Tomko D L, Wall C, Robinson F R, Staab J P
Department of Physiology, School of Medicine, University of Pittsburgh, PA 15261.
Exp Brain Res. 1988;69(2):307-14. doi: 10.1007/BF00247576.
The vertical vestibulo-ocular reflex (VOR) was recorded in cats using electro-oculography during sinusoidal angular pitch. Peak stimulus velocity was 50%/s over a frequency range from 0.01 to 4.0 Hz. To test the effect of gravity on the vertical VOR, the animal was pitched while sitting upright or lying on its side. Upright pitch changed the cat's orientation relative to gravity, while on-side pitch did not. The cumulative slow component position of the eye during on-side pitch was less symmetric than during upright pitch. Over the mid-frequency range (0.1 to 1.0 Hz), the average gain of the vertical VOR was 14.5% higher during upright pitch than during on-side pitch. At low frequencies (less than 0.05 Hz) changing head position relative to gravity raised the vertical VOR gain and kept the reflex in phase with stimulus velocity. These results indicate that gravity-sensitive mechanisms make the vertical VOR more compensatory.
在猫处于正弦角俯仰状态时，使用眼电图记录垂直前庭眼反射（VOR）。在0.01至4.0 Hz的频率范围内，峰值刺激速度为50%/秒。为了测试重力对垂直VOR的影响，动物在直立或侧卧时进行俯仰。直立俯仰改变了猫相对于重力的方向，而侧卧俯仰则没有。侧卧俯仰期间眼睛的累积慢相成分位置不如直立俯仰期间对称。在中频范围（0.1至1.0 Hz）内，直立俯仰期间垂直VOR的平均增益比侧卧俯仰期间高14.5%。在低频（小于0.05 Hz）时，相对于重力改变头部位置会提高垂直VOR增益，并使反射与刺激速度保持同相。这些结果表明，重力敏感机制使垂直VOR更具代偿性。
