School of Psychology, University of Reading Malaysia, Iskandar Puteri, Malaysia.
Faculty of Cognitive Science and Human Development, Cognitive Science Program, University Malaysia Sarawak, Kuching, Malaysia.
Exp Brain Res. 2019 Jul;237(7):1821-1832. doi: 10.1007/s00221-019-05539-6. Epub 2019 May 11.
The rubber hand illusion (RHI) is a perceptual phenomenon in which participants experience ownership over a fake model hand through synchronous visuotactile stimulation. Several studies have shown that the illusion occurs only when both hands are in close proximity to each other. In the present study, we systematically examined the role of relative position (lateral, distal) and distance (13-75 cm) of the model hand (with respect to participants' real hand) on illusion experience across both lateral and distal positions. Furthermore, we also compared different facets of the subjective illusion experience; the experience of the model hand being part of one's body (i.e., ownership) and the perceptual fusion of vision and touch (i.e., referral of touch). In two experiments we observed indications for a stronger illusion experiences in distal compared to lateral positions of identical distances, indicating that the illusory effects may vary as a function of the relative position of the hand. Our results also showed that manipulations of distance differently modulated both facets of the illusion. While ownership was restricted to near distances, referral of touch sensations remained stable at farther distances. These results are interpreted in relation to variations in sensory weighting across different planes.
橡胶手错觉（RHI）是一种知觉现象，参与者通过同步的视触刺激体验到对假模型手的所有权。多项研究表明，只有当两只手彼此非常接近时，这种错觉才会发生。在本研究中，我们系统地研究了模型手（相对于参与者的真实手）的相对位置（横向、远端）和距离（13-75 厘米）在横向和远端位置对错觉体验的作用。此外，我们还比较了主观错觉体验的不同方面；模型手成为身体一部分的体验（即所有权）和视觉与触觉的感知融合（即触觉的定位）。在两个实验中，我们观察到在相同距离的远端位置比横向位置的错觉体验更强的迹象，这表明错觉效应可能随手的相对位置而变化。我们的结果还表明，距离的操纵分别调制了错觉的两个方面。虽然所有权仅限于近距离，但是触觉的定位在更远的距离保持稳定。这些结果与不同平面上的感觉加权变化有关。
