Table 1

SHV and SVV Results with negative values as leftward bias and positive values as rightward bias

Head	Hand used	SHV ± SEM (°)	SVV ± SEM (°)		Task bias ± SEM (°)	SHV spatial bias ± SEM (°)	SVV spatial bias ± SEM (°)
Left tilt	Left hand	−0.2 ± 1.1	3.9 ± 1.1	4.4 ± 0.7	−4.2 ± 1.5	3.9 ± 0.7	4.3 ± 1.0	4.9 ± 0.7
	Right hand	11.8 ± 0.9	4.9 ± 1.0	4.4 ± 0.7	6.9 ± 1.3	4.4 ± 0.7	5.4 ± 0.9
Upright	Left hand	−4.2 ± 1.1	−0.4 ± 0.4	−0.5 ± 0.3	−3.7 ± 1.1
	Right hand	7.4 ± 1.0	−0.5 ± 0.4	−0.5 ± 0.3	7.9 ± 1.0
Right tilt	Left hand	−8.8 ± 0.9	−6.0 ± 1.3	−5.2 ± 0.9	−2.8 ± 1.5	−4.6 ± 0.9	−5.6 ± 1.4	−4.7 ± 1.0
	Right hand	2.8 ± 1.0	−4.3 ± 1.3	−5.2 ± 0.9	7.2 ± 1.5	−4.6 ± 0.8	−3.8 ± 1.3

The task bias was calculated as the difference between the SHV task and the SVV task for each subject. The spatial bias was calculated as the difference between SHV or SVV task values with the head tilted and upright.