Background: In recent years, virtual reality (VR) has evolved from an alternative to a necessity in older adults for health, medical care, and social interaction. Upper limb (UL) motor skill, is an important ability in manipulating VR systems and represents the brain's regulation of movements using the UL muscles. In this study, we used a haptic-feedback Virtual Box and Block Test (VBBT) system and an Intrinsic Motivation Inventory (IMI) to examine age-related differences in UL motor performance and intrinsic motivation in VR use. The findings will be helpful for the development of VR applications for older adults.
Methods: In total, 48 young and 47 older volunteers participated in our study. The parameters including VBBT score, number of velocity peaks, velocity, grasping force and trajectory length were calculated to represent the task performance, manual dexterity, coordination, perceptive ability and cognitive ability in this study.
Results: Age-related differences could be found in all the parameters (all p < 0.05) in VR use. Regression analysis revealed that the task performance of young adults was predicted by the velocity and trajectory length (R = 64.0%), while that of older adults was predicted by the number of velocity peaks (R = 65.6%). Additionally, the scores of understandability, relaxation and tiredness were significantly different between the two groups (all p < 0.05). In older adults, the understandability score showed large correlation with the IMI score (|r| = 0.576, p < 0.001). In young adults, the correlation was medium (|r| = 0.342, p = 0.017). No significant correlation was found between the IMI score and VBBT score (|r| = 0.142, p = 0.342) in older adults, while a medium correlation (|r| = 0.342, p = 0.017) was found in young adults.
Conclusions: The findings demonstrated that decreased smoothness in motor skills dominated the poor VR manipulation in older adults. The experience of understandability is important for older adults' intrinsic motivation in VR use.
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| http://dx.doi.org/10.1186/s12877-023-03970-7 | DOI Listing |
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