The Key to Vestibular Illusions: Sub-threshold movement
- Each of the vestibular organs has a threshold below which they detect no movement. (Individuals differ...)
- Gradual banks or turns are undetected until attention is drawn to them.
- Abrupt correction of an undesired attitude causes a strong illusion of movement in the opposite direction.
- Therefore illusions are a special risk in smooth air, when the airplane is more likely to go out of whack imperceptibly.
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