Wang Guoyao, Wang Wenjie, Wang Zhuang, Huang Shuaifei, Liu Yuan, Ming Dong
Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, 300072, People's Republic of China.
Haihe Laboratory of Brain-computer Interaction and Human-machine Integration, Tianjin, 300000, People's Republic of China.
Sci Rep. 2025 Apr 3;15(1):11447. doi: 10.1038/s41598-025-96377-w.
Recently, the sixth finger illusion has been widely studied for body representation. It remains unclear how the stroking area, visual effects and the number of trials affect the illusion. We recruited 80 participants to conduct five trials by stroking the palm outside or little finger outside in conditions with and without wearing supernumerary rubber finger. The results show the stroking area has a greater impact on the intensity and independence of the illusion. And the palm outside can induce a stronger and more independent illusion. In addition, the sixth finger illusion induced by these four conditions was significantly influenced by the number of trials, and there is a significant enhancement in the intensity of the illusion induced by the palm outside as the number of trials increases. These indicate that stroking the outer lateral side of the palm can induce a relatively stronger and more independent sixth finger illusion, and the intensity of it reaches a steady state after three trials when wearing a supernumerary rubber finger and five trials when not wearing a supernumerary rubber finger. This study adds evidence to the research on multisensory integration and sensory feedback of the supernumerary robotic fingers.
最近，第六指错觉已被广泛用于身体表征研究。目前尚不清楚抚摸区域、视觉效果和试验次数如何影响这种错觉。我们招募了80名参与者，在佩戴和不佩戴额外橡胶手指的条件下，通过抚摸手掌外侧或小指外侧进行了五次试验。结果表明，抚摸区域对错觉的强度和独立性有更大影响。而且手掌外侧能诱发更强、更独立的错觉。此外，这四种条件诱发的第六指错觉受试验次数的显著影响，随着试验次数增加，手掌外侧诱发的错觉强度有显著增强。这些表明，抚摸手掌外侧能诱发相对更强、更独立的第六指错觉，佩戴额外橡胶手指时三次试验后其强度达到稳定状态，不佩戴额外橡胶手指时五次试验后达到稳定状态。本研究为超数机器人手指的多感官整合和感觉反馈研究增添了证据。
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