Head position modulates optokinetic nystagmus.
Head position modulates optokinetic nystagmus.
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DOI：
10.1007/s00221-011-2785-x
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发表时间：
2011-08
影响因子：
2
通讯作者：
Barmack, N. H.
中科院分区：
文献类型：
--
作者：
Pettorossi, V. E.;Ferraresi, A.;Botti, F. M.;Panichi, R.;Barmack, N. H.
方向和运动依赖于视觉和前庭信息映射在单独的坐标系。在这里，我们研究如何协调系统相互作用，以指导眼睛运动的兔子。我们将兔子暴露于5 °/s的连续水平视动刺激（HOKS）以引起水平眼球运动，同时它们围绕纵轴静态或动态地滚动倾斜。在单眼或双眼HOKS中，当兔眼侧倾30 °后→前（P → A）刺激时，慢相眼速度（SPEV）增加3.5~5 °/s。当兔子在A → P方向上被刺激的眼侧上滚动倾斜30 °时，SPEV降低到~2.5 °/s。我们还测试了长时间视动刺激诱导负视动性后眼震（OKAN II）后的侧倾效应。在这种情况下，SPEV发生在黑暗中，“开环”。OKAN II对SPEV的调制依赖于眼球震颤的方向，与“闭环”HOKS期间观察到的一致。动态侧倾以类似的方式影响HOKS诱发的SPEV。SPEV的振幅和相位取决于前庭振荡频率和HOKS速度。我们的结论是，在侧倾过程中相对于头部的重力矢量的线加速度的变化调制的SPEV的增益取决于它的方向。这种调制提高了在中心或偏心头部运动期间由头部滚动倾斜引起的不同图像视网膜滑动速度下的凝视稳定性。
Orientation and movement relies on both visual and vestibular information mapped in separate coordinate systems. Here, we examine how coordinate systems interact to guide eye movements of rabbits. We exposed rabbits to continuous horizontal optokinetic stimulation (HOKS) at 5°/s to evoke horizontal eye movements, while they were statically or dynamically roll-tilted about the longitudinal axis. During monocular or binocular HOKS, when the rabbit was roll-tilted 30° onto the side of the eye stimulated in the posterior → anterior (P → A) direction, slow phase eye velocity (SPEV) increased by 3.5–5°/s. When the rabbit was roll-tilted 30° onto the side of the eye stimulated in the A → P direction, SPEV decreased to ~2.5°/s. We also tested the effect of roll-tilt after prolonged optokinetic stimulation had induced a negative optokinetic afternystagmus (OKAN II). In this condition, the SPEV occurred in the dark, “open loop.” Modulation of SPEV of OKAN II depended on the direction of the nystagmus and was consistent with that observed during “closed loop” HOKS. Dynamic roll-tilt influenced SPEV evoked by HOKS in a similar way. The amplitude and the phase of SPEV depended on the frequency of vestibular oscillation and on HOKS velocity. We conclude that the change in the linear acceleration of the gravity vector with respect to the head during roll-tilt modulates the gain of SPEV depending on its direction. This modulation improves gaze stability at different image retinal slip velocities caused by head roll-tilt during centric or eccentric head movement.
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