Development of moving visual stimulation method for linear acceleration experiment using a virtual reality graphic display

内耳中的耳石器官既感知重力又感知线加速度，因此它对体位的变化很敏感。人体的位置信息也是通过视觉系统和前庭视觉系统共同获得的。我们开发了一个视动刺激模式，这是由虚拟现实计算机图形（CG），并打算结合联合收割机的视觉和前庭刺激使用线性加速设备（雪橇）安装在名古屋大学。(1)1995年至1996年，主要研究课题是实现与雪橇运动相配合的虚拟现实刺激模式。(2)在由软件制造商准备CG期间，进行另一个主题，以便检查线性加速度对姿势再调整响应的影响。当雪橇被驱动与受试者身体的前后正弦运动时，swayd与驱动加速度的大小成比例。(3)澄清说 ...更多信息 在0.04G和0.06G时，姿势控制有两种类型，即在0.02G ~ 0.04G时，以踝关节策略为主，在0.06G ~ 0.08G时，以髋关节策略为主。在0.06G以上的较高G下，头部运动是固定和稳定的。(4)颈部和下肢肌肉的活动也证实了这一现象。作为一种可能的解释，前庭颈反射以及前庭脊髓反射进行了讨论。(5)1996年至1997年进行的下一个实验是研究CG产生的视动刺激对站立姿势的影响。视动刺激引起了受试者的自我运动知觉（向量），同时引起了与视觉刺激相对应的身体摇摆。(6)该模型定义为：运动矢量首先产生头部运动，然后由头部运动触发身体摆动。(7)遗憾的是，在本项目期间，由于名古屋大学的雪橇使用受到严重限制，我们无法使用新开发的虚拟现实视动刺激实验进行雪橇实验。少

The otolith organ in the inner ear perceives both the gravity and linear acceleration, so it is susceptible to the change of body position. Information of the body position gets also according to visual system together with the vestibular one. We developed an optokinetic stimulation pattern which was drawn up by a virtual reality computer graphics (CG), and intended to combine visual and vestibular stimulation using a linear acceleration equipment (sled) installed at Nagoya University. (1) From 1995 through 1996, main research subject was to accomplish the virtual reality stimulation patterns, which acted in cooperation with movement of the sled. (2) During preparing CG by a soft-ware maker, the other subject was proceeded, so that it was to examine an effect of linear acceleration on the postural readjustment response. When the sled was driven with a sinusoidal motion of fore and back to subject body swayd in proportion to a magnitude of driven acceleration. (3) It was clarified that … More two types of the postural control were distinguished between 0.04G and 0.06G.Namely, in 0.02G to 0.04G the postural readjustment was controlled by an ankle strategy, and in 0.06G to 0.08G a hip strategy was dominated. Head movement was fixed and stabilized at the higher G above 0.06G.(4) These phenomena were also proved by the muscle activities of the neck and under extremity muscles. As a possible explanation, the vestibulo-collic as well as the vestibulo-spinal reflexes were discussed. (5) The next experiment performed in 1996 to 1997 was to study effects of optokinetic stimulation produced by the CG on the standing posture. The optokinetic stimulation caused a self-motion perception (vection) to the subject, and simultaneously provoked a body sway corresponded with the visual stimulation. (6) It was defined that the vection produced firstly head movement and then the body sway which was triggered by the head movement. (7) Unfortunately, during the term of this project we could not conduct the sled experiment by using a newly developed virtual reality optokinetic stimulation experiment owing to severe restriction of utilization of the sled of Nagoya University. Less