IDIBAPS (Institut de Investigacions Biomèdiques August Pi i Sunyer), Barcelona, Spain ; EVENT Lab, Departament de Personalitat, Avaluació i Tractaments Psicològics, Facultat de Psicologia, Universitat de Barcelona, Campus de Mundet, Edifici Teatre, Passeig de la Vall d'Hebron 171, 08035 Barcelona, Spain.
IDIBAPS (Institut de Investigacions Biomèdiques August Pi i Sunyer), Barcelona, Spain ; EVENT Lab, Departament de Personalitat, Avaluació i Tractaments Psicològics, Facultat de Psicologia, Universitat de Barcelona, Campus de Mundet, Edifici Teatre, Passeig de la Vall d'Hebron 171, 08035 Barcelona, Spain ; ICREA (Institut Catalá de Recerca i Estudis Avançats), Barcelona, Spain.
Cogn Neurodyn. 2012 Aug;6(4):295-305. doi: 10.1007/s11571-011-9178-5. Epub 2011 Oct 27.
When a rubber hand is placed on a table top in a plausible position as if part of a person's body, and is stroked synchronously with the person's corresponding hidden real hand, an illusion of ownership over the rubber hand can occur (Botvinick and Cohen 1998). A similar result has been found with respect to a virtual hand portrayed in a virtual environment, a virtual hand illusion (Slater et al. 2008). The conditions under which these illusions occur have been the subject of considerable study. Here we exploited the flexibility of virtual reality to examine four contributory factors: visuo-tactile synchrony while stroking the virtual and the real arms, body continuity, alignment between the real and virtual arms, and the distance between them. We carried out three experiments on a total of 32 participants where these factors were varied. The results show that the subjective illusion of ownership over the virtual arm and the time to evoke this illusion are highly dependent on synchronous visuo-tactile stimulation and on connectivity of the virtual arm with the rest of the virtual body. The alignment between the real and virtual arms and the distance between these were less important. It was found that proprioceptive drift was not a sensitive measure of the illusion, but was only related to the distance between the real and virtual arms.
当一只橡胶手被放置在桌面的一个合理位置，好像是人体的一部分，并与被试者隐藏的真实手同步进行触摸时，就会产生对橡胶手的所有权错觉（Botvinick 和 Cohen 1998）。在虚拟环境中描绘的虚拟手或虚拟手错觉（Slater 等人，2008）中也发现了类似的结果。这些错觉发生的条件是相当多研究的主题。在这里，我们利用虚拟现实的灵活性来检验四个促成因素：在虚拟和真实手臂上同步进行触摸时的视觉触觉同步性、身体连续性、真实手臂和虚拟手臂之间的对齐度以及它们之间的距离。我们总共在 32 名参与者中进行了三项实验，其中这些因素都有所变化。结果表明，对虚拟手臂的主观所有权错觉以及唤起这种错觉的时间高度依赖于同步的视觉触觉刺激以及虚拟手臂与虚拟身体其余部分的连接性。真实手臂和虚拟手臂之间的对齐度和它们之间的距离就不那么重要了。研究发现，本体感觉漂移不是错觉的敏感测量指标，而是仅与真实手臂和虚拟手臂之间的距离有关。
