Effects of immersion in a virtual tilted reality on verticality representation in healthy subjects
(2023) SOFPEL 2023 (30.November.2023)
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- Introduction Lateropulsion after hemisphere stroke is caused by an impaired internal representation of verticality. Verticality representation could be modified by modulating visual inputs. The present study aimed to influence verticality perception of healthy subjects by immerging them in a tilted virtual reality (VTR). Hypothesis We hypothesized that the immersion in a VTR modulates verticality perception, weight-bearing distribution on lower limbs (WBD) and body orientation. Methods Twenty healthy subjects received 2 sessions of 45 min of immersion in VTR. The first session was devoted to test the effect of VTR on verticality perception (postural vertical [PV] and visual vertical [VV]) and the second session to test the effect of VTR on body orientation (measured with inertial captors) and WBD (measured by posturography). Primary outcome was PV. Results: VTR immersion significantly modulated PV and VV orientations (p<0.001), with a large effect size (r=0.69-0.85), both oriented to the side of the VTR. WBD was also significantly changed after VTR immersion (p<0.001), with a large effect size (r=0.76). Participants increased their support on the lower limb to the side of the VTR (+2.47%). Conclusion: Immersion of 45 min in VTR modulated healthy subject’s verticality perception (PV and VV orientations) and also WBD. Those results suggest that VTR could be a promising tool to recalibrate biased verticality perception after stroke in order to improve postural disorders.
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Dehem, S. (2023). Effects of immersion in a virtual tilted reality on verticality representation in healthy subjects. SOFPEL 2023. https://hdl.handle.net/2078.5/26888