Does vestibular nystagmus obey the Listing's law?

列氏定律的存在是为了降低眼球运动的自由度，以便更容易地控制眼球运动。眼睛沿着轴运动，它存在于平面上，李斯特的平面，垂直于视觉轴通过眼球的中心。警觉状态下的眼球运动遵循这一规律，但在前庭眼球震颤中没有明确的证据表明这一规律。本研究的目的是阐明列氏法对前庭眼球震颤的作用。为了无创记录眼球运动，我们使用了自己开发的视频图像分析系统。然而，标准视频图像由30帧/秒组成。这种采样率不足以记录和分析眼球的快速运动。因此，我们开发了四倍高速摄像机，即采样率为120hz。我们用这台高速摄像机研究了快速眼球运动，并取得了一些不错的结果。然而，对于分析快速眼动，即使这样的采样率仍然很低。然后我们开发了速度更快的摄像机。本摄像机的采样率为240hz。使用这个高速CCD相机，我们可以精确地记录快速的眼球运动，扫视。首先，我们对正常扫视进行了研究，在这些受试者中发现了清晰的李氏平面。最后，利用热量刺激、冰水灌洗单侧耳，诱发前庭眼球震颤，并记录分析这些视频图像，由大腿速度CCD摄像机采集。通过本实验，列氏定律与前庭眼球震颤之间的关系逐渐清晰。

Listing's law exists for reducing the degree of freedom of the eye movements, in order to control the movement more easily. The eye moves along the axis, which exists on the plane, Listing's plane, perpendicular to the visual axis through the center of eyeball. The eye movements during the alert state obey this law, but there is no clear evidence of this law regarding the vestibular nystagmus. The purpose of this study is to clarify the role of the listing's law on the vestibular nystagmus. For recording the eye movement non-invasively, we used the video mage analysis system developed by us. However, standard video image is consisted by 30 frames/sec. This sampling rate is not adequate to record and analyze the rapid eye movements. Therefore, we developed the four times high-speed camera, which means the sampling rate is 120 Hz. We investigated rapid eye movements using this high-speed camera and we have got some good result. However, for analyzing the rapid eye movement, even this sampling rate is still low. Then we developed much higher speed video camera. The sampling rate of this camera is 240 Hz. Using this high speed CCD camera, we can record rapid eye movements, saccade, precisely. First of all, we studied normal saccade, and found clear Listing's plane in these subjects. Finally, the caloric stimulation, iced water irrigation to the unilateral ear, is used to evoke the vestibular nystagmus, and record and analyzed these video images, which captured by thigh speed CCD camera. From this experiment, some relationship between the Listing's law and the vestibular nystagmus coming clear.