・Authors: Takao Fukui（福井 隆雄）, Kazuya Inoue（井上 和哉）, Takehiro Komatsu（小松 丈洋）, Nobuya Sato（佐藤 暢哉）

・Title: Kinematic Properties of Haptic-Free Reach-to-Grasp Movements in Virtual Reality: A Comparison with Natural Prehension in Real Spaces and Pantomimed Ones

・Journal(書誌情報）: International Journal of Human–Computer Interaction

・doi: 10.1080/10447318.2024.2399874

・論文URL: https://www.tandfonline.com/doi/full/10.1080/10447318.2024.2399874

・Abstract: Many researchers are interested in how the kinematics of reach-to-grasp movements in virtual reality (VR), which involve the vergence–accommodation conflict, differ from real space. The present study, conducted in VR, verified the effect of a discrepancy between visual and haptic target size and found that terminal haptic feedback is weighted more heavily than visual information, as is the case in real space. Furthermore, we investigated how the presence or absence of terminal haptic feedback modulates performance in VR by comparing prehension with or without terminal haptic feedback in VR, closed-loop natural grasping in real space, and pantomimed prehension with the eyes closed. Our results suggested that the contribution of a visual image to grip aperture adjustment is quite marginal in situations where terminal haptic feedback is unavailable, and that the performance in VR without haptic feedback is highly correlated with performances driven by fully internal representations (i.e., pantomimed movements).

・著者Contact先の email: takao-fukui[at]tmu.ac.jp（[at]を@に変更して下さい。）

・日本語によるコメント：
VR空間内での到達把持動作を実装する際に，把持時のリアルな触覚フィードバックを（簡易な方法で）付与することが技術的に依然難しいため，「視覚イメージのみで把持時の触覚フィードバックがない」という状況が一般的です．本研究では，この視覚イメージのみで把持時の触覚フィードバックがない場合の運動学的特性が，実物体への動作と（そこに物体があるかのようにふるまう）パントマイム動作（ふり動作）のどちらに類似しているかを検討しました．その結果，パントマイム動作に類似しており，把持調節において視覚イメージの寄与が小さいことを明らかにしました．

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