摘要
研究了家兔闭环及开环状态的ＯＫＮ反应。闭环时，ＯＫＮ眼动速度与刺激速度成正比，增益接近１。当固定受刺激眼形成开环状态时，ＯＫＮ眼动速度远大于刺激速度，增益可达１０２左右，说明ＯＫＮ系统是由运动跟踪的负反馈机制控制的；刺激范围缩小则眼动反应减弱，表明ＯＫＮ系统对运动信息具有空间总和作用；以视野中不同高度的局部刺激时，发现视网膜中央视带比周边部对ＯＫＮ刺激的敏感性高；单光点刺激视带中央可诱发出清楚的ＯＫＮ反应，这为临床上应用ＯＫＮ客观测定视网膜功能和运动感知提供了可能性。
The optokinetic nystagmus of rabbit were investigated. In close loop condition, the eye-movement velocity was directly proportional to the velocity of stimulus, and the gain of the OKN was approximately equal to one. In open loop condition, the eye movement velocity was considerably larger than the velocity of stimulus and the maximum gain of the open loop OKN reached about 100; it indicates that the OKN system is controlled by a negative feedback mechanism of hacking movement. The OKN response decreased while the stimulus field was reduced; it means that there is a spatial summation mechanism of moving information in rabbit OKN system. A narrow horizontal zone in the central part of the visual field was high sensitive to stimulus, the OKN response can be evoked by a single moving spot when located within that central part of the visual streak. So it is possible that the retinal function and the movement perecption of the visual system could be diagnosed by the local OKN Which is elicited by the local small stimulus in open loop conditionn.
出处
《生物物理学报》
CAS
CSCD
北大核心
1996年第1期91-96,共6页
Acta Biophysica Sinica
基金
国家自然科学基金
