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Study of action control using vector analysis of surrounding space

利用周围空间矢量分析的动作控制研究

基本信息

批准号：
11671682
负责人：
TAKAHASHI Masahiro
金额：
$ 2.3万
依托单位：
Tokai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

Tilting of the head during rotation produces strange sensation, body sways and nystagmus when examined in the dark. However, these phenomena are not evoked in the dark. The difference may be simply explained supposing a vector of surrounding outer world in the brain. The present study was done to answer following questions : a) whether the difference between vision and non-vision conditions hold good at fast rotations; b) how far adaptation proceeds by repetitive stimuli; c) whether training effects are different between vision and non-vision conditions; d) whether adaptation against Coriolis stimulation fits the hypothesis of vector analysis. In 1999, we modified a computer-controlled rotating chair into a rotating platform. In 2000, we investigated success rates of stance during Coriolis stimulation at different speeds. Although success rates differed between vision and non-vision conditions at 50 deg/s, they did not differ at 70 deg/s and faster speeds. In 2001, we studied training effects with (N=10) and without vision (N=10) on rotating velocities for successful stance and nature of acquired standing abilities. After daily 20-min-long training with Coriolis stimulation, more than half of the subjects could stand at 200 deg/s irrespective of visual condition. Reversed rotation after training degraded stance similarly as before training. In contrast, stance against lateral tilting was almost equal to forward tilting after training. We summarize the present study as follows, a) stance became quickly adapted itself to Coriolis stimulation; b) maximum rotation speed far exceeds 200 deg/s; c) vision does not influence training effect; d) adaptation of spatial orientation to Coriolis stimulation may be explained by a transfer of reference frame from stationary space to rotating space.

旋转时头部倾斜会产生奇怪的感觉，当在黑暗中检查时，身体会摇摆和眼球震颤。然而，这些现象在黑暗中不会被诱发。这种差异可以简单地解释，假设大脑中有一个周围外部世界的向量。本研究旨在回答以下问题：（a）视觉和非视觉条件的差异是否在快速旋转中保持良好;（B）重复刺激的适应程度如何;（c）视觉和非视觉条件的训练效果是否不同;（d）对科里奥利刺激的适应是否符合向量分析假设。1999年，我们将一个电脑控制的旋转椅改造成了一个旋转平台。2000年，我们调查了不同速度科里奥利刺激期间站立的成功率。虽然在50度/秒的速度下，有视觉和无视觉条件下的成功率不同，但在70度/秒和更快的速度下没有差异。在2001年，我们研究了训练效果（N=10）和没有视觉（N=10）的旋转速度成功的立场和获得的站立能力的性质。在每天20分钟的科里奥利刺激训练后，超过一半的受试者可以在200度/秒的速度下站立，而不管视觉条件如何。训练后的反向旋转降低了站姿，与训练前相似。相反，训练后，对抗侧倾的站立几乎等于前倾。我们总结了目前的研究如下：a）站姿迅速适应科里奥利刺激; B）最大旋转速度远远超过200度/秒; c）视觉不影响训练效果; d）空间定向对科里奥利刺激的适应可以通过参考系从静止空间转移到旋转空间来解释。