Polyvagal theory — the short version
Neuroscientist Stephen Porges spent decades studying the vagus nerve — the long, branching nerve that connects the brain to nearly every major organ in the body, including the heart, lungs, and gut. What he discovered, and articulated in polyvagal theory, fundamentally changed how trauma and attachment researchers think about the nervous system.
The autonomic nervous system — the part of the nervous system that operates below conscious control, regulating heart rate, breathing, digestion, and the body's threat response — is not simply an on/off switch between relaxation and stress. It has three distinct states, arranged in an evolutionary hierarchy, each with its own physiology, its own relational quality, and its own relationship to the breath.
The ventral vagal state — safe and social. This is the most evolutionarily recent state. When the nervous system detects safety, the ventral vagal circuit activates — and with it, a whole constellation of physiological and relational shifts. The heart rate becomes variable and responsive. The voice warms. The face becomes expressive. The body can engage, connect, receive care, and offer it. Breathing is full, relaxed, and naturally rhythmic.
This is the state of secure attachment. Not the absence of feeling, or the absence of difficulty — but the capacity to remain present through it, to return to connection, to regulate with and alongside other people.
The sympathetic state — mobilise. When the nervous system detects threat — real or perceived — the sympathetic branch activates. Heart rate rises. Breathing becomes fast and shallow, moving from the belly into the upper chest. Muscles prepare for action. The social engagement system goes offline. The world narrows to the threat.
For many people with anxious attachment, this state is familiar territory. The nervous system learned, early, that love was unpredictable — and it has remained in a low-level state of preparedness ever since. Ready to detect the earliest signs of danger. Ready to act before the loss comes.
The dorsal vagal state — shut down. When the nervous system detects threat that cannot be escaped or fought — when mobilisation fails — the oldest evolutionary system activates. The dorsal vagal state is one of immobilisation, shutdown, and disconnection. Heart rate drops. Breathing becomes shallow and minimal. Emotional numbness descends. The person is present but not quite here.
For many with avoidant attachment patterns, this state has been recruited not in response to acute threat but as a chronic management strategy. The nervous system learned that emotional contact led to disappointment or overwhelm — and found a way to make itself unavailable to feeling. The shutdown that was once survival has become a way of relating.
Where attachment patterns live — and why talking alone often isn't enough
Attachment patterns are not beliefs. They are not cognitive distortions to be challenged and corrected. They are physiological states — patterns of nervous system activation and deactivation that were learned before language, before the capacity for reflection, before any of the tools of rational self-understanding were available.
This is why insight alone rarely produces lasting change. A person with anxious attachment can understand, completely and accurately, that their partner going quiet does not mean they are leaving — and still feel the spike of sympathetic activation, still feel the breath shorten, still feel the urgent pull toward reassurance. The understanding lives in the cortex. The attachment response lives in the body.
Breathwork reaches where understanding cannot. Not because it bypasses the mind — it does not — but because it begins in the body, in the breath, in the physiological state itself. By changing the breath, we change the state. By changing the state, we change what is possible — in the nervous system, in relationships, and in the capacity to be with our own experience without being overwhelmed by it.