The NSI Lexicon

The nervous system rising to meet a challenge — not always a bad thing.

How the body maintains stability through change, rather than by holding still.

The brain’s alarm system — the first flag on a threat, real or imagined.

The nervous-system pattern of who we turn to when we cannot regulate alone.

The part of you that keeps you alive without asking.

See: The autonomic nervous system

The nervous-system state a person tends to return to when nothing is pressing.

Change that begins in the body and reaches the mind — not the other way around.

The felt sense when heart, breath, and thought move at the same tempo.

Being calmed by another calm nervous system.

See: Emotional co-regulation

A protective distance the nervous system creates when overwhelmed.

The oldest branch of the vagus — the freeze / shut-down response.

Bringing an activated system back to a steadier state.

The classical activation response — mobilise, escape, protect.

Not the absence of movement but the presence of a specific protection.

A micro-cue of safety — the opposite of a trigger.

The nervous system stuck in the accelerator — alert, restless, hard to sleep.

The nervous system stuck in the brake — numb, foggy, disconnected.

The sense of what is happening inside your body — hunger, tension, breath, heart.

The nervous system’s under-the-radar reading of threat or safety, before thought.

The nervous system’s ability to rewire itself through repetition and safety.

See: How the nervous system learns

A five-step practice for intentionally responding to nervous-system patterns: Notice → Interrupt & Identify → Regulate → Validate → Align.

See: The NIRVA Method

Nervous System Intelligence — the emerging discipline that names what the body already knows.

See: What is Nervous System Intelligence?

The brake pedal of the nervous system — rest, digest, restore.

See: The parasympathetic nervous system

A nervous-system loop rehearsed enough times to become a reflex.

See: How patterns form

An influential, still-debated model of how the vagus nerve shapes safety, connection, and defense.

The window in which a re-visited memory becomes editable.

See: Memory reconsolidation

The skill of guiding the nervous system back toward a workable state — not calm on demand.

See: What is nervous system regulation?

The relational rhythm through which safety is rebuilt after conflict.

The felt sense of being met, held, and not-in-danger — the precondition for change.

Pertaining to the body — the felt, moved, embodied dimension of experience.

The nervous system rising to meet what it perceives as demand.

See: What is stress?

The accelerator branch of the autonomic system — energy, alertness, movement.

See: The sympathetic nervous system

Approaching a difficult feeling in small, tolerable doses instead of all at once.

Change that begins in the mind — language, meaning, story — and reaches the body.

A cue that reopens an old nervous-system pattern before thought can intervene.

The longest cranial nerve — the highway between brain, heart, and gut.

The newest branch of the vagus — the social-engagement / safety state.

The range of arousal in which a nervous system can still learn, feel, and choose.