POST-ROTATORY NYSTAGMUS AND OPTOKINETIC AFTER-NYSTAGMUS IN THE RABBIT LINEAR RATHER THAN EXPONENTIAL DECAY
POST-ROTATORY NYSTAGMUS AND OPTOKINETIC AFTER-NYSTAGMUS IN THE RABBIT LINEAR RATHER THAN EXPONENTIAL DECAY
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DOI：
10.1007/bf00237798
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发表时间：
1980-01-01
影响因子：
2
通讯作者：
VANDERSTEEN, J
中科院分区：
文献类型：
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作者：
COLLEWIJN, H;WINTERSON, BJ;VANDERSTEEN, J
在以30 °、60 °和150 °的速度阶跃刺激后，在荷兰兔中测量作为时间函数的旋转后（PRN）和视动后（OKAN）眼球震颤的慢相速度的衰减。S.衰减拟合线性函数非常好，但只有很差的拟合指数。典型的衰变率为2- 5 ℃/min。s2，表观时间常数（定义为衰减到初始速度的37%）为10-20 s。在1只动物中，OKAN和PRN的衰减具有相似的初速度，是无法区分的。对于正弦振荡，根据相位超前估计的前庭眼反射时间常数仅为2-3 s。这可能类似于杯状时间常数。时间常数通常随着眼速的增加而增加。家兔的前庭眼反射表现为一个非线性系统。一个恒定放电率的速度存储系统被假定为主要的非线性元件。这引入了速度的线性衰减和速度阈值。这种储存系统是前庭-眼反射和视动反射所共有的。
The decay of the slow phase velocity of post-rotatory (PRN) and optokinetic (OKAN) after-nystagmus as a function of time was measured in Dutch rabbits after stimulation with velocity steps of 30, 60 and 150.degree./s. The decays fitted linear functions very well, but only poorly fitted exponential ones. Typical decay rates were 2-5.degree./s2, with apparent time constants (defined by decay to 37% of initial velocity) in the order of 10-20 s. Within 1 animal the decays of OKAN and PRN with similar initial velocities were indistinguishable. With sinusoidal oscillation the time constant of the vestibulo-ocular reflex, estimated from phase lead, was only 2-3 s. This was probably similar to the cupular time constant. Time constants usually increased when eye velocities increased. The vestibulo-ocular reflex of the rabbit apparently behaves as a non-linear system. A velocity storage system with a constant discharge rate is postulated as a main non-linear element. This introduces a linear decay of velocity and a threshold for velocity. This storage system is common to vestibulo-ocular and optokinetic reflexes.