Nervous System
Polyvagal states, hyperarousal, hypoarousal, ventral-dorsal-sympathetic, the autonomic ladder.
32 entries
All behaviors in Nervous System
Autonomic Ladder Movement
Deb Dana's clinical model derived from polyvagal theory: the body moves through ventral, sympathetic, and dorsal states in sequence, never by leap. Reconnection from shutdown requires passing back through mobilization — you cannot skip a rung.
Autoregulation Failure
The chronic, system-level inability to return the autonomic nervous system to the window of tolerance — not a single bad moment, but the lived condition of a body that cannot reliably transition between activation and rest.
Co-Regulation
The process by which one nervous system calms or organises another through proximity, attunement, and rhythmic exchange. Edward Tronick's foundational concept and Stephen Porges's polyvagal extension: self-regulation is built on top of having been co-regulated, repeatedly, by a present and steady other.
Collapse Response
The terminal point of dorsal-vagal activation — the body shuts down so fully that mobility, and sometimes consciousness, is reduced. The nervous system's last-resort defence when threat exceeds capacity.
Cue-of-Safety Override
The conscious decision to proceed away from a situation the autonomic system has classified as safe — when that classification is the trained miscalibration of a nervous system shaped by abuse, grooming, or chronic attachment rupture.
Cue-of-Threat Override
The trainable capacity to consciously re-classify an autonomic threat signal when context confirms no actual danger — staying with the felt activation while letting the body's classifier recalibrate. Distinct from suppression.
Dorsal Vagal State
The oldest branch of the parasympathetic — an immobilisation circuit that takes the system offline when fight and flight have failed. Read through Meaning Density Theory: the somatic substrate of functional freeze, collapse, and the numb phase of the chronic numb-crave-crash loop.
Fawn Response
Pete Walker's fourth F: when fight, flight, and freeze are all unavailable, the body keeps you safe by pleasing the threat. Accommodation as a survival strategy — and the self-erosion that compounds when the strategy outlives its origin.
Fight Response
One of the four threat responses (fight, flight, freeze, fawn). The body mobilizes for confrontation — muscles tense, jaw clenches, attention narrows, anger rises. Functional under acute survival threat; corrosive when chronically mis-fired at conversations, emails, and Tuesday mornings.
Flight Response
The second of the four threat responses — the body mobilizes to escape. Functional under acute physical threat; corrosive when chronically triggered by stressors that cannot be outrun.
Freeze Response
The third of the four threat responses: when fight and flight are both unavailable, the body immobilizes while remaining hyper-alert. Undischarged, it accumulates as somatic residue that can persist for decades.
Functional Freeze
The freeze response operating in chronic, low-grade form in a person who outwardly appears to function — a dorsal-vagal collapse-shutdown carried inside a competent exterior, where the body is offline while the life keeps running.
Heart Rate Variability
The beat-to-beat variation in time between heartbeats — counterintuitively, the most-validated noninvasive proxy for autonomic flexibility. Higher variability indicates a healthier, more adaptive nervous system; lower variability indicates rigidity. The number is not the system.
Hyperarousal
The chronic over-arousal state — sympathetic activation that does not downshift. Hypervigilance, exaggerated startle, sleep difficulty, racing thoughts. One of the two arousal extremes outside the window of tolerance; the Threat System stays online beyond the moment, at the cost of every system that requires the body to settle.
Hypoarousal
The chronically under-aroused state — dorsal-vagal collapse that does not lift. Flat affect, low energy, foggy thinking, withdrawal. The body's retreat when mobilisation has been judged unsafe or useless.
Immobilization With Safety
The autonomic configuration in which the body accesses deep stillness without collapse — dorsal-vagal stillness held inside ventral-vagal safety. The physiology of held rest, co-sleep, post-orgasm calm, and contemplative silence in trusted company.
Mobilization Without Threat
The autonomic state in which the body's sympathetic-mobilization system runs at full capacity while the nervous system reads safety — high arousal without threat valence. The physiology of play, flow, dance, and trusted intimacy. One of the highest-density states the framework recognises, and one most adults have partially lost access to.
Nervous System Repair Practices
The catalog of body-first practices that directly engage the autonomic nervous system — discharging activation, raising vagal tone, widening the window of tolerance — so cognitive and meaning-level work has a body to land in.
Nervous System Resourcing
The clinical practice of deliberately strengthening the nervous system's reservoir of safety-cues, regulating capacity, and human supports before attempting harder material — the somatic prerequisite for sustainable meaning-density work.
Nervous System Tracking
The deliberate practice of noticing one's autonomic state throughout the day — asking, in any given moment, where on the ladder the body actually is. The foundational somatic skill: you can only regulate what you can first detect.
Neuroception
Stephen Porges's term for the unconscious autonomic process by which the nervous system continuously scans for safety, danger, and life-threat — beneath conscious perception, and the substrate on which the Threat System is calibrated.
Parasympathetic Activation
The 'rest and digest' branch of the autonomic nervous system — the state in which heart rate slows, digestion restores, repair runs, and, in the MDT reading, deposit-landing becomes possible at the body level.
Polyvagal Theory
Stephen Porges's model of the autonomic nervous system as having three branches rather than two — sympathetic, dorsal vagal, and ventral vagal — and what that distinction lets the Threat System see that the classical model could not.
Safety Cue Recognition
The autonomic capacity to register environmental and relational cues as safe — the Threat System's complementary skill, often under-developed in trauma backgrounds, and trainable through deliberate exposure to cues the body can hear.
Self-Regulation
The capacity to bring one's own nervous system back into the window of tolerance without external co-regulation — built from sustained co-regulation in childhood, trainable in adulthood, and distinct from the suppression that wears its shape.
Startle Response
The body's pre-cognitive alarm reflex — eye blink, neck flexion, muscle bracing, brief sympathetic spike — and how its unsupplemented repetition in modern environments turns into a slow autonomic residue the system never fully discharges.
Sympathetic Activation
The fight-or-flight branch of the autonomic nervous system — a fast, mobilising state built for acute threat and prone, in modern life, to becoming chronically held without discharge.
The Orienting Response
The body's automatic 'what is this' — the autonomic turn toward a novel stimulus, with attention focusing and heart rate momentarily slowing for assessment. Distinct from startle (alarm) and from threat response (mobilisation). When orienting is healthy, the world stays legible; when it is trauma-altered, novelty is read as danger before it is read at all.
Threat-Cue Tracking
The pre-cognitive scanning function the nervous system uses to detect environmental cues that signal possible threat — facial micro-expressions, vocal tone shifts, the felt-pressure of attention from others. Useful when acute; exhausting when chronic.
Vagal Tone
The functional strength of the vagus nerve — the body's measurable capacity to flexibly downshift after activation, return to social engagement, and let a deposit actually land.
Ventral Vagal State
The newest evolutionary branch of the parasympathetic nervous system — the social engagement state of safety, connection, and present contact. Distinct from the dorsal shutdown that can also wear the surface of calm.
Window of Tolerance
Dan Siegel's foundational concept for the autonomic zone in which a person can think, feel, regulate, and engage — the band of arousal where attention, choice, and meaning can land. Above it is hyperarousal; below it is hypoarousal; trauma narrows it; integration widens it.