Fig. 3.

Exemples of eye movement recording during smooth pursuit (A), rotatory chair induced vestibulo-ocular reflex/visuo-vestibulo-ocular reflex (VOR/VVOR) (B) stimulations. In (A), eye position (dark line) and displacement of the triggering visual target (grey line) are plotted in a health subject (top) and a CANVAS patient (bottom). CANVAS patient shows jerky smooth pursuit. In (B) , eye position (dark line) and kinetic chair position (grey line) are plotted in a patient with isolated bilateral vestibular hypofunction (BHV) (top) and a patient with CANVAS (bottom). For purpose of better comparison, both eye and chair movements have been presented in one unique direction. In both patients VOR is deficient, but only the CANVAS patient shows the quite specific VVOR deficit