This article relies largely or entirely on a single source. (June 2020)
Air Force personnel demonstrating the effect on the sensory perception and spatial orientation of a test person in a Bárány chair. After first having been rotated in the chair and then stopped, the test person tries to point at a test board.
The subject is placed in the chair, blindfolded, then spun about the vertical axis while keeping their head upright or tilted forward or to the side. The subject is then asked to perform tasks such as determine their direction of rotation while blindfolded, or rapidly change the orientation of their head, or attempt to point at a stationary object without blindfold after the chair is stopped. The chair is used to demonstrate spatial disorientation effects, proving that the vestibular system is not to be trusted in flight. Pilots are taught that they should instead rely on their flight instruments.