Nervous system science
Your nervous system is constantly scanning for safety — long before your conscious mind has any say in it. Understanding this changes everything.
The autonomic ladder
Ventral vagal
Safe & Social
Connected, curious, open — the window of presence
Sympathetic
Fight or Flight
Mobilised, anxious, reactive — the body prepared for danger
Dorsal vagal
Shut Down
Collapsed, numb, disconnected — the body's last resort
Developed by neuroscientist Stephen Porges, Polyvagal Theory offers a map of the autonomic nervous system — specifically, how it shapes our capacity for connection, our emotional states, and our physical responses to perceived threat.
The nervous system doesn't think. It responds. It is constantly reading cues from the environment and from other people — a process Porges calls neuroception — and adjusting your physiological state accordingly. This happens below the level of conscious thought.
This is why you can know, rationally, that you're safe — and still feel afraid. Or know that someone means you well — and still find yourself shutting down. Your nervous system is operating from older, faster logic. Understanding that logic is one of the most liberating things therapy can offer.
"Understanding your nervous system states doesn't just explain the past — it gives you choices in the present you didn't know you had."
Ventral vagal
Safe & Social
The state in which connection, learning, and healing are possible. You feel present, regulated, and capable of relating. This is the state therapy works to expand access to.
"I feel like myself."
Sympathetic
Fight or Flight
Mobilisation in the face of perceived danger. Anxiety, irritability, urgency, restlessness. The body has prepared for action — even when the threat is a conversation or a memory.
"I can't settle. I need to do something."
Dorsal vagal
Shutdown
The oldest response — immobilisation when threat feels inescapable. Numbness, disconnection, fatigue, emptiness. Often mistaken for depression. The body conserving resources.
"I feel nothing. I can't connect."
Recognising that your reactions are your nervous system's best attempt at protection — not weakness, not failure — shifts the relationship you have with your own responses entirely.
Once you can name which state you're in, you can work with it rather than against it. Specific practices — breath, movement, sound, co-regulation — become targeted rather than generic.
Much of what goes wrong in connection — shutting down, escalating, needing distance — is nervous system behaviour. Polyvagal Theory makes this visible, without blame.
The nervous system is not fixed. Through experience, relationship, and the right conditions, it learns new patterns. The window of tolerance expands. Safety becomes more available.
Polyvagal Theory provides the theoretical underpinning for much of what happens in somatic therapy — helping explain why body-based approaches work. It also informs how I use IFS, since parts are often expressions of nervous system states. Understanding all three together creates a coherent framework for deep, lasting change.
Begin with a free 20-minute consultation — no obligation, no pressure. Just a conversation.