Table I. The overall incidence of “secondary signs of lateralization”.
| Signs | Present (%) | Absent |
| Pseudo-spontaneous nystagmus | 36 (56.2) | 28 |
| Bending nystagmus | 38 (59.3) | 26 |
| Bowing and leaning nystagmus | 24 (37.5) | 40 |
| HSIN | 40 (62.5) | 24 |
| Nystagmus from sitting to supine position | 48 (75) | 16 |
| Null-point in the yaw plane | 34/36 (94.4) | 2 |
| Conversion to a geotropic form by HR | 8 (12.5) | 56 |
| Conversion to a lateral geotropic form after GM | 28/56 (50) | 28 |
| Conversion to a posterior canalolithiasis after GM | 4 (6.2) | 60 |
HSIN: head shaking-induced nystagmus; HR: head roll in the supine position; GM: Gufoni’s manoeuvre