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施加于指腹的切向力的大小估计。

Magnitude estimation of tangential force applied to the fingerpad.

作者信息

Paré Michel, Carnahan Heather, Smith Allan M

机构信息

Centre de Recherche en Sciences Neurologiques, Département de Physiologie, Université de Montréal, C.P. 6128, Succ. Centre-ville, Montreal, QC, Canada H3C 3J7.

出版信息

Exp Brain Res. 2002 Feb;142(3):342-8. doi: 10.1007/s00221-001-0939-y. Epub 2001 Dec 4.

Abstract

Prior research on large-fibre skin mechanoreceptors in humans and monkeys has demonstrated their sensitivity to perpendicular skin indentation and to the rate of force application. Although some studies have examined skin afferent responses to stretch, relatively few investigations have examined the neural and perceptual correlates of shear forces applied tangentially to the skin. The present study assessed the ability of human subjects to scale different levels of tangential force applied to the distal pad of the index finger. Subjects were instructed to choose their own magnitude estimation scale. Seven force levels ranging from 0.15 to 0.70 N were delivered randomly at rates of 0.10 N/s, 0.15 N/s or 0.30 N/s. Tangential forces were produced with a smooth metal spatula coated with an adhesive to insure a shear force on the underlying skin without slip. The same procedures were also used to generate skin indentation with normal forces. The results showed that most human subjects were able to scale different magnitudes of both tangential and normal forces applied to the tip of the index finger. The rate of force change did not influence the perception of the applied forces. These results highlight the potentially important role of tangential forces in haptic perception.

摘要

先前针对人类和猴子的大纤维皮肤机械感受器的研究表明,它们对垂直于皮肤的压痕以及力的施加速率敏感。尽管一些研究已经考察了皮肤传入神经对拉伸的反应,但相对较少的研究考察了切向施加于皮肤的剪切力的神经和感知相关性。本研究评估了人类受试者对施加于食指远端指腹的不同水平切向力进行量化的能力。受试者被要求自行选择量级估计量表。七个力水平范围从0.15到0.70牛,以0.10牛/秒、0.15牛/秒或0.30牛/秒的速率随机施加。使用涂有粘合剂的光滑金属刮刀产生切向力,以确保对下面的皮肤产生剪切力且无滑动。同样的程序也用于用法向力产生皮肤压痕。结果表明,大多数人类受试者能够对施加于食指指尖的不同量级的切向力和法向力进行量化。力的变化速率并未影响对所施加力的感知。这些结果突出了切向力在触觉感知中潜在的重要作用。

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