İzmir University of Economics, Department of Psychology, İzmir, Turkey.
İzmir University of Economics, Department of Psychology, İzmir, Turkey.
Conscious Cogn. 2021 May;91:103108. doi: 10.1016/j.concog.2021.103108. Epub 2021 Mar 23.
Previous studies showed that the vestibular system is crucial for multisensory integration, however, its contribution to bodily self-consciousness more specifically on full-body illusions is not well understood. Thus, the current study examined the role of visuo-vestibular conflict on a full-body illusion (FBI) experiment that was induced during a supine body position. In a mixed design experiment, 56 participants underwent through a full-body illusion protocol. During the experiment, half of the participants received synchronous visuo-tactile stimulation, and the other half received asynchronous visuo-tactile stimulation, while their physical body was lying in a supine position, but the virtual body was standing. Additionally, the contribution of individual sensory weighting strategies was investigated via the Rod and Frame task (RFT), which was applied both before (pre-FBI standing and pre-FBI supine) and after the full-body illusion (post-FBI supine) protocol. Subjective reports of the participants confirmed previous findings suggesting that there was a significant increase in ownership over a virtual body during synchronous visuo-tactile stimulation. Additionally, further categorization of participants based on their visual dependency (by RFT) showed that those participants who rely more on visual information (visual field dependents) perceived the full-body illusion more strongly than non-visual field dependents during the synchronous visuo-tactile stimulation condition. Further analysis provided not only a quantitative demonstration of full-body illusion but also revealed changes in perceived self-orientation based on their field dependency. Altogether, findings of the current study make further contributions to our understanding of the vestibular system and brought new insight for individual sensory weighting strategies during a full-body illusion.
先前的研究表明，前庭系统对于多感觉整合至关重要，然而，其对于躯体自我意识的贡献，特别是对于全身错觉，尚不清楚。因此，本研究在仰卧位时检查了视-前庭冲突对全身错觉（FBI）实验的作用。在混合设计实验中，56 名参与者进行了全身错觉实验。在实验过程中，一半的参与者接受同步的视触刺激，另一半接受异步的视触刺激，而他们的身体躺在仰卧位，而虚拟身体站立。此外，通过杆框任务（RFT）研究了个体感觉权重策略的贡献，该任务在全身错觉实验前后（FBI 站立前和 FBI 仰卧前、FBI 仰卧后）进行。参与者的主观报告证实了之前的研究结果，表明在同步视触刺激期间，对虚拟身体的所有权显著增加。此外，进一步根据他们的视觉依赖性（通过 RFT）对参与者进行分类，结果表明，在同步视触刺激条件下，那些更多地依赖视觉信息的参与者（视觉场依赖者）比非视觉场依赖者更强烈地感知到全身错觉。进一步的分析不仅提供了全身错觉的定量证明，还根据他们的视觉依赖性揭示了感知自我定向的变化。总之，本研究的结果进一步加深了我们对前庭系统的理解，并为全身错觉期间个体感觉权重策略提供了新的见解。
