Vestibular Labyrinth Contributions to Human Whole-Body Motion Discrimination

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Abstract
To assess the contributions of the vestibular system to whole-body motion discrimination in the dark, we measured direction recognition thresholds as a function of frequency for yaw rotation, superior–inferior translation (“z-translation”), interaural translation (“y-translation”), and roll tilt for 14 normal subjects and for 3 patients following total bilateral vestibular ablation. The patients had significantly higher average threshold measurements than normal (p< 0.01) for yaw rotation (depending upon frequency, 5.4× to 15.7× greater),z-translation (8.3× to 56.8× greater),y-translation (1.7× to 4.5× greater), and roll tilt (1.3× to 3.0× greater)—establishing the predominant contributions of the vestibular system for these motions in the dark.

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