复合运动条纹刺激下的视动震颤(OKN)眼动反应

OPTOKINETIC NYSTAGMUS INDUCED BY MOVING COMPOUND GRATINGS

研究视动震颤（optokineticnystagmus，OKN）眼动系统在同时包含两个二维运动的复合运动条纹（movingcompoundgratings）刺激下的反应特性，并探讨两种子条纹（componentgrating）运动方向的夹角和运动速度的影响。实验结果发现，在一定参数范围内，复合运动条纹引起了双重交替OKN反应，即OKN交替地跟踪合成运动（coherence）和分别运动（transparency）；在跟踪分别运动中，又是交替地跟踪两种子条纹的运动。实验结果还发现，随着两种子条纹运动方向的夹角减小、速度减小，OKN反应跟踪合成运动的时间增加；其中夹角的影响是决定性的。

Optokinetic Nystagmus (OKN ) induced by moving compound gratings was investigated. It was found that OKN sometimes tracks the coherent motion of the rigid plaid in a single direction, and sometimes tracks alternately the transparent motion of two component gratings in different directions, as Dual Altemate OKN. It was also found that the duration of OKN tracking coherence increases as the moving speed of the component gratings d creases, and as the angle between their moving directions decreases. The results also showed that the effect of angle plays a dominant role.