The contribution of the vibrotactile stimulation to the mirror illusion D Tajima1, T Mizuno2, Y Kume3, T Yoshida1 |
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1Dept. of Mechanical Sciences and Engineering, Tokyo Institute of Technology, Japan |
| When people view their left hand in a mirror positioned along the midsagittal plane while moving both hands synchronously, the hand in the mirror visually captures the right hand self-sensation. We visualized the critical distance between the real and the reflected hand to evoke this illusion by utilizing a position sensor and machine learning. The estimated offset area was a 10 × 20 ellipse around the reflected hand’s position; we tested the effect of the efferent signal on the illusion based on this estimate. Vibro-tactile stimulation was used at the fingertip to evoke force-like sensation and apparent finger movement as in the Pinocchio illusion [Mizuno et al, 2010, The Virtual Reality Society of Japan, 15(4), 595-601]. The mirror illusion was still observed with apparent finger movements. When this stimulation was conducted synchronously with actual movements, 3 out of 12 participants felt the illusion almost anywhere within their reach. Whether these findings derive from the terminal vibration or from other factors (e.g. the apparent finger movement sensation) is unclear. However, the efferent copy is likely just one type of multimodal feedback that generates physical sensation; subjective matching with more than two modalities can be a benefit to capture self-body sensation. |
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