Gaze holdingPeripheral · treat

Alexander's law

Peripheral nystagmus grows toward the fast phase but never reverses.

Gaze holdingLive

A unidirectional vestibular nystagmus is strongest looking toward the fast phase and weakest looking away, and it keeps the same direction across gaze. That intensity gradient is peripheral. A fast phase that switches direction with gaze is gaze-evoked and central instead.

Source: Leigh & Zee; HINTS exam (Kattah 2009).

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Other signs

Head impulse - covert saccade

Head impulse (thrust)

Bilateral abnormal head impulse

Head impulse (both sides)

Up-beating torsional

Dix-Hallpike

Stylised teaching animations authored by NeuroDash. Not real-patient recordings, not board-certified, and not reviewed by an outside specialist. Educational only — not medical advice or a diagnosis.