Yu Imaoka

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Imaoka

First Name

Yu

ORCID

0000-0002-3236-5579

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Publications 1 - 10 of 11

Triggering Postural Movements With Virtual Reality Technology in Healthy Young and Older Adults: A Cross-Sectional Validation Study for Early Dementia Screening
Imaoka, Yu; Saba, Nadja; Vanhoestenberghe, Anne; et al. (2020)
Frontiers in Medicine
With the ultimate aim of early diagnosis of dementia, a new body balance assessment system with integrated head-mounted display-based virtual reality (VR) has been developed. We hypothesized that people would sway more in anterior-posterior (AP) direction when they were exposed to a VR environment where we intentionally provoked movements in forward and backward directions. A total of 14 healthy older adults (OA) (73.14±4.26 years) and 15 healthy young adults (YA) (24.93±1.49 years) were assessed for group differences in sway behavior. Body sway speed in 22 different conditions with and without VR environments was analyzed. Significant differences and large effect sizes were observed in AP sway under the VR environments (OA with P < 0.02; effect size> 0.61, YA with P < 0.003; effect size> 0.72) compared to the baseline condition without the VR environments. In addition, significant differences were found between the two groups in AP sway in all test conditions (P < 0.01). Our study shows that a VR environment can trigger body sway in an expected direction, which may indicate that it is possible to enhance the sensitivity of balance assessment by integrating immersive VR environments. The result of this study warrants a cross-sectional study in which OA diagnosed with and without dementia are compared on their sway behavior.
Development of a body balance assessment system with integrated virtual reality technology; construct validity testing in healthy older adults
Imaoka, Yu; Saba, Nadja; Vanhoestenberghe, Anne; et al. (2019)
Simultaneous assessment of posture and saccadic eye movement with visual stimuli using head-mounted display virtual reality technology in healthy older adults
Imaoka, Yu; Flury, Andri; de Bruin, Eling (2021)
Alzheimer's & Dementia: The Journal of the Alzheimer's Association
A concurrent assessment system of body balance and eye movement with head-mounted display virtual reality technology for dementia screening
Imaoka, Yu; Flury, Andri; de Bruin, Eling (2020)
Concurrent Assessment of Posture and Saccades with Visual Stimulation using Virtual Reality Technology; Construct Validity Testing in Healthy Older Adults
Imaoka, Yu; Flury, Andri; de Bruin, Eling (2021)
XXVIII Congress of the International Society of Biomechanics (ISB). Program & Abstracts
Development of a Body Balance Assessment System with Integrated Virtual Reality Technology; Construct Validity Testing in Healthy Older Adults
Imaoka, Yu; Saba, Nadja; Vanhoestenberghe, Anne; et al. (2019)
Investigation of effect of different virtual reality environments on saccadic eye movement: Construct validity testing in healthy older adults
Imaoka, Yu; Flury, Andri; de Bruin, Eling (2020)
Gait & Posture
Development and investigation of a novel concurrent comprehensive assessment system of posture and eye movements, using virtual reality technology
Imaoka, Yu (2021)
Effects of different virtual reality technology driven dual-tasking paradigms on posture and saccadic eye movements in healthy older adults
Imaoka, Yu; Flury, Andri; Hauri, Laura; et al. (2022)
Scientific Reports
Postural sway and eye movements are potential biomarkers for dementia screening. Assessing the two movements comprehensively could improve the understanding of complicated syndrome for more accurate screening. The purpose of this research is to evaluate the effects of comprehensive assessment in healthy older adults (OA), using a novel concurrent comprehensive assessment system consisting of stabilometer and virtual reality headset. 20 healthy OA (70.4 ± 4.9 years) were recruited. Using a cross-sectional study design, this study investigated the effects of various dual-tasking paradigms with integrated tasks of visuospatial memory (VM), spatial orientation (SO), and visual challenge on posture and saccades. Dual-task paradigms with VM and SO affected the saccadic eye movements significantly. Two highly intensive tests of anti-saccade with VM task and pro-saccade with SO task also influenced postural sway significantly. Strong associations were seen between postural sway and eye movements for the conditions where the two movements theoretically shared common neural pathways in the brain, and vice versa. This study suggests that assessing posture and saccades with the integrated tasks comprehensively and simultaneously could be useful to explain different functions of the brain. The results warrant a cross-sectional study in OA with and without dementia to explore differences between these groups.
Linking cognitive functioning and postural balance control through virtual reality environmental manipulations
Imaoka, Yu; Hauri, Laura; Flury, Andri; et al. (2022)
Frontiers in Aging Neuroscience
Background: Dementia is becoming a relevant problem worldwide. A simple screening at an early stage will be important to detect the risk of developing dementia. Vestibular dysfunction is likely to be associated with cognitive impairment. Since head-mounted display (HMD) virtual reality (VR) technology has the potential to activate the vestibular function, assessing postural sway with visual stimulation using HMD VR technology could be potentially useful for dementia screening. Objective: The purpose of this study is to evaluate the effect of HMD-based VR visual stimuli on posture in older adults and the relationship between the stimulated body sway behaviors and cognitive performance. Method: Using a cross-sectional study design, we investigated the effect of an optokinetic design-based room with stripes (OKR) VR environment oscillating forwards and backwards at 23/60Hz. Center of pressure (COP) displacement was measured in older adults aged 65 years and over in the OKR VR environment. The frequency response of COP was compared to the cognitive performance of the Montreal Cognitive Assessment (MoCA). Results: 20 healthy older adults (70.4 ± 4.9 years; 27.2 ± 1.6 MoCA score) and 3 people with mild cognitive impairment (74.7 ± 4.0 years; 20.3 ± 2.1 MoCA score) were assessed. The results reveal that the oscillating OKR VR environment induced different postural sway in the anterior-posterior direction in the real world. Correlation analysis shows that the cognitive test score was associated with the frequency response of stimulated postural sway in the anterior-posterior direction (frequency Band 1 of 0−0.5Hz related to the visual and vestibular systems: rs = 0.45, P = 0.03). Conclusion: Outcomes would suggest that a potential link may emerge between cognition and posture when the HMD-based VR visual stimuli are applied. The simple screening of stimulated postural sway could explain cognitive functioning. Further studies are warranted to clarify the vestibular system and spatial cognitive function more specifically in the proposed assessment system.

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Yu Imaoka

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