Researchers have studied the discrimination thresholds between different vibrotactile signals under various conditions. Humans cannot recognize slight differences in vibrotactile stimuli that are smaller than the perception threshold. This is a constraint in the vibrotactile design used in practical applications. This article focuses on the vibrational feedback at the “edge” between multiple areas, while previous studies have not considered this. We assume that the edge vibration not only emphasizes the presence of the edge itself, but also has an effect on the vibrotactile perception of the adjoining areas. Specifically, we hypothesize that the edge vibration would modify the user's ability to discriminate vibrotactile differences between adjoining areas. We conducted a user study to test this hypothesis. As a result, we found that presenting edge vibrations at the boundaries between adjacent textures makes it easier to discriminate the frequency and amplitude differences of the vibrations of those uneven textures. This article could increase the flexibility of vibrotactile design, and vibrotactile designers could use these results to design a wider variety of vibrations for adjacent areas.

中文翻译：

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边缘振动提高了区分相邻区域粗糙度差异的能力

研究人员研究了不同条件下不同振动触觉信号之间的辨别阈值。人类无法识别小于感知阈值的振动触觉刺激的细微差异。这是在实际应用中使用的振动触觉设计中的一个约束。本文重点关注多个区域之间“边缘”处的振动反馈，而之前的研究并没有考虑到这一点。我们假设边缘振动不仅强调边缘本身的存在，而且对相邻区域的振动触觉感知也有影响。具体来说，我们假设边缘振动会改变用户区分相邻区域之间振动触觉差异的能力。我们进行了一项用户研究来检验这一假设。因此，我们发现在相邻纹理之间的边界处呈现边缘振动可以更容易区分那些不均匀纹理的振动的频率和幅度差异。这篇文章可以增加振动触觉设计的灵活性，振动触觉设计师可以利用这些结果为相邻区域设计更多种类的振动。