Fingertip Moisture Is Optimally Modulated During Object Manipulation
Fingertip Moisture Is Optimally Modulated During Object Manipulation
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DOI：
10.1152/jn.00901.2009
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发表时间：
2010-01-01
影响因子：
2.5
通讯作者：
Thonnard, J-L.
中科院分区：
文献类型：
--
作者：
Andre, T.;Lefevre, P.;Thonnard, J-L.
放大图片作者：Andres T，Lefevre P.指尖水分在物体操作过程中得到最佳调节。J Neurophysiol 103：402-408，2010.首次发表于2009年11月11日; doi：10.1152/jn.00901.2009。手指在物体上施加的法向力和指尖的切向约束之间的协调有助于成功地操纵物体。众所周知，防止物体滑动所需的最小夹持力强烈地取决于手指-物体界面处的摩擦特性。此外，在握力调制的个体间的变化表明，皮肤的水分水平可能会影响握力策略。在本研究中，我们要求受试者执行一个水平的点对点的任务，持有一个物体与精确的抓地力。该物体装有湿度传感器。我们发现大的内部和个体内水分水平的变化。有一个很强的相关性之间施加的握力和指尖的水分含量。事实上，当指尖湿度相对于摩擦是最佳的时，抓握力是最小的。此外，指尖水分倾向于这个最佳水平，在这个最佳水平下，握力最小。总之，我们显示了一个调制的抓地力与水分水平和假设的新机制的水分调节，往往稳定的水分水平的值，最大限度地减少抓地力。
Andre T, Lefevre P, Thonnard J-L. Fingertip moisture is optimally modulated during object manipulation. J Neurophysiol 103: 402-408, 2010. First published November 11, 2009; doi: 10.1152/jn.00901.2009. Coordination between the normal force exerted by fingers on a held object and the tangential constraints at the fingertips helps to successfully manipulate objects. It is well established that the minimal grip force required to prevent an object from slipping strongly depends on the frictional properties at the finger-object interface. Moreover, interindividual variation in the modulation of grip force suggests that the moisture level of the skin could influence grip force strategy. In the present study we asked subjects to perform a horizontal point-to-point task holding an object with a precision grip. The object was equipped with a moisture sensor. We found large inter- and intraindividual moisture level variations. There was a strong correlation between grip force exerted and moisture level at the fingertips. Indeed, the grip force was minimal when the fingertip moisture was optimal with respect to friction. Furthermore, fingertip moisture tended toward this optimal level at which grip force is minimal. In conclusion, we showed a modulation of the grip force with moisture level and hypothesized novel mechanisms of moisture regulation that tend to stabilize the moisture level toward the value that minimizes grip force.