伸長する腕に対する身体性の獲得：伸長実装法による違い

抄録

We aimed to investigate whether illusory embodiment occurs in arms that stretch farther than usual arms in a virtual environment and how embodiment is acquired in different stretching methods. We realized three types of arm stretching methods: the hand extended ten times the actual movement (constant stretching), the hand extended in an accelerated manner (accelerated stretching), and the hand immediately extended to the target when the user fixed the eyes on the target and moved the hand towards the target (instant stretching). Then, we investigated sense of body ownership, sense of agency and task performance for those. We found that the illusory body ownership and sense of agency were higher in the order of constant stretching, accelerated stretching, and instant stretching. The learning effects on embodiment depended on the stretching method. Task performance was better in the order of constant, instant, and accelerated stretching. These results suggest that the illusory embodiment of the stretching arm and its learning depend on the type of stretching.