scholarly journals Test-retest reliability of subjective visual vertical measurements with lateral head tilt in virtual reality goggles

2021 ◽  
Vol 0 (0) ◽  
pp. 0
Author(s):  
Tzu-Pu Chang ◽  
Chia-Han Wang ◽  
ArielA Winnick ◽  
Yu-Hung Ko ◽  
Zheyu Wang
Keyword(s):  
Virtual Reality ◽  
Head Tilt ◽  
Subjective Visual Vertical ◽  
Retest Reliability ◽  
Visual Vertical ◽  
Test Retest Reliability ◽  
Lateral Head

Assessment of Subjective Visual Vertical (SVV) Using the “Bucket Test” and the Virtual SVV System

2018 ◽  
Vol 27 (3) ◽  
pp. 249-259 ◽  
Author(s):  
Patricia L. Michelson ◽  
Devin L. McCaslin ◽  
Gary P. Jacobson ◽  
Michelle Petrak ◽  
Lauren English ◽  
...  
Keyword(s):  
Tertiary Care ◽  
Intraclass Correlation ◽  
Subjective Visual Vertical ◽  
Retest Reliability ◽  
Large Tertiary Care ◽  
Visual Vertical ◽  
Virtual System ◽  
The Right ◽  
Test Retest Reliability ◽  
Head Positions

Objective The purpose of this study was to describe the variability and test–retest reliability of a commercially available subjective visual vertical (SVV) system known as Virtual SVV (Interacoustics). In addition, the study aimed to compare the reliability of the Virtual system with a previously established bucket test of SVV. Study Design Fifteen participants with normal hearing, normal middle ear function, and normal utricular function were included in the study. Each participant underwent static SVV testing using both the Virtual system and the bucket test. Subjects completed 2 testing sessions to determine test–retest reliability. For each test, data were collected with the head at 0°, tilted 45° to the right, and tilted 45° to the left. Setting This study was conducted in a balance function laboratory embedded in a large, tertiary care otology clinic. Results The mean SVV values obtained with the Virtual system were within 1°–2° from 0 with the head positioned at 0°, which is in agreement with many other studies of SVV with the head at 0° (Akin & Murnane, 2009; Halmagyi & Curthoys, 1999; Zwergal, Rettinger, Frenzel, Dieterich, & Strupp, 2009). Using the intraclass correlation coefficient, test–retest reliability of the Virtual system was excellent in the 45° left position and fair to good in the 45° right and 0° position. Test–retest reliability of the bucket test was poor in all head positions. Conclusions The Virtual system is a more reliable measure of static SVV than the bucket test. Therefore, the Virtual system could be utilized as a screening device for utricular dysfunction in busy clinical settings.

Normative Data for the Subjective Visual Vertical Test during Centrifugation

2011 ◽  
Vol 22 (07) ◽  
pp. 460-468 ◽  
Author(s):  
Faith W. Akin ◽  
Owen D. Murnane ◽  
Amber Pearson ◽  
Stephanie Byrd ◽  
J. Kip Kelly
Keyword(s):  
Normative Data ◽  
Closed Head Injury ◽  
Inertial Force ◽  
Subjective Visual Vertical ◽  
Cervical Injury ◽  
Retest Reliability ◽  
Test Conditions ◽  
Visual Vertical ◽  
Test Retest Reliability ◽  
Vertical Test

Background: The otoliths act as gravito-inertial force sensors and contribute to the perception of spatial orientation. The perception of gravitational vertical can be assessed by asking a subject to adjust a light bar to the vertical. Prior to clinical use of the SVV (subjective visual vertical) test, normative data and test-retest reliability must be established. Purpose: To obtain normative data and d etermine the test-retest reliability for the SVV test performed in static and dynamic test conditions. Research Design: A descriptive design was used to obtain normative data. Study Sample: Twenty-four young adults with no history of neurological disease, middle-ear pathology, open or closed head injury, cervical injury, or audiovestibular disorder participated in the study. Data Collection and Analysis: The SVV angle was measured in the static position and in three dynamic conditions: (1) on-axis clockwise (CW) rotation, (2) off-axis CW rotation of right ear, and (3) off-axis CW rotation of left ear. Results: In young healthy individuals, the SVV was <2° for static and on-axis rotation, and shifted up to 11° during unilateral centrifugation. Test-retest reliability of the SVV was good for all test conditions. Conclusions: The normative data obtained in this study may be useful in identifying patients with chronic utricular dysfunction. We recommend the use of difference angles (on-axis SVV – off-axis SVV) to remove baseline bias and decrease the variability of the SVV angles for the off-axis conditions.

Subjective visual vertical in virtual reality (Curator SVV): validation and normative data

2018 ◽  
Vol 22 (4) ◽  
pp. 315-320 ◽  
Author(s):  
Elodie Chiarovano ◽  
Leigh A. McGarvie ◽  
David Szmulewicz ◽  
Hamish G. MacDougall
Keyword(s):  
Virtual Reality ◽  
Normative Data ◽  
Subjective Visual Vertical ◽  
Visual Vertical

Head tilt response: A complementary test to the Subjective Visual Vertical

2010 ◽  
Vol 20 (5) ◽  
pp. 381-389 ◽  
Author(s):  
Dario Geisinger ◽  
Enrique Ferreira ◽  
Alejo Suarez ◽  
Hamlet Suarez
Keyword(s):  
Head Tilt ◽  
Subjective Visual Vertical ◽  
Visual Vertical ◽  
Tilt Response

scholarly journals Subjective visual vertical assessment with mobile virtual reality system

Medicina ◽  
2017 ◽  
Vol 53 (6) ◽  
pp. 394-402 ◽  
Author(s):  
Ingrida Ulozienė ◽  
Milda Totilienė ◽  
Andrius Paulauskas ◽  
Tomas Blažauskas ◽  
Vaidotas Marozas ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Subjective Visual Vertical ◽  
Virtual Reality System ◽  
Visual Vertical

Design a Haptic-Combined Virtual Reality System to Improve Box and Block Test (BBT) for Upper Extremity Function Assessment

2020 ◽  
Author(s):  
Ying Dong ◽  
Xiaoyu Liu ◽  
Min Tang ◽  
Hongqiang Huo ◽  
Duo Chen ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Upper Extremity ◽  
Healthy Subjects ◽  
Kinematic Parameters ◽  
Stroke Patients ◽  
Retest Reliability ◽  
Zero Crossings ◽  
Block Test ◽  
Test Retest Reliability ◽  
Function Assessment

Abstract Background: The Box and Block Test (BBT) has been widely used to assess gross upper extremity (UE) motor function. We designed a haptic-combined virtual reality (VR) system, named VBBT, to improve BBT with kinematic parameters for more specific assessments.Methods: According to the block-transfer task in BBT, we designed a VBBT system with a haptic device to provide a sense of the grasping force and block's gravity during task performance for UE function assessment. Besides the number of transferred blocks (N-TB), some kinematic parameters were also collected in VBBT for more specific assessment, including the number of zero-crossings of moving acceleration (NZC-ACC), the number of zero-crossings of derivative of releasing force (NZC-DRF), the ratio of path length and linear length (PLR) and the distance between barrier partition and drop position (DDP). 16 post-stroke patients and 113 healthy subjects were recruited to examine quantitative performances, concurrent validity, test-retest reliability and subjective preference between the BBT and VBBT.Results: Based on the measurements of 95% healthy subjects, the normative ranges of quantitative performances were established for BBT and VBBT. Deficiencies in patients’ UE function could be identified when their measurements fell outsides. A moderate correlation was found in the N-TBs between the VBBT and BBT (r = 0.42). The measurements in VBBT presented a stronger age-related correlation than that in BBT (R2 = 0.57 and R2 = 0.16). The N-TBs in both BBT and VBBT were strongly correlated to the Action Research Arm Test (ARAT) (|r| = 0.84 and 0.83), and the NZC-ACC and NZC-DRF in VBBT also showed significant correlations. (|r| = 0.76 and 0.79). The N-TB, NZC-ACC and NZC-DRF in VBBT showed a good test-retest reliability (ICC = 0.75, 0.78 and 0.80) while a moderate reliability was found in BBT (ICC = 0.62). For the patient preference, VBBT was given a higher score than the BBT (p < 0.05) for its enjoyment and completion effort performing.Conclusion: The VBBT improved a gross manual assessment in BBT, which can provide clinically validated, reliable and motivative assessment with kinematic parameters for specific UE motor functions of post-stroke patients.

scholarly journals Time course of the subjective visual vertical during sustained optokinetic and galvanic vestibular stimulation

2019 ◽  
Vol 122 (2) ◽  
pp. 788-796
Author(s):  
Nynke Niehof ◽  
Florian Perdreau ◽  
Mathieu Koppen ◽  
W. Pieter Medendorp
Keyword(s):  
Time Course ◽  
Head Tilt ◽  
Inertial Force ◽  
Vestibular Stimulation ◽  
Galvanic Vestibular Stimulation ◽  
Constant Current ◽  
Subjective Visual Vertical ◽  
Time Constants ◽  
Visual Vertical ◽  
Over Time

The brain is thought to use rotation cues from both the vestibular and optokinetic system to disambiguate the gravito-inertial force, as measured by the otoliths, into components of linear acceleration and gravity direction relative to the head. Hence, when the head is stationary and upright, an erroneous percept of tilt arises during optokinetic roll stimulation (OKS) or when an artificial canal-like signal is delivered by means of galvanic vestibular stimulation (GVS). It is still unknown how this percept is affected by the combined presence of both cues or how it develops over time. Here, we measured the time course of the subjective visual vertical (SVV), as a proxy of perceived head tilt, in human participants ( n = 16) exposed to constant-current GVS (1 and 2 mA, cathodal and anodal) and constant-velocity OKS (30°/s clockwise and counterclockwise) or their combination. In each trial, participants continuously adjusted the orientation of a visual line, which drifted randomly, to Earth vertical. We found that both GVS and OKS evoke an exponential time course of the SVV. These time courses have different amplitudes and different time constants, 4 and 7 s respectively, and combine linearly when the two stimulations are presented together. We discuss these results in the framework of observer theory and Bayesian state estimation. NEW & NOTEWORTHY While it is known that both roll optokinetic stimuli and galvanic vestibular stimulation affect the percept of vertical, how their effects combine and develop over time is still unclear. Here we show that both effects combined linearly but are characterized by different time constants, which we discuss from a probabilistic perspective.

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