Fig. 2
From: Visuo-postural dependency index (VPDI) in human postural control
Panel a: Example of positioning during subjective visual vertical and horizontal (SVV and SVH, respectively) tests: (1) Eyewear utilized to restrict visual field to 110°, (2) Laser emitter, (3) Head rest, and (4) Remote control used for rotation of laser bar. Panels b and c: Schematic representation of participants’ view of the laser bar (thick trace). Dashed traces and the error (α angle) are shown for illustration purposes. They were not visible to participants. Sizes and proportions have been modified for illustration purposes