Pick any two disease archetypes and lay them on top of each other. The comparator is the fastest way to internalise how a normal SHA differs from a BVP one, or how vestibular migraine looks against a cerebellar pattern.
Three-panel SHA summary. Shaded green = published normal band. Solid marker = patient/archetype curve; dashed = overlaid reference if shown.
Normal VOR
Gain rises with frequency, phase lead falls toward zero, symmetry is < 22 %, Tc is 15–25 s.
Step Tc
18.0 s
Step gain
0.80
Bilateral vestibulopathy
Gold-standard finding for BVP: gain < 0.2 across frequencies with marked phase lead and Tc collapsing toward the cupula value (~5 s). Bárány criteria 2017.