Table 1. .

Induced Vertical Deviation in Different Head Positions

Subject No.	Subject Age	Motor Deviation (REV–LEV), Degrees
		STR	RHT	LHT
1	27	2.4	1.5	2.7
2	25	1.7	0.1	2.6
3	25	4.0	3.3	2.9
4	24	−1.7	−2.9	−1.0
5	24	3.0	3.3	3.1
6	32	1.3	0.9	2.1
7	16	0.7	0.0	0.9

Incomitance was consistent among subjects. The median motor deviation (i.e., the video-oculographic measured difference between right and left eye vertical position) after adaptation to a right-over-left stimulus was greater with head tilted 45 degrees to the left (LHT) than head straight (STR) or tilted 45 degrees to the right (RHT). For subject 4, who adapted to a left-over-right vertical disparity, the induced left-over-right vertical deviation increased with right head tilt and decreased with left head tilt. Subject 5 showed minimal variation and subject 3 showed decreased deviation with head tilt to either side.