Polyvagal Theory: Three States
Polyvagal Theory (Porges, 2011) describes how the nervous system moves between three distinct states. These states are not chosen — they are physiological. Understanding them helps you recognise what is happening in your body and why.
The state of connection, curiosity, and engagement. Heart rate is regulated, breathing is easy, face is expressive, voice has prosody. This is the state in which learning, healing, and genuine connection happen. The window of tolerance lives here.
The fight/flight state. Heart rate elevates, breathing accelerates, muscles tense, attention narrows to the threat. Designed for short-term survival — effective against physical threats, ineffective against the chronic relational stressors most trauma survivors face. Sustained sympathetic activation becomes anxiety, chronic tension, irritability, sleep disruption.
The freeze/collapse state. Heart rate slows, energy drops, dissociation occurs, connection feels impossible. The evolutionary function is death-feigning — making yourself invisible or inedible to a predator. In trauma responses: numbness, disconnection, inability to feel, going blank. The most primitive state, activating when fight/flight would be futile.
Neuroception
The nervous system is constantly scanning the environment for threat — a process Porges calls neuroception. This scanning happens below conscious awareness. You do not decide which state to be in; your nervous system decides based on what it detects.
In a traumatised nervous system, neuroception is miscalibrated. The system detects threat where there is none, or interprets safety signals as danger. It is the result of a learning history that shaped the system’s settings.
About Polyvagal Theory
Porges’s Polyvagal Theory (2011) proposes that the vagus nerve has two branches with different evolutionary origins and different functions — the ventral vagal (myelinated, associated with social engagement) and the dorsal vagal (unmyelinated, associated with immobilisation). The theory has been highly influential in trauma treatment, though some aspects remain contested in the neuroscience literature. Its clinical utility — providing a framework for understanding and working with physiological states — is widely accepted regardless of the theoretical debate. See Porges, S.W. (2011), The Polyvagal Theory, W.W. Norton.