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. 2003 Jul 15;551(Pt 3):1033–1042. doi: 10.1113/jphysiol.2003.045971

Figure 1. Experimental setup.

Figure 1

The setup for each experiment is illustrated along with a schematic table of the conditions of feet position and support tested in each. The table key is at the bottom left. In Experiment I, the subject stood in a darkroom and GVS was applied while postural responses were measured with a camera targeted at markers on the feet, pelvis, C7 vertebra and head. Simultaneously, the subject aligned a visual indicator to vertical using a hand-held control (A) or aligned a manual control to vertical (B). In Experiment II, the subject stood on a platform that was tilted about a sagittal axis between the feet at ground level. The platform was held at the tilted position to the left (L) or right (R) while postural responses were similarly measured with a camera (C). In Experiment III, the subject stood freely on the floor (D) or was immobilised by being strapped to an upright support (E). GVS was applied for different durations and the subject reported the direction of any perceived movement to the left or right.