Jeune Francois Le, D'Alonzo Marco, Noccaro Alessia, Raiano Luigi, Formica Domenico, Pino Giovanni Di
Annu Int Conf IEEE Eng Med Biol Soc. 2020 Jul;2020:3248-3251. doi: 10.1109/EMBC44109.2020.9176659.
The Rubber Hand Illusion can be used to induce the illusion that a fake hand is part of one's own body. Thus, it can be used to alter the body representation. It was also reported that the Rubber Hand Illusion induces a proprioceptive drift of one's real hand toward the fake hand. The Rubber Hand Illusion can be induced when the fake hand is placed farther in the sagittal plane (distally) compared to the real hand. In this case, the induced update of the body representation is an elongation of the arm. Virtual Reality and haptic technologies can be used to manipulate the perceived scenario in a virtual version of the Rubber Hand Illusion, the Virtual Hand Illusion. We developed a novel platform consisting in a virtual reality application integrating an optical motion capture device and haptic stimulators to study the manipulation of the body representation. We developed two experimental protocols to induce embodiment of an elongated arm: one validated in previous studies, that employs congruent visuo-motor-tactile stimulation, and one reproducing the typical Virtual Hand Illusion where only congruent visuo-tactile stimulation was employed. We tested both protocols with healthy participants.
橡皮手错觉可用于诱导出一种假手是自己身体一部分的错觉。因此，它可用于改变身体表征。据报道，橡皮手错觉还会导致真实手部向假手产生本体感觉漂移。当假手相对于真实手在矢状面（远端）放置得更远时，就会诱发橡皮手错觉。在这种情况下，身体表征的诱发更新是手臂的伸长。虚拟现实和触觉技术可用于在橡皮手错觉的虚拟版本——虚拟手错觉中操纵感知场景。我们开发了一个新颖的平台，该平台由一个集成了光学运动捕捉设备和触觉刺激器的虚拟现实应用组成，用于研究身体表征的操纵。我们制定了两个实验方案来诱导长臂的身体化：一个在先前研究中得到验证，采用一致的视觉 - 运动 - 触觉刺激，另一个再现典型的虚拟手错觉，其中仅采用一致的视觉 - 触觉刺激。我们用健康参与者对这两个方案都进行了测试。
