Perception of partial slips under tangential loading of the fingertip.

Perception of partial slips under tangential loading of the fingertip.
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DOI:
10.1038/s41598-018-25226-w
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发表时间:
2018-05-04
期刊:
影响因子:
4.6
通讯作者:
Thonnard JL
Thonnard JL
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Barrea A;Delhaye BP;Lefèvre P;Thonnard JL

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在触觉探索过程中,在完全滑动之前,部分滑动会系统地发生在指尖与物体接触的外围。尽管部分滑移的机制已得到很好的表征,但对此类事件的感知尚不清楚。在这里,我们进行了心理物理学实验,以评估光滑透明表面上的部分滑动检测能力。在这些实验中,人类受试者的食指尖被光滑、透明的玻璃板被动地抚摸,同时我们对接触在玻璃上滑动的情况进行了成像。我们发现,当平均只有 48% 的接触面积发生滑动时,受试者能够在完全滑动发生之前检测到指尖滑动。此外,我们还表明,部分滑动和板位移允许滑动检测,但受试者不能依靠切向力来检测板的滑动。最后,我们观察到,在保持法向接触力恒定的情况下,当板被疏水涂层覆盖时,滑动检测会受到阻碍,从而显着降低接触摩擦力,从而降低指尖变形量。总之,这些结果表明,部分滑动在指尖滑动检测中发挥着重要作用,并支持中枢神经系统在物体操作过程中依赖它们来调整握力的假设。
During tactile exploration, partial slips occur systematically at the periphery of fingertip-object contact prior to full slip. Although the mechanics of partial slips are well characterized, the perception of such events is unclear. Here, we performed psychophysical experiments to assess partial slip detection ability on smooth transparent surfaces. In these experiments, the index fingertip of human subjects was stroked passively by a smooth, transparent glass plate while we imaged the contact slipping against the glass. We found that subjects were able to detect fingertip slip before full slip occurred when, on average, only 48% of the contact area was slipping. Additionally, we showed that partial slips and plate displacement permitted slip detection, but that the subjects could not rely on tangential force to detect slipping of the plate. Finally, we observed that, keeping the normal contact force constant, slip detection was impeded when the plate was covered with a hydrophobic coating dramatically lowering the contact friction and therefore the amount of fingertip deformation. Together, these results demonstrate that partial slips play an important role in fingertip slip detection and support the hypothesis that the central nervous system relies on them to adjust grip force during object manipulation.
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