Primary gazeCentral · refer
Pure upbeat
The mirror image of downbeat — same red flag.
Primary gazeLive
Pure up-beating nystagmus in primary gaze, no torsion, spontaneous rather than positionally provoked. Like downbeat, this localises to the brainstem or cerebellum (pontomesencephalic or medullary) and is central on its own in acute vertigo — never treat it as BPPV.
Source: Leigh & Zee; Kattah 2009.
Other signs
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.