Participants are carefully positioned on the platform by aligning the lateral malleoli with the axis of rotation of the platform and visual surround. Participants wear a harness during all testing, which protects participants from falling. As an additional safety measure, the technician stands behind the participant. There are three trials per condition with each trial lasting 20 seconds. When a participant takes a step, touches the surround panels, or needs assistance from the technician, that trial is marked as a fall and the participant receives an equilibrium score of zero for that trial.