Effect of viewing distance and location of the axis of head rotation on the monkey's vestibuloocular reflex. I. Eye movement responses.
Effect of viewing distance and location of the axis of head rotation on the monkey's vestibuloocular reflex. I. Eye movement responses.
复制标题
观看距离和头部旋转轴位置对猴子前庭眼反射的影响。
DOI：
10.1152/jn.1992.67.4.861
复制
发表时间：
1992
影响因子：
2.5
通讯作者：
King,WM
中科院分区：
文献类型：
--
作者：
Snyder,LH;King,WM
1. 前庭眼反射 (VOR) 可以稳定视网膜上的图像，防止头部在空间中的移动。观看距离、目标偏心率和旋转轴的位置可能会影响 VOR 响应，因为头部围绕空间中大多数轴的旋转会相对于视觉目标旋转和平移眼睛。为了研究 VOR 对旋转和平移组合的响应，将猴子放在速率表上，并在黑暗中绕位于眼睛前面或后面的垂直轴短暂旋转。猴子固定一个近处或远处的视觉目标，该目标在旋转之前就熄灭了。使用搜索线圈技术记录双眼的眼球运动。 2. VOR 引起的峰值眼速与任何旋转轴的聚散角线性相关。在 20 度的聚散角下，近目标观察相对于远目标观察的 VOR 的百分比变化与旋转轴的位置线性相关。位于眼睛后面的轴产生 VOR 幅度的正变化，位于眼睛前面的轴产生 VOR 幅度的负变化。位于包含眼睛旋转中心的冠状平面中的旋转轴不会产生 VOR 幅度的变化。对于任何轴，VOR 补偿了眼睛相对于近目标的大约 90% 的平移。 3. 最初的 VOR 响应在幅度上不正确，但通过一系列复杂性不断增加的三个时间延迟校正进行了改进。最早的 VOR 诱发的眼球运动（旋转开始后 10-20 毫秒）与观看距离和旋转轴位置无关。在接下来的 100 毫秒内，眼速似乎连续改变了 3 次：在 20 毫秒内根据观看距离；通过耳石翻译在 30 毫秒内；并在 100 毫秒内通过眼睛相对于视觉目标进行平移。 4. 这些数据表明 VOR 的正式模型由四个通道组成。通道 1 传送未经修改的头部旋转信号，纯延迟为 10 ms。通道 2 传送头角速度信号，通过观看距离进行修改，纯延迟为 20 ms，但相对于旋转轴的位置不变。通道 3 传输线性头速度信号，取决于旋转轴的位置，该信号通过观看距离进行修改，纯延迟为 30 毫秒。（摘要截断为 400 字）
1. The vestibuloocular reflex (VOR) stabilizes images on the retina against movements of the head in space. Viewing distance, target eccentricity, and location of the axis of rotation may influence VOR responses because rotation of the head about most axes in space rotates and translates the eyes relative to visual targets. To study the VOR response to combined rotation and translation, monkeys were placed on a rate table and rotated briefly in the dark about a vertical axis that was located in front of or behind the eyes. The monkeys fixated a near or far visual target that was extinguished before the rotation. Eye movements were recorded from both eyes by the use of the search coil technique. 2. Peak eye velocity evoked by the VOR was linearly related to vergence angle for any axis of rotation. The percent change in the VOR with near target viewing relative to far target viewing at a vergence angle of 20 degrees was linearly related to the location of the axis of rotation. Axes located behind the eyes produced positive changes in VOR amplitude, and axes located in front of the eyes produced negative changes in VOR amplitude. An axis of rotation located in the coronal plane containing the centers of rotation of the eyes produced no modification of VOR amplitude. For any axis, the VOR compensated for approximately 90% of the translation of the eye relative to near targets. 3. The initial VOR response was not correct in magnitude but was refined by a series of three temporally delayed corrections of increasing complexity. The earliest VOR-evoked eye movement (10-20 ms after rotation onset) was independent of viewing distance and rotational axis location. In the next 100 ms, eye speed appeared to be sequentially modified three times: within 20 ms by viewing distance; within 30 ms by otolith translation; and within 100 ms by eye translation relative to the visual target. 4. These data suggest a formal model of the VOR consisting of four channels. Channel 1 conveys an unmodified head rotation signal with a pure delay of 10 ms. Channel 2 conveys an angular head velocity signal, modified by viewing distance with a pure delay of 20 ms, but invariant with respect to the location of the axis of rotation. Channel 3 conveys a linear head velocity signal, dependent on the location of the axis of rotation, that is modified by viewing distance with a pure delay of 30 ms.(ABSTRACT TRUNCATED AT 400 WORDS)