Gauthier G B, Piron J P, Roll J P, Marchetti E, Martin B
Aviat Space Environ Med. 1984 Jan;55(1):1-7.
The dynamic characteristics of the human vestibulo-ocular system were studied in the 0.5-30 Hz frequency range by rotating the head around a vertical axis. The rotation produced by a powerful servo-controlled vibrator was transmitted to the head by a hard-cushioned helmet and a rigid bite bar. The vestibulo-ocular reflex (VOR) gain and phase were measured during fixation of a mobile or stationary visual target and in total darkness. In a second set of experiments, the subjects evaluated the amplitude of the perceived visual instability of the target in the two fixation conditions. The results confirm earlier observations describing the VOR gain and phase in the 0.5-8 Hz range: the gain starts to decrease beyond 2 Hz and the phase rises towards 90 degrees. Beyond 8 Hz, the gain curve reverses direction and increases continuously toward 3-4 at 25-30 Hz in the three tested situations. Meanwhile, the phase curves do not vary much. In the same frequency range, the perceived visual instability is significantly altered. Therefore, the gain variation at high frequency may, in part, explain the perceived visual target instability and may be suspected of altering visually controlled tracking executed in vibrating environments.
通过绕垂直轴旋转头部，在0.5 - 30Hz频率范围内研究了人类前庭眼系统的动态特性。由强大的伺服控制振动器产生的旋转通过硬垫头盔和刚性咬杆传递到头部。在固定移动或静止视觉目标期间以及在完全黑暗的环境中测量前庭眼反射（VOR）增益和相位。在第二组实验中，受试者评估了在两种固定条件下目标感知到的视觉不稳定性的幅度。结果证实了早期关于0.5 - 8Hz范围内VOR增益和相位的观察结果：增益在超过2Hz时开始下降，相位向90度上升。超过8Hz时，在三种测试情况下，增益曲线反向并在25 - 30Hz时朝着3 - 4持续增加。同时，相位曲线变化不大。在相同频率范围内，感知到的视觉不稳定性会显著改变。因此，高频下的增益变化可能部分解释了感知到的视觉目标不稳定性，并且可能被怀疑会改变在振动环境中执行的视觉控制跟踪。
