Skip to main content
. 2019 Jan 30;12(1):1–13. doi: 10.14802/jmd.18034

Figure 3.

Figure 3.

Results of the vestibular function tests in a representative patient with spinocerebellar ataxia type 6. A. Caloric tests. The sum of the peak SPV of the nystagmus in response to each caloric stimulus is increased at 174°/s (normal range=45–157°/s). B. Rotatory chair test. The gains of the VOR are normal during sinusoidal horizontal accelerations. Gray areas represent the normal ranges (mean ± 2SD). C. Head impulse tests. Head impulses in the plane of each SCC revealed decreased gain of the VOR for all six semicircular canals with overt catch-up saccades during stimulation of the horizontal and posterior SCCs. The blue lines indicate head velocity and the red lines represent eye velocity. D. The head impulse VOR gain for the HC is negatively correlated with the ataxia score as measured using the ICARS. SPV: slow-phase velocity, VOR: vestibulo-ocular reflex, SCC: semicircular canal, LAC: left anterior SCC, LHC: left horizontal SCC, LPC: left posterior SCC, RAC: right anterior SCC, RHC: right horizontal SCC, RPC: right posterior SCC, ICARS: International Cooperative Ataxia Rating Scale, HIT-HC: head impulse testing in the horizontal semicircular canal plane.