IEEE Trans Haptics. 2023 Apr-Jun;16(2):240-250. doi: 10.1109/TOH.2023.3266432. Epub 2023 Jun 20.
Funneling illusion refers to a midway perceived illusory tactile sensation between multiple distant stimulations. Since haptic illusion provides guidelines to simplify tactile interfaces, funneling illusion has been explored on different parts of human skin. This study aimed to evaluate the perceptual localization performance of vibrotactile funneling illusion on palmar side of the hand. It is based on the idea of leveraging the vibrotactile funneling illusion to produce distributed vibrotactile stimuli across the entire hand using only a few vibration actuators. By designing a glove with actuators on five fingertips and the palm heel, we measured the localization density of funneling illusion on the whole hand in two experimental conditions [one-dimensional (1D) illusion along each finger and 2D illusion on palmar plane]. The results showed that the average correct rate of location discrimination was 97%, 82%, and 71% in 3-, 4-, and 5-location densities for 1D illusion and 85%, 70%, and 58% in 11-, 16-, and 21-location densities for 2D illusion, respectively. These findings confirmed the feasibility of simulating multi-location stimuli using only a few actuators. Also, perceptual guidelines were provided for the designing of vibrotactile gloves by leveraging the entire hand funneling illusion.
漏斗幻觉是指在多个远距离刺激之间感知到的中途幻觉触觉。由于触觉幻觉为简化触觉界面提供了指导，因此已经在人体皮肤的不同部位探索了漏斗幻觉。本研究旨在评估手的掌侧上振动漏斗幻觉的感知定位性能。它基于利用振动漏斗幻觉的想法，使用几个振动致动器在整个手上产生分布式振动触觉刺激。通过在手背和五个指尖上设计带有致动器的手套，我们在两种实验条件下测量了漏斗幻觉在整个手上的定位密度[沿每个手指的一维（1D）幻觉和手掌平面上的 2D 幻觉]。结果表明，在 1D 幻觉的 3、4 和 5 位置密度下，位置辨别率的平均正确率分别为 97%、82%和 71%，在 2D 幻觉的 11、16 和 21 位置密度下，正确率分别为 85%、70%和 58%。这些发现证实了仅使用几个致动器模拟多个位置刺激的可行性。此外，通过利用整个手的漏斗幻觉，为设计振动触觉手套提供了感知指南。
