unpredictable anger than to a person whose experience has been quite different. Our histories shape what we pay attention to and how we respond.
The three states of Polyvagal Theory
The clinician Deb Dana has helped make the theory accessible through a metaphor known as the polyvagal ladder. It describes three broad patterns of experience, set out below.
The ladder can be useful for reflection. It isn't a literal map of three separate nervous system states, and how you feel doesn't reliably show which vagal pathways are active. Real life is messier. Someone can feel anxious and connected at once, or exhausted and physically restless.
Feeling safe and connected
In Polyvagal Theory, the ventral vagal state is associated with feeling safe enough to connect with other people.
You might notice that conversation comes more easily, or that you can listen to someone without immediately becoming defensive. Perhaps you're spending time with a friend and feel comfortable being yourself.
This is one of the experiences the polyvagal ladder attempts to describe. It doesn't mean we can identify a particular vagal state from how someone feels, and it doesn't mean being calm is a requirement for connection.
Feeling mobilised
Faced with a challenge or a threat, the sympathetic nervous system can raise physiological arousal. The heart beats faster, muscles tense and attention narrows.
Sometimes that helps, because you need energy to respond to something urgent or to speak up when a boundary has been crossed. At other times the response feels out of proportion, such as knowing a difficult conversation is manageable and still wanting to escape it. Sympathetic activation is an ordinary part of meeting life's demands.
Feeling withdrawn or disconnected
Some people respond to overwhelming situations by feeling numb, distant or unusually low in energy. Speaking can be hard, decisions can be hard, and the world around you can feel far away.
The theory links certain forms of protective withdrawal to dorsal vagal pathways, and that explanation is among its contested claims. Feeling exhausted, numb or disconnected doesn't tell anyone they are in dorsal vagal shutdown, and the same experiences turn up with depression, sleep difficulties, medical conditions and medication effects. Rather than treating shutdown as a diagnosis, it can be more useful to ask what you're experiencing and what kind of support would help.
What the ladder can and can't tell us
I find the ladder most useful as a way of getting curious about our responses.
Say an argument with your partner leaves you agitated, and later you go quiet and withdraw. Instead of deciding that you're overreacting, you might start to notice the changes in your body and the feelings that come with them. Maybe the intensity of the disagreement frightened you, or you felt criticised, or you needed time before you could speak again. The ladder gives you language for those shifts.
What it can't do is tell us precisely what is happening in your nervous system. Anxiety doesn't show that the sympathetic system is dominant, and numbness doesn't establish a dorsal vagal response. A model stops being helpful when every sensation gets treated as proof of a category.
I use the ladder to open a conversation about your experience, and I leave the labelling out.
Why understanding your reactions doesn't always change them
One of the more frustrating things about stress is that you can understand a response and still have it. You can know a presentation will go fine and still feel your chest tighten as you walk to the front of the room. You can see why conflict makes you anxious and find yourself getting defensive in the middle of an argument.
Insight matters. It helps with recognising patterns and reconsidering assumptions, though knowing why we react doesn't always change how we feel straight away. Responses are shaped by past experience and by how much stress we're carrying right now.
Some people find it helps to pay attention to bodily sensations alongside their thoughts and emotions, such as noticing tension in the shoulders while describing a difficult conversation, or an urge to pull away when talking about disappointment. Thinking and noticing the body can sit side by side, and each can teach us something.
Co-regulation and relationships
Some people are easier to be around on a hard day, like a friend who listens without interrupting or someone who speaks gently when you're distressed. Relationships do influence how we experience and handle stress.
Within Polyvagal Theory, co-regulation is the idea that interactions with other people can support physiological and emotional regulation. The importance of supportive relationships doesn't depend on the theory being right in every detail.
Co-regulation isn't automatic, though. Another person's calm can feel reassuring or uncomfortable, depending on the relationship, your history and what you need at the time.
In therapy I pay attention to what helps you feel comfortable enough to explore difficult experiences. That includes how we pace the conversation and whether you feel able to tell me when something isn't working.
Can slow breathing help you settle?
Breathing is one way we can influence aspects of our physiology. A systematic review and meta-analysis of 31 studies, with 1,133 participants in total, found short-term changes after slow-paced breathing, including lower systolic blood pressure and higher heart-rate variability. Evidence for emotional benefits was limited, and only two of the studies followed people up later.
If breathing exercises feel comfortable, you could slow your breath a little and let the out-breath run slightly longer than the in-breath. There's no need to force it, hold it or aim for a particular count. Notice what happens. Your breathing might become more comfortable, or you might feel no difference.
For some people, focusing on the breath raises anxiety or discomfort. If that happens, you don't need to persist. Other options include looking around the room for something pleasant or interesting, feeling the chair beneath you or your feet on the floor, standing up to stretch, taking a short walk, or spending time with someone whose company feels supportive. Treat these as things to try, to see what helps.
Sometimes a practical change matters more than an exercise. If you're dealing with an unsafe relationship or an unsustainable workload, managing your response to stress is only part of the picture, and the circumstances deserve attention too.
For more on what regulation means in everyday life, read my guide to nervous system regulation.
Is Polyvagal Theory scientifically supported?
Polyvagal Theory has had a substantial influence on how many practitioners talk about trauma, bodily responses and relationships. Influence in clinical practice isn't the same as scientific validation.
There is established evidence that the autonomic nervous system contributes to physiological responses to stress, and the vagus nerve helps regulate several bodily functions. The controversy is about particular explanations the theory proposes. Researchers have challenged its account of how vagal pathways evolved, the functions it assigns to different brainstem regions, its interpretation of respiratory sinus arrhythmia, and the link it draws between vagal pathways and psychological states.
Respiratory sinus arrhythmia is the natural variation in heart rate that occurs with breathing. Researchers disagree about how Polyvagal Theory interprets this measure and what conclusions can be drawn from it about psychological states.
In 2026 an international group of researchers led by Paul Grossman published a detailed critique, arguing that several foundational claims of the theory are inconsistent with the physiological evidence. Stephen Porges then published a response, arguing that the critique misunderstood his systems-level model. Both papers are linked at the foot of this page so you can read the disagreement for yourself.
The dispute is substantial, and it would be wrong to describe it as a quarrel over minor anatomical detail. Finding a polyvagal-informed practice useful also doesn't show that the theory explains why it works.
A practice and the theory used to explain it have to be judged on their own evidence.
For me, the theory offers language that can help people reflect on their experience. I don't use it to diagnose someone's nervous system state or as proof of a physiological mechanism.
How Polyvagal Theory informs my work
I'm a certified Somatic Experiencing® Practitioner, and I also draw on Internal Family Systems (IFS). Both approaches involve getting curious about how we respond to difficult experiences.
In Somatic Experiencing®, I may invite you to notice what happens in your body as we talk about something troubling. Your jaw might tighten as you describe an argument, or your shoulders lift as you talk about a conversation you've been avoiding. We slow down and explore that response together. Sometimes we look at what helps you feel more supported, and at other times at an uncomfortable sensation or an urge to move away. The aim is to understand your experience and see whether different responses become possible, without forcing your nervous system into a calm state.
I also work with people who notice conflicting parts of themselves, such as one part that wants closeness while another feels safer keeping people at a distance. IFS offers another way of exploring those responses without treating them as failures.
Polyvagal Theory can inform how I think about stress and connection, but the work doesn't require you to accept every aspect of it. I explain what we're doing, pay attention to your responses and work with you collaboratively. You can read more about Somatic Experiencing® and Internal Family Systems elsewhere on this site.
When might professional support help?
Feeling stressed, angry or disconnected from time to time is part of life. It's worth seeking support when these experiences become persistent, hard to understand or start to affect your relationships and everyday functioning. You might notice that you're often on edge, slow to recover after stressful situations, or withdrawing in ways that concern you. There's no need to work out which polyvagal state you're in before asking for help.
If you have new, severe or unexplained physical symptoms, a GP is the right starting point. Anxiety and fatigue have many causes, and they shouldn't automatically be put down to a nervous system problem or trauma. Depending on your needs, a psychologist, counsellor, psychiatrist or another appropriately qualified professional may also help.
This page is general information and not a diagnosis. If you need help urgently, contact your GP, call Lifeline on 13 11 14, or in an emergency call 000.
Frequently asked questions
What is Polyvagal Theory in simple terms?
Polyvagal Theory is Stephen Porges' proposed model of how different patterns of autonomic nervous system activity relate to perceived safety, threat and social connection.
It has become popular in trauma-informed practice, although important parts of its physiology remain scientifically disputed.
What is the vagus nerve?
The vagus nerve is a major nerve that carries signals between the brainstem and organs such as the heart and the digestive system.
It contributes to parasympathetic regulation. Polyvagal Theory proposes further links between vagal pathways and emotional experience, but research hasn't established all of them.
What is neuroception?
Neuroception is Porges' term for a proposed process through which the nervous system detects cues of safety and threat without conscious awareness.
It offers one theoretical explanation for why we sometimes react before we've fully understood a situation.
What are the three states of Polyvagal Theory?
The theory, as pictured in Deb Dana's ladder, describes a ventral vagal state linked with connection and engagement, sympathetic mobilisation under stress, and a dorsal vagal state linked with withdrawal and shutdown.
The ladder is a simplified teaching model. How you feel doesn't reliably show which pathways are active.
Is Polyvagal Theory scientifically proven?
Polyvagal Theory has influenced trauma-informed practice, but important aspects of its physiology remain scientifically contested.
Researchers disagree about several foundational claims, including how vagal pathways relate to psychological states. Stephen Porges has published responses defending his theory.
The research section above explains the disagreement and links to papers presenting both perspectives.
How does this relate to Somatic Experiencing®?
Polyvagal Theory and Somatic Experiencing® both draw attention to how people respond physically to stress and overwhelming experiences. In Somatic Experiencing®, we may explore sensations, movement impulses and changes in bodily response while talking about difficult situations.
Polyvagal Theory is one framework that can inform that work, and Somatic Experiencing® doesn't depend on every claim of the theory being correct. Research into Somatic Experiencing® is still developing, and I don't present it as a proven replacement for established trauma treatments. For diagnosed PTSD, trauma-focused CBT and EMDR have a stronger evidence base and appear in recognised clinical guidelines. You can read more in the Somatic Experiencing® explainer.
Read the research for yourself
These include work from both sides of the disagreement, along with the breathing review mentioned above.
- Porges (2025), Polyvagal Theory: Current Status, Clinical Applications, and Future DirectionsThe theory's developer explains and defends its physiological model and its clinical applications.
- Grossman and colleagues (2026), Why the Polyvagal Theory Is UntenableAn expert critique of the theory's physiological and evolutionary foundations.
- Porges (2026), When a Critique Becomes UntenablePorges' response to the critique.
- Systematic review and meta-analysis of slow-paced breathingEvidence for short-term physiological effects of slow breathing, with limits on what it shows about emotions and longer-term outcomes.
Related ideas
What is Somatic Experiencing®?
A body-based approach to working with stress and trauma, and how it relates to these ideas.
Read →What is parts work?
A way of working with the parts of you that hold protection and pain.
Read →Building Capacity
A program for building steadier, more flexible ways of responding to stress.
See the program →Interested in exploring your own responses?
You might recognise some of these patterns in your own life, such as staying tense after a stressful situation or withdrawing when a conversation becomes difficult.
In our work together, we can explore these experiences without needing to identify a particular nervous-system state.
I offer Somatic Experiencing® and Internal Family Systems in Thornbury, Elsternwick and Toorak, and online across Australia.
If you'd like to explore whether working together would suit you, I offer a free 45-minute consultation.