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Strategy of eye-head coordination for better dynamic visual acuity

眼头协调策略以获得更好的动态视力

基本信息

批准号：
16500420
负责人：
WADA Yoshiro
金额：
$ 2.43万
依托单位：
Nara Medical University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

To investigate the contribution of eye-head coordination for dynamic visual acuity (DVA) during head rotation, I performed following two experiments.Experiment I : Normal subjects (n=84) were asked to read and answer 3 numerals, presented sequentially at random order. The numerals moved rightward at 90 deg/s on a CRT monitor during voluntary rightward rotation. Thirty trials were carried out and numbers of correct answers (full score ; 3 x 30 = 90) were evaluated as DVA score. Mean and SD of their DVA score was 37.0 and 7.8.Experiment II : Six normal subjects repeated the same trial as above for two weeks. Three subjects conducted 125 trials a day (HT group) and another three ones did 25 trials a day (LT group). DVA score in HT group increased from 39.7 to 50.3. Similarly, that in LT group increased from 41.3 to 52.3. The changes of voluntary head motion followed by DVA training, however, completely depended on the subject group. Although the peak head velocity in LT group decreased from 62.1 to 30.1 deg/s, that in HT group apparently increased 43.3 to 79.0 deg/s. The strategy of LT group seems to be reasonable because in this head condition leftward eye movements are thought to be evoked by VOR, which disturbs tracking a moving target. How is the strategy of HT group? Data of subject OZ in HT group gave me a big hint. His head rotation could make an early start and was consequently in deceleration stage when a moving target appeared. Therefore, I considered that leftward acceleration evoked rightward eye movements as VOR. I named this idea "reversal VOR hypothesis". According this hypothesis, rightward VOR and rightward pursuit made a high-speed rightward gaze velocity. Indeed, subject OZ showed 80 deg/s rightward gaze velocity, which can not be explained by only pursuit eye movements.This "reversal VOR hypothesis" holds the possibility of making effective training way for better DVA.

为了探讨头旋转过程中眼-头协调对动态视敏度（DVA）的影响，我们进行了两个实验：实验一：正常被试（n=84）被要求阅读并回答3个数字，数字顺序为随机顺序。数字在CRT显示器上以90度/秒的速度在自主旋转过程中以90度/秒的速度移动。进行了30次试验，并将正确答案的数量（满分; 3 x 30 = 90）作为DVA评分进行评价。实验二：6名正常人重复上述实验，持续两周。3名受试者每天进行125次试验（HT组），另外3名受试者每天进行25次试验（LT组）。HT组的DVA评分从39.7增加到50.3。同样，LT组从41.3增加到52.3。然而，DVA训练后自主头部运动的变化完全取决于受试者组。LT组的头峰速度从62.1度/秒下降到30.1度/秒，HT组的头峰速度则明显增加43.3度/秒到79.0度/秒。LT组的策略似乎是合理的，因为在这种头部条件下，人眼运动被认为是由VOR引起的，它干扰了对移动目标的跟踪。HT集团的战略是什么？HT组受试者OZ的数据给了我一个很大的提示。他的头部旋转可以提前开始，因此在移动目标出现时处于减速阶段。因此，我认为，垂直加速度引起的单眼运动是VOR。我把这个想法命名为“反转VOR假说”。根据这一假设，视觉跟踪和视觉追踪产生了一个高速的视觉注视速度。事实上，受试者OZ显示了80度/秒的注视速度，这不能仅仅用追踪眼球运动来解释。