Observed nystagmus patterns based on semicircular canal involvement
| Provocative maneuver | Nystagmus direction | Affected canal |
|---|---|---|
| Dix-Hallpike | To the affected side and up | Posterior |
| Dix-Hallpike | To the affected side and down | Anterior |
| Supine roll, right ear down Supine roll, left ear down | Right (geotropic) Left (geotropic) | Horizontal. The head-turn direction eliciting stronger nystagmus indicates the affected horizontal canal |
| Supine roll, right ear down Supine roll, left ear down | Left (apogeotropic) Right (apogeotropic) | Horizontal. The head-turn direction eliciting weaker nystagmus indicates the affected horizontal canal |