Visual Stabilization of Balance in Virtual Reality Using the HTC Vive

Kelly, Jonathan W.; Klesel, Brenna; Cherep, Lucia A.

doi:10.1145/3313902

Cited by 10 publications

(4 citation statements)

References 31 publications

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“…The results of the GEE analysis were consistent with previous studies showing that the impact of changing stance width was larger than that of changing visual conditions [26,33]. As the base of support decreases, the role of somatosensory input increases, especially when the visual system is not effective for postural control [24,30]. This was reflected by a significant interaction effect between tandem and one-leg standing tasks and VrS and BS conditions based on the GEE analysis.…”

Section: Discussionsupporting

confidence: 88%

“…A reduced RQ is considered to reflect a low visual dependence for postural stabilization [25]. One study documented a reduced RQ with viewing a virtual environment through the HTC VIVE than did the real environment [30]. This supports the notion that immersion in VR may decrease the visual dependency of postural control, and that adaptation to visual-vestibular conflict increases the contribution of vestibular and somatosensory inputs to postural control by ignoring the conflicting delayed visual input in the VE [31].…”

Section: Introductionmentioning

confidence: 83%

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The Effects of Visual Backgrounds in the Virtual Environments on the Postural Stability of Standing

Liang

Chi

Chen

et al. 2021

IEEE Trans. Neural Syst. Rehabil. Eng.

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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 oneleg 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 taskdependent. 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.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 83%

The Effects of Visual Backgrounds in the Virtual Environments on the Postural Stability of Standing

Liang

Chi

Chen

et al. 2021

IEEE Trans. Neural Syst. Rehabil. Eng.

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“…To help occupants avoid physical injuries induced by nonstructural components, a virtual earthquake safety drill based on the above constructed earthquake scene (see Figure 12) is performed. In this drill, HTC Vive [41] is employed to enable the trainee experiences such scene, because it can use a widely used API, OpenVR [42], to easily connect to Unity. By using HTC Vive, the framework of the virtual drill is implemented, as shown in Figure 15.…”

Section: Virtual Earthquake Safety Drillmentioning

confidence: 99%

Virtual Scene Construction for Seismic Damage of Building Ceilings and Furniture

Zhang

Wei

et al. 2019

Applied Sciences

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A valid seismic damage scene for indoor nonstructural components is critical for virtual earthquake safety drills which can teach occupants how to survive in earthquakes. A virtual scene construction method for the seismic damage of suspended ceilings and moveable furniture is proposed based on FEMA P-58 and a physics engine. First, a modeling framework is designed based on building information modeling (BIM) to create consistent structural and scene models for the subsequent structural time-history analysis (THA) and scene construction. Subsequently, FEMA P-58 is employed to determine the damage states of nonstructural components based on the results of the THA. Finally, the physical models on the movements of the damaged components are designed using a physics engine and are also validated through the experiments such as an existing shaking table test. Considering a six-story building as a case study, a virtual earthquake scene of the indoor nonstructural components is constructed and applied in an earthquake safety drill. The outcome of this study provides well-founded scenes of the seismic damage to indoor nonstructural components for performing virtual earthquake safety drills.

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“…The authors also suggest a clinical application of these perturbations as their findings demonstrate that motor control strategies can be challenged by optic flow perturbations without physically perturbing the subject ( Heidner et al, 2020 ). Yet, past investigations provided rational that balance control in VR is per se compromised with respect to the real environment ( Horlings et al, 2009 ; Kelly et al, 2019 ). Therefore, one could argue that postural instability induced by moving room paradigms is not solely due to the optic flow perturbations, but also a consequence of the VR itself.…”

Section: Discussionmentioning

confidence: 99%

Sinusoidal Optic Flow Perturbations Reduce Transient but Not Continuous Postural Stability: A Virtual Reality-Based Study

et al. 2022

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Optic flow perturbations induced by virtual reality (VR) are increasingly used in the rehabilitation of postural control and gait. Here, VR offers the possibility to decouple the visual from the somatosensory and vestibular system. By this means, it enables training under conflicting sensorimotor stimulation that creates additional demands on sensory reweighting and balance control. Even though current VR-interventions still lack a well-defined standardized metric to generate optic flow perturbations that can challenge balance in a repeatable manner, continuous oscillations of the VR are typically used as a rehabilitation tool. We therefore investigated if continuous sensory conflicts induced by optic flow perturbations can challenge the postural system sustainably. Eighteen young adults (m = 8, f = 10, age = 24.1 ± 2.0 yrs) were recruited for the study. The VR was provided using a state-of-the-art head-mounted display including the virtual replica of the real environment. After familiarization in quiet stance without and with VR, bipedal balance was perturbed by sinusoidal rotations of the visual scenery in the sagittal plane with an amplitude of 8° and a frequency of 0.2 Hz. Postural stability was quantified by mean center of mass speed derived from 3D-kinematics. A rmANOVA found increased postural instability only during the first perturbation cycle, i.e., the first 5 s. Succeeding the first perturbation cycle, visual afferents were downregulated to reduce the destabilizing influence of the sensory conflicts. In essence, only the transient beginning of sinusoidal oscillation alters balance compared to quiet standing. Therefore, continuous sinusoidal optic flow perturbations appear to be not suitable for balance training as they cannot trigger persisting sensory conflicts and hence challenge the postural system sustainably. Our study provides rationale for using unexpected and discrete optic flow perturbation paradigms to induce sustainable sensory conflicts.

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Visual Stabilization of Balance in Virtual Reality Using the HTC Vive

Cited by 10 publications

References 31 publications

The Effects of Visual Backgrounds in the Virtual Environments on the Postural Stability of Standing

The Effects of Visual Backgrounds in the Virtual Environments on the Postural Stability of Standing

Virtual Scene Construction for Seismic Damage of Building Ceilings and Furniture

Sinusoidal Optic Flow Perturbations Reduce Transient but Not Continuous Postural Stability: A Virtual Reality-Based Study

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