A photorealistic scene in a head mount display (HMD) is considered high fidelity and associated with postural stability similar to that in the real world, but the effects of visual background under different standing conditions have not been examined. Thirty-four healthy adults performed four standing (standardized, narrow, tandem and one-leg) tasks in three scenes with an HMD, while viewing one of three scenes: a real room (real scene, RS), a photorealistic scene (VrS) and a blank scene (BS). The effects of the visual scenes and standing tasks on sway parameters were analyzed. Romberg quotients (RQs) of the sway parameters were compared between RS and VrS with reference to BS to compare visual contribution to posture stability. Sway parameters were similar during all three scenes during the standardized and narrow standing tasks, but higher in VrS and BS conditions than in the RS condition during the tandem and one-leg standing tasks. The effects of visual scenes on postural stability showed a significant interaction with the standing tasks. The BS/VsR and BS/RS ratios were close to 1.0 for the standardized and narrow standing tasks, and the magnitude of increase was lower for BS/VsR than BS/RS during the tandem and one-leg standing tasks, indicating different levels of visual dependence. The effects of virtual scenes on postural stability were task-dependent. Adjusting the amount of visual stimuli and choosing tasks with higher postural demands may result in synergic effects, but the influence of visual environments should be examined with consideration of visual targeting.

中文翻译：

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虚拟环境中视觉背景对站立姿势稳定性的影响


头戴式显示器 (HMD) 中的逼真场景被认为具有高保真度，并且与类似于现实世界中的姿势稳定性相关，但尚未检查不同站立条件下视觉背景的影响。三十四名健康成年人使用 HMD 在三个场景中执行四项站立（标准化、狭窄、串联和单腿）任务，同时观看三个场景之一：真实房间（真实场景，RS）、照片级真实场景 (VrS)和一个空白场景（BS）。分析了视觉场景和站立任务对摇摆参数的影响。参考 BS 比较 RS 和 VrS 之间的摇摆参数的 Romberg 商 (RQ)，以比较视觉对姿势稳定性的贡献。在标准化和狭窄站立任务期间，所有三个场景中的摇摆参数相似，但在串联和单腿站立任务期间，VrS 和 BS 条件下的摇摆参数高于 RS 条件下的摇摆参数。视觉场景对姿势稳定性的影响显示出与站立任务的显着交互作用。对于标准化和窄幅站立任务，BS/VsR 和 BS/RS 比率接近 1.0，并且在串联和单腿站立任务中 BS/VsR 的增加幅度低于 BS/RS，表明不同水平的视觉依赖性。虚拟场景对姿势稳定性的影响取决于任务。调整视觉刺激量和选择姿势要求较高的任务可能会产生协同效应，但应在考虑视觉目标的情况下检查视觉环境的影响。