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经直接与间接通路的视动震颤(OKN)眼动反应

杨东生, 孙复川

中国科学院上海生理研究所；中国科学院生物物理所视觉信息加工开放实验室

摘要

采用鼻向及颞向运动光栅图形刺激猫的半侧视网膜，以探讨鼻侧半视网膜至视束核（NOT）的视动震颤（OKN）直接通路及颞侧半视网膜经皮层至NOT的间接通路对OKN眼动反应的神经控制特性。实验结果显示：高速度刺激的闭环OKN反应及开环OKN反应均对鼻向运动刺激有明显的方向选择性；半侧视网膜刺激时，鼻侧半视网膜的鼻向OKN增益明显高于颞侧半视网膜的鼻向增益，说明猫的OKN眼动反应以跟踪鼻向运动为主，并且这种对鼻向运动刺激的选择性主要来源于鼻侧半视网膜，亦即来源于OKN直接通路；颞侧半视网膜的鼻、颞向眼动增益均明显低于鼻侧半视网膜的鼻向眼动增益，说明猫的OKN系统的间接通路在OKN眼动控制中起辅助作用，并可能主要对颞向OKN眼动起作用从而与双眼视觉功能相关。

关键词： 视动震颤; 眼球运动; 开环控制; 闭环控制; 猫

Cui Hong

First Clinical Institute，China Medical University. Shenyang 110001,Liaoning, China

Abstract

Nasal or temporal side of the cat's retina was stimulated with nasalward and temporalward moving petterns for investigating the neural control of the optokinetic nystagmus in the direct and indirect pathways of OKN. The experimental data demonstrated that there was a nasalward directional preference in oath OKN system under both close loop and open loop conditions, and the nasalward OKN gain evoked by stimulation of nasal retina was much higher than that at temporal retina. ms indicates that OKN nasalward preference is mairily derived from the nasal retina, i. e. the direct path1Vay of OKN dominates the indirect pathway in cat's OKN system. The gains of temporalward and nasalward OKN from temporal retina are much less than those of nasalward OKN from nasal retina. It is suggested that the indirect pathway of OKN in the cat only possesses a supplementary function, Which probably plays an important role in temporalward OKN eye-movments in relation to binocular vision.

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引用本文：

杨东生, 孙复川. 经直接与间接通路的视动震颤(OKN)眼动反应[J]. 生理学报 1998; 50 (3): .

Cui Hong. . Acta Physiol Sin 1998; 50 (3): (in Chinese with English abstract).