Effect of side-down tilt on optokinetic nystagmus and optokinetic after-nystagmus in cats
Effect of side-down tilt on optokinetic nystagmus and optokinetic after-nystagmus in cats
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DOI：
10.1016/j.neures.2003.11.007
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发表时间：
2004-03-01
影响因子：
2.9
通讯作者：
Sato, Y
中科院分区：
文献类型：
--
作者：
Kitama, T;Luan, HG;Sato, Y
本实验观察了猫在侧倾状态下视动性眼震（OKN）和后眼震（OKAN）的慢相速度（SPV）。在直立位时，OKN的SPV轴（SPV向量方向）总是靠近刺激轴。侧位时，偏航刺激诱发OKN，其矢量偏离刺激轴向俯仰轴方向，使SPV旋转平面向地平面偏移，俯仰轴刺激诱发OKN矢量方向不变。这种偏航到俯仰的交叉耦合在性质上与先前在灵长类动物中描述的相似。当刺激轴垂直定向时，偏航刺激期间的SPV矢量大小最大，并且当刺激在重力方向上时，矢量大小小于当刺激在反重力方向上时。快速上升反应的SPV矢量没有显示出明显的变化与头部方向，表明直接视动通路没有贡献的交叉耦合的诱导。在OKAN过程中也发现了交叉偶联。SPV轨迹拟合良好，使用速度存储积分器模型。猫OKN/OKAN的SPV矢量变化可以通过改变模型中的增益元素来拟合。(C)2003年爱思唯尔爱尔兰有限公司和日本神经科学学会。All rights reserved.
Slow phase velocity (SPV) of optokinetic nystagmus (OKN) and after-nystagmus (OKAN) was examined in the cat in side-down tilts. In the upright position, the axis of SPV (direction of SPV vector) during OKN was always close to the stimulus axis. In side-down positions, yaw stimulation induced OKN with the vector deviating from the stimulus axis toward the pitch-axis, so as to make the SPV rotational plane be shifted toward the earth horizontal plane, while pitch-axis stimulation induced no change in vector direction. This yaw-to-pitch cross-coupling is qualitatively similar to that previously described in primates. SPV vector size during yaw stimulation is greatest when the stimulus axis is oriented vertically, and the vector size is smaller when the stimulus is in the gravity direction than when it is in the anti-gravity direction. The SPV vector for the rapid-rise response showed no clear change with head orientation, indicating that the direct optokinetic pathway has no contribution to the induction of cross-coupling. Cross-coupling was found also during OKAN. The SPV trajectories were fitted well using the velocity storage integrator model. SPV vector change of cat OKN/OKAN in head tilt could be fitted by changing gain elements in the model. (C) 2003 Elsevier Ireland Ltd and The Japan Neuroscience Society. All rights reserved.