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首页> 外文会议>2018 IEEE Conference on Virtual Reality and 3D User Interfaces >Inducing Compensatory Changes in Gait Similar to External Perturbations Using an Immersive Head Mounted Display
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Inducing Compensatory Changes in Gait Similar to External Perturbations Using an Immersive Head Mounted Display

机译：使用沉浸式头戴式显示器诱导类似于外部干扰的步态补偿性变化

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Understanding the sensorimotor control mechanisms that mediate gait compensation during environmental perturbation is a crucial step in developing tailored rehabilitative therapies to restore ambulation in patient populations. Current methods to evaluate the effects of environmental perturbations involve costly systems that physically perturb patients to elicit a compensatory response. Studies have shown that visual feedback alone can elicit dramatic changes in gait; however, the impact of fully immersive visual feedback is not well studied. Here we examined whether a low cost immersive virtual reality (VR) system can elicit perturbation responses similar to a physical disruption. We examined the responses of 11 subjects as they walked through a VR environment consisting of a bridge spanning a lake. While subjects walked on a treadmill mounted to a 6 degree-of-freedom motion base, pseudorandom roll perturbations (3, 6, 11 deg.) were applied visually to the bridge with (VP trials) and without (V trials) the corresponding physical displacement of the motion base. Significant differences were found between normal (unperturbed) walking and normal walking in the VR environment (p<.05) for average step length, width, and Margin of Stability (MoS). Significant differences were also observed between unperturbed and perturbed walking in the VR environment (p<0.05 for VP and V trials). While the subjects' responses to visual perturbations were generally lower than to combined visual and physical perturbations, the differences were not statistically significant (p>.05). The results demonstrate that visual perturbations provided in an immersive virtual environment can induce compensatory changes in gait during treadmill walking that are consistent with a physical perturbation. The application of environmental perturbations in VR systems could provide a cost-effective approach for gait rehabilitation in patient populations.
机译：理解在环境扰动期间介导步态补偿的感觉运动控制机制是开发定制的康复治疗方法以恢复患者活动的关键步骤。当前评估环境扰动影响的方法涉及昂贵的系统，该系统会物理扰动患者以引起代偿性反应。研究表明，单独的视觉反馈会引起步态的剧烈变化。但是，对完全沉浸式视觉反馈的影响还没有很好的研究。在这里，我们检查了低成本的沉浸式虚拟现实（VR）系统是否可以引发类似于物理中断的扰动响应。我们检查了11名受试者穿越VR环境（由横跨湖面的桥梁组成）时的反应。当受试者在装有6自由度运动基座的跑步机上行走时，通过（VP试验）和不使用（V试验）将相应的身体进行视觉上的伪随机横摇摄动（3、6、11度）应用于桥梁运动基座的位移。发现正常（无干扰）行走与VR环境中的正常行走之间存在显着差异（p <.05），平均步长，宽度和稳定性裕度（MoS）均不同。在VR环境中，无干扰步行和无干扰步行之间也观察到了显着差异（VP和V试验的p <0.05）。尽管受试者对视觉扰动的反应通常低于对视觉和身体的综合扰动，但差异无统计学意义（p> .05）。结果表明，在沉浸式虚拟环境中提供的视觉干扰可以在跑步机行走过程中引起步态的补偿性变化，这与物理干扰一致。在VR系统中应用环境扰动可以为患者人群的步态康复提供一种经济有效的方法。

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