Figure 1.

Equipment and protocol used in this study. (Left) An image of a subject standing before the visual scene projected within the virtual environment. Beneath is a diagram of the protocol for the eyes closed and constant upward pitch rotation of the visual field conditions. The vibration stimulus was sub-threshold for each subject. For each condition, subjects were either standing quietly or performing a mental calculation task. The first 30 seconds and the last 30 seconds of the trial had no vibration. Vibration was turned on during the middle 30 seconds of each trial. (Right) Diagram of the vibrating flip-flops showing the connection between the vibrators and the computer for data collection. Image shows the scale of the DC Vibrator Motor in cm.