Study on improvement of eye-head coordination pattern by means of target tracking in hemianoptic agnosia.

在26名对照组和5名部分失明偏瘫患者中，记录了在跟踪平滑移动的视觉目标时眼睛和头部的运动。对照组的眼球和头部运动表现出与跳眼运动相同的协调模式。：眼球运动开始于头部运动之前，且速度高于头部运动。因此，眼睛到头轴的角位移大于头到身体轴的角位移。但随后，头部转动速度逐渐加快，眼球转动速度减慢，以保持注视点在目标上。最后，眼球运动被逆转（代偿性眼球运动）。与有手追踪的跟踪相比，头部的角位移小于无手追踪的跟踪。人们认为头部旋转被抑制了。这个实验的结果可以通过假设前庭输入必须被精确地控制来解释。同型偏盲患者的眼球和头部运动描述如下：1。在对照组中，眼睛和头部的运动也显示出类似的模式。2. 眼睛和头部的旋转幅度与对照组不同。当同向偏视患者在视野丧失一侧追逐运动目标时，眼球转动速度减慢，头部相应加速以维持注视位置。3. 与对照组相比，他们的眼球运动受到更频繁的干扰。4. 当用手追踪时，五分之一的人在对照组中表现出类似的模式。剩下的4个没有变化。5. 虽然眼球运动变得平稳和准确，但更频繁地错过目标。6. 从这些结果来看，同型偏盲已经学会了扩展动态视野。用手追踪可以刺激神经系统，使眼-头协调程序。因此，康复训练方案最好在这些过程中制定。研究结果分别发表在science journal(1)和congress(2)上。

Eye and head movements during tracking of smoothly moving visual target were recorded in 26 controls and 5 partially blinded humans with hemiplegia.Eye and head movements in controls showed coordinated pattern which had been found in saccadic movement.: The eye movement started before head moved and the velocity was higher than head. Therefore,the angular displacement of eye to head axis became larger than head to body axis. However, later, the head rotation speeded up gradually and the eye rotation speeded down for keeping the gaze point on the target. Finallly, eye movement was reversed (compensatory eye movement).When compared with tracking with hand pursuit, angular displacement of head was smaller than without hand pursuit. It was thought that head rotation was suppressed. The result of this experiment can be explained best by postulating that vestibular input must be controlled for a precise gaze.Eye and head movements in homonymous hemianopsias are described below.1. The eye and head movements showed similar pattern in controls. 2. Amplitude of the eye and head rotation was different from controls. When homonymous hemianopsias pursued a moving target to the side of visual field loss, the eye rotation decelerated and correspondingly, the head accelerated in order to maintain the gaze position. 3. And the eye movement was disturbed more frequently than in controls. 4. When tracking with hand pursuit, one of 5 showed simillar pattern in controlls. The remaining 4 did not change. 5. While the eye movement became smooth and accurate, but missed the target more frequently. 6. From these results, the homonymous hemianopsias already have learned to expand the dynamic visual field. Tracking with hand pursuit may stimulate the nervous system making the eye-head coordintion program. Therefore, training program for rehabilitation had better make on these process. These results were reported in scientific journal(1) and congress(2).