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.

为了研究眼头配位在头部旋转过程中的动态视敏度（DVA）的贡献，我在两个实验后进行了我进行的。体验I：正常受试者（n = 84）被要求读取和回答3个数字，以随机顺序呈现。在自愿向右旋转期间，数字以90度/s向右移动。进行了30次试验，并将正确答案的数量（完整得分； 3 x 30 = 90）评估为DVA得分。其DVA评分的平均值和SD为37.0和7.8。体验II：六个正常受试者在两周内重复了与上述相同的试验。三名受试者每天进行125次试验（HT组），另外三名受试者每天进行25次试验（LT组）。 HT组的DVA得分从39.7增加到50.3。同样，在LT组中，该组从41.3增加到52.3。但是，自愿性头运动随后进行了DVA训练的变化完全取决于主题组。尽管LT组的峰值头速度从62.1降低到30.1度/s，但HT组的峰值速度显然增加了43.3度增加到79.0度/s。 LT组的策略似乎是合理的，因为在这种头部条件下，向左眼运动被认为是由VOR唤起的，VOR打扰了跟踪移动目标。 HT组的策略如何？ HT组的主题OZ数据给了我一个很大的提示。他的头部轮换可能会提前开始，因此在移动目标出现时处于减速阶段。因此，我认为向左的加速度唤起了右眼的运动。我将这个想法命名为“逆转假设”。根据这一假设，向右和右手追求使高速向右凝视速度。的确，Oz的受试者显示出80度/s向右的凝视速度，这不能仅通过追踪眼动作来解释。这种“逆转假设”具有为更好的DVA做出有效训练方式的可能性。