NYSTAGMUS INDUCED BY OFF-VERTICAL ROTATION AXIS IN THE CAT
NYSTAGMUS INDUCED BY OFF-VERTICAL ROTATION AXIS IN THE CAT
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DOI：
10.1007/bf00279663
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发表时间：
1988-01-01
影响因子：
2
通讯作者：
DENISE, P
中科院分区：
文献类型：
--
作者：
DARLOT, C;DENISE, P
1)在警觉猫中，记录了由偏离垂直轴旋转（OVAR）引起的眼球震颤，这些眼球震颤是在头部速度的阶跃或在低于通道阈值的恒定加速度下的速度斜坡之后发生的。研究了眼震特征与旋转轴倾斜角和头速的关系。两种类型的刺激获得了类似的结果。2)在0 ° ~ 30 °范围内，水平眼速度的平均值和调制幅度随倾斜角度的增加而增加。3)这两个变量也增加了头的速度，但有不同的趋势，可能是因为它们是由不同的机制。当头部旋转速度增加到80 °/s以上时，s时，平均眼速度逐渐下降至零。4)尽管从一个动物到另一个的变化，在眼速度调制的相位观察到一些规律性。在几种情况下，减少眼速度相对于传统的相位原点（鼻子向下的位置）的相位领先时，头部速度增加。5)OVAR术后眼震时间常数随旋转轴相对重力的倾斜角度而减小，但不随头部相对旋转轴的方位而减小。6)结果可以占一个一般方程描述前庭眼反射，头部运动（头部旋转和平移速度）的运动学变量的估计，视觉目标的距离可以计算的中枢神经系统。
1) In the alert cat, nystagmus induced by off-vertical axis rotation (OVAR) was recorded following steps in head velocity or ramps of velocity at constant acceleration below canal threshold. Dependence of nystagmus characteristic on tilt angle of rotation axis and head velocity was studied. Similar results were obtained with both types of stimulation. 2) Mean and modulation amplitude of horizontal eye velocity increased with tilt angle in the range 0-30 degrees. 3) Both variables increased also with head velocity, but with different trends, probably because they are set by different mechanisms. When head rotational velocity was increased above 80.degree./s, mean eye velocity progressively decreased to zero. 4) In spite of variations from one animal to another, some regularity was observed in the phase of eye velocity modulation. In several cases, a reduction in phase lead of eye velocity with respect to conventional origin of phases (nose-down position) was observed when head velocity increased. 5) Time constant of post-OVAR nystagmus decreased with the tilt angle of the rotation axis from gravity, but not with the orientation of the head with respect to rotation axis. 6) The results could be accounted for by a general equation describing the vestibulo-ocular reflex, provided that estimates of kinematic variables of head movement (head rotational and translational velocities), and visual target distance could be computed by the Central Nervous System.