Dataset for finger motion and contact by a second finger influence the tactile perception of electrovibration

Electrovibration holds great potential for creating vivid and realistic haptic sensations on touchscreens. Ideally, a designer should be able to control what users feel independent of the number of fingers they use, the movements they make, and how hard they press. We sought to understand the perception and physics of such interactions by determining the smallest 125 Hz electrovibration voltage that fifteen participants could reliably feel when performing four different touch interactions at two normal forces. The results proved for the first time that both finger motion and contact by a second finger significantly affect what the user feels. At a given voltage, a single moving finger experiences much larger fluctuating electrovibration forces than a single stationary finger, making electrovibration much easier to feel during interactions involving finger movement. Indeed, only about 30% of participants could detect the stimulus without motion. Part of this difference comes from the fact that relative motion greatly increases the electrical impedance between a finger and the screen, as shown via detailed measurements from one individual. In contrast, threshold-level electrovibration did not significantly affect the coefficient of kinetic friction in any conditions. These findings help lay the groundwork for delivering consistent haptic feedback via electrovibration.

Methods
The Methods section of the manuscript gives detailed explanations of the data collection and process. The dataset includes raw and processed data, all the relevant codes, and a text file explaining code and data.

电振动（Electrovibration）在触摸屏上生成生动逼真的触觉感知方面具有巨大潜力。理想状态下，设计师应当能够独立于用户使用的手指数量、手部动作以及按压力度，精准调控用户所感知到的触觉效果。本研究旨在通过测定15名参与者在两种法向压力下完成4种不同触摸交互时可可靠感知的最小125Hz电振动电压，探究此类交互的感知机制与物理特性。研究结果首次证实，手指运动以及第二根手指的接触均会显著影响用户的触觉感知。在相同电压下，移动的单根手指所感受到的电振动力波动幅度远大于静止的单根手指，这使得在带有手指运动的交互中，电振动更易被感知。实际上，仅有约30%的参与者能够在无运动的情况下检测到该刺激。此类差异部分源于相对运动极大提升了手指与屏幕间的接触阻抗，这一点通过对一名受试者的详细测量得到了验证。与之相反，阈值级别的电振动在任何条件下均不会对动摩擦系数产生显著影响。上述发现为通过电振动实现稳定一致的触觉反馈奠定了基础。

方法
本文的方法章节详细阐释了数据收集与处理流程。本数据集包含原始数据与经处理后的数据、全部相关代码，以及一份用于说明代码与数据使用方式的文本文件。