Vestibular Research during Spaceflight – The Role of the Gravity Vector
The vestibular labyrinth in the inner ear can be likened to a six degree-of-freedom navigation transducer. The so-called semicircular canals operate as a triaxial angular rate sensor, thus perceiving rotations of the head about any axis. The so-called otolith organs operate similarly to a triaxial linear accelerometer, transducing linear acceleration, and therefore gravity. For example they provide the necessary information to determine where “up” and “down” is.
KeywordsSemicircular Canal Linear Acceleration Subjective Visual Vertical Otolith Organ Luminous Line
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