Lee Hye Jin, Lee Jaedong, Kim Chi Jung, Kim Gerard J, Kim Eun-Soo, Whang Mincheol
Department of Emotion Engineering, Graduate School, Sangmyung University, 7 Hongji-dong, Jongro-Ku, Seoul 110-743, Korea.
College of Information and Communications, Korea University, Anam-dong 5-ga, Seongbuk-gu, Seoul 136-791, Korea.
Sensors (Basel). 2015 Apr 1;15(4):7913-32. doi: 10.3390/s150407913.
"Out of the body" tactile illusion refers to the phenomenon in which one can perceive tactility as if emanating from a location external to the body without any stimulator present there. Taking advantage of such a tactile illusion is one way to provide and realize richer interaction feedback without employing and placing actuators directly at all stimulation target points. However, to further explore its potential, it is important to better understand the underlying physiological and neural mechanism. As such, we measured the brain wave patterns during such tactile illusion and mapped out the corresponding brain activation areas. Participants were given stimulations at different levels with the intention to create veridical (i.e., non-illusory) and phantom sensations at different locations along an external hand-held virtual ruler. The experimental data and analysis indicate that both veridical and illusory sensations involve, among others, the parietal lobe, one of the most important components in the tactile information pathway. In addition, we found that as for the illusory sensation, there is an additional processing resulting in the delay for the ERP (event-related potential) and involvement by the limbic lobe. These point to regarding illusion as a memory and recognition task as a possible explanation. The present study demonstrated some basic understanding; how humans process "virtual" objects and the way associated tactile illusion is generated will be valuable for HCI (Human-Computer Interaction).
“出体”触觉错觉是指在没有任何刺激器的情况下，人们能够感知到仿佛来自身体外部某个位置的触觉的现象。利用这种触觉错觉是在不直接在所有刺激靶点处使用和放置致动器的情况下提供和实现更丰富交互反馈的一种方式。然而，为了进一步探索其潜力，更好地理解其潜在的生理和神经机制很重要。因此，我们测量了这种触觉错觉期间的脑电波模式，并绘制出相应的大脑激活区域。参与者在不同水平上接受刺激，目的是在沿着外部手持虚拟尺子的不同位置产生真实（即非错觉）和幻肢感觉。实验数据和分析表明，真实感觉和错觉感觉都涉及顶叶，顶叶是触觉信息通路中最重要的组成部分之一。此外，我们发现，对于错觉感觉，存在额外的处理过程，导致事件相关电位（ERP）延迟，并涉及边缘叶。这些表明将错觉视为一种记忆和识别任务可能是一种解释。本研究展示了一些基本认识；人类如何处理“虚拟”物体以及相关触觉错觉产生的方式对于人机交互（HCI）将是有价值的。
