Table II. “Secondary signs of lateralization” in cases of uncertain diagnosis of affected side.

	PS	HSIN	B&L	Be	SiToSu	NP	Diag Tran	Ther Tran	Diagnosis
1	–	R	B R L Le	R	–	Le	–	–	Le Apo
2	R	Le	–	Le	R	–	–	Post R	R Apo
3	–	–	–	–	Le	Le	–	–	Le Apo
4	Le	R	B R L Le	R	–	–	–	Geo Le	Le Apo
5	Le	–	–	–	Le	–	Geo Le	–	Le Apo
6	–	Le	B Le L R	Le	R	R	–	–	R Apo
7	–	–	B Le L R	Le	R	R	–	–	R Apo
8	R	Le	–	–	R	–	–	Post R	R Apo
9	–	R	–	–	–	Le	–	–	Le Apo
10	R	Le	B Le L R	Le	–	–	–	Geo R	R Apo
11	–	–	–	–	Le	–	Geo Le	–	Le Apo
12	R	Le	B Le L R	Le	R	R	–	Geo R	R Apo

PS: pseudo-spontaneous nystagmus; HSIN: head shaking-induced nystagmus; B: bowing nystagmus; L: leaning nystagmus; Be: bending nystagmus; SiToSu: nystagmus from the sitting to the supine position; NP: null point on the yaw plane; Diag Tran: transformation into a geotropic form by repeated head-roll test; Ther Tran: transformation into a lateral geotropic form or a posterior canalolithiasis by the Gufoni’s manoeuvre; Geo: geotropic lateral canalolithiasis; Post: posterior canalolithiasis; Le: left; R: right; Apo: apogeotropic lateral canalolithiasis.