Thin Films on the Skin, but not Frictional Agents, Attenuate the Percept of Pleasantness to Brushed Stimuli.
Thin Films on the Skin, but not Frictional Agents, Attenuate the Percept of Pleasantness to Brushed Stimuli.
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DOI：
10.1109/whc49131.2021.9517259
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发表时间：
2021-07
期刊：
影响因子：
--
通讯作者：
Gerling GJ
中科院分区：
文献类型：
--
作者：
Rezaei M;Nagi SS;Xu C;McIntyre S;Olausson H;Gerling GJ
当以一定的速度轻触触接收器的皮肤表面时，被刷过的刺激被认为是愉快的。虽然刷刷速度和愉悦度之间的关系已被广泛复制，但我们并不了解由此产生的皮肤运动——例如，横向拉伸、粘滑、正常压痕——是如何促使我们形成这样的判断的。在一系列的心理物理实验中，这项工作通过改变刺激强度和采用各种治疗方法来调节皮肤运动。刺激包括三个硬度等级的刷子和一个没有戴手套的人的手指。皮肤的摩擦是通过非危险化学品和洗涤方案来调节的，皮肤的厚度和横向运动是通过薄的胶膜来调节的。这些刺激物是在控制的力和速度下用手刷的。人类参与者使用比例缩放法报告每次试验的感知愉悦度。结果表明，刷子的硬度比任何皮肤处理都更能影响愉悦感。令人惊讶的是，改变皮肤的摩擦并不影响愉悦感。但是，弹性薄膜的应用调制性较好。这种屏障虽然有弹性，厚度只有40微米，但却抑制了皮肤的切向运动，分散了正常的力量。薄膜调节情感相互作用的发现对可穿戴传感器和驱动设备具有启示意义。
Brushed stimuli are perceived as pleasant when stroked lightly on the skin surface of a touch receiver at certain velocities. While the relationship between brush velocity and pleasantness has been widely replicated, we do not understand how resultant skin movements – e.g., lateral stretch, stick-slip, normal indentation – drive us to form such judgments. In a series of psychophysical experiments, this work modulates skin movements by varying stimulus stiffness and employing various treatments. The stimuli include brushes of three levels of stiffness and an ungloved human finger. The skin’s friction is modulated via non-hazardous chemicals and washing protocols, and the skin’s thickness and lateral movement are modulated by thin sheets of adhesive film. The stimuli are hand-brushed at controlled forces and velocities. Human participants report perceived pleasantness per trial using ratio scaling. The results indicate that a brush’s stiffness influenced pleasantness more than any skin treatment. Surprisingly, varying the skin’s friction did not affect pleasantness. However, the application of a thin elastic film modulated pleasantness. Such barriers, though elastic and only 40 microns thick, inhibit the skin’s tangential movement and disperse normal force. The finding that thin films modulate affective interactions has implications for wearable sensors and actuation devices.
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