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OPTOKINETIC NYSTAGMUS (OKN) EYE-MOVEMENT MEDIATED BY DIRECT AND INDIRECT PATHWAYS
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- Author:
- No author available
- Journal Title:
- ACTA PHYSIOLOGICA SINICA
- Issue:
- 3
- DOI:
- 10.3321/j.issn:0371-0874.1998.03.002
- Key Word:
- 视动震颤;眼球运动;开环控制;闭环控制;猫
Abstract： 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.
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