Study of the Impact of Visual and Haptic Sensory Sensitivities on the Detection of Visuo-Haptic Illusions in Virtual Reality

Visuo-haptic illusions enhance the user experience in virtual reality when physical resources are limited. In order to tailor these illusions to individual user characteristics, we argue in this paper that quantifying users' visual and proprioceptive sensitivities is essential. We thus present a method - comprising an experimental protocol and Bayesian analysis - for capturing human visual and proprioceptive sensitivity in virtual reality. Our findings demonstrate that 1) in accordance with existing literature, the visual modality is more precise in the azimuthal direction, and proprioceptive precision is higher in depth; 2) the visual and proprioceptive precisions achieved in VR are of a similar magnitude, in contrast to real-world literature results; 3) it is possible to categorize participants based on their proprioceptive and visual precisions. These results will serve as a foundation for studying the impact of human sensitivities on the perception of visuo-haptic illusions.