Touch uses frictional cues to discriminate flat materials.
Touch uses frictional cues to discriminate flat materials.
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DOI：
10.1038/srep25553
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发表时间：
2016-05-06
影响因子：
4.6
通讯作者：
Thonnard JL
中科院分区：
文献类型：
--
作者：
Gueorguiev D;Bochereau S;Mouraux A;Hayward V;Thonnard JL
在一项强迫选择任务中，我们要求人类参与者通过触摸来区分玻璃板和透明的聚甲基丙烯酸甲酯（PMMA）塑料板。虽然表面是平坦的，并且没有表现出超过几十纳米的几何特征，但材料的分子结构不同。它们产生相似的摩擦系数，并且热效应受到控制。大多数参与者表现得很好，超过了机会，手指干燥的参与者对材料的辨别能力特别好。目前的触觉表面感知模型呼吁表面形貌，不能解释我们的结果。详细测量的界面力和歧视的性能之间的相关性分析表明，知觉任务依赖于短暂的接触阶段，导致充分的滑动。这一结果表明，手指和材料之间的界面力学差异可以通过触摸来感知，并且在稳定滑动开始之前发生的消逝力学具有感知价值。
In a forced-choice task, we asked human participants to discriminate by touch alone glass plates from transparent polymethyl methacrylate (PMMA) plastic plates. While the surfaces were flat and did not exhibit geometric features beyond a few tens of nanometres, the materials differed by their molecular structures. They produced similar coefficients of friction and thermal effects were controlled. Most participants performed well above chance and participants with dry fingers discriminated the materials especially well. Current models of tactile surface perception appeal to surface topography and cannot explain our results. A correlation analysis between detailed measurements of the interfacial forces and discrimination performance suggested that the perceptual task depended on the transitory contact phase leading to full slip. This result demonstrates that differences in interfacial mechanics between the finger and a material can be sensed by touch and that the evanescent mechanics that take place before the onset of steady slip have perceptual value.