Fakespace Inc. BOOM3C display and tracker. The display is held to the eyes with one hand which controls a single button and an eight position thumb-operated joystick. Only the up and down positions of the joystick are used. The position and orientation of the head are tracked through the mechanical arm. Motion is controlled via an acceleration metaphor by which the subject accelerates forward in the virtual world by pushing up on the joystick and backward by pulling down.
Movement is always in the direction of view.
The subject may stop at any time by pushing the red thumb button. Orientation cannot be altered with the buttons or joystick. This is a nonparametric test of interval data suitable for experiments with small subject sample sizes. The sequencing of the four treatments was randomized among subjects. However, a training session on a separate environment under control conditions preceded the four treatments.