Post-stroke Unilateral Spatial Neglect: Virtual Reality-based Navigation and Detection Tasks Reveal Lateralized and Non-lateralized Deficits in Tasks of Varying Perceptual and Cognitive Demands
Overview
Neurology
Rehabilitation Medicine
Affiliations
Background: Unilateral spatial neglect (USN), a highly prevalent and disabling post-stroke impairment, has been shown to affect the recovery of locomotor and navigation skills needed for community mobility. We recently found that USN alters goal-directed locomotion in conditions of different cognitive/perceptual demands. However, sensorimotor post-stroke dysfunction (e.g. decreased walking speed) could have influenced the results. Analogous to a previously used goal-directed locomotor paradigm, a seated, joystick-driven navigation experiment, minimizing locomotor demands, was employed in individuals with and without post-stroke USN (USN+ and USN-, respectively) and healthy controls (HC).
Methods: Participants (n = 15 per group) performed a seated, joystick-driven navigation and detection time task to targets 7 m away at 0°, ±15°/30° in actual (visually-guided), remembered (memory-guided) and shifting (visually-guided with representational updating component) conditions while immersed in a 3D virtual reality environment.
Results: Greater end-point mediolateral errors to left-sided targets (remembered and shifting conditions) and overall lengthier onsets in reorientation strategy (shifting condition) were found for USN+ vs. USN- and vs. HC (p < 0.05). USN+ individuals mostly overshot left targets (- 15°/- 30°). Greater delays in detection time for target locations across the visual spectrum (left, middle and right) were found in USN+ vs. USN- and HC groups (p < 0.05).
Conclusion: USN-related attentional-perceptual deficits alter navigation abilities in memory-guided and shifting conditions, independently of post-stroke locomotor deficits. Lateralized and non-lateralized deficits in object detection are found. The employed paradigm could be considered in the design and development of sensitive and functional assessment methods for neglect; thereby addressing the drawbacks of currently used traditional paper-and-pencil tools.
Virtual reality gameplay classification illustrates the multidimensionality of visuospatial neglect.
Painter D, Norwood M, Marsh C, Hine T, Woodman C, Libera M Brain Commun. 2024; 6(4):fcae145.
PMID: 39165478 PMC: 11333965. DOI: 10.1093/braincomms/fcae145.
Uimonen J, Villarreal S, Laari S, Arola A, Ijas P, Salmi J Front Psychol. 2024; 15:1319944.
PMID: 38348259 PMC: 10860750. DOI: 10.3389/fpsyg.2024.1319944.
Painter D, Norwood M, Marsh C, Hine T, Harvie D, Libera M J Neuroeng Rehabil. 2023; 20(1):161.
PMID: 37996834 PMC: 10668447. DOI: 10.1186/s12984-023-01283-9.
Jang W, Hwang H, Kim J Brain Sci. 2023; 13(6).
PMID: 37371430 PMC: 10295946. DOI: 10.3390/brainsci13060952.
Houston K, Keilty M, Collins C, Trehan R, Mouldovan T, Stuckart K Arch Rehabil Res Clin Transl. 2023; 5(1):100246.
PMID: 36968165 PMC: 10036222. DOI: 10.1016/j.arrct.2022.100246.