Subjective scaling of smooth surface friction
Subjective scaling of smooth surface friction
复制标题
DOI：
10.1152/jn.1996.75.5.1957
复制
发表时间：
1996-05-01
影响因子：
2.5
通讯作者：
Scott, SH
中科院分区：
文献类型：
--
作者：
Smith, AM;Scott, SH
1.要求6名男性和4名女性，年龄30-51岁，用洗涤和干燥的食指尖端触摸安装在三维作用力平台上的六个不同特征的平坦表面。这六个表面是涂有松香的玻璃、玻璃、缎面铝、聚氯乙烯(PVC)塑料、特氟龙和尼龙(聚酰胺塑料)。受试者被要求指出每个表面产生的感觉应该放在一维标尺上的什么位置，一条18厘米长的线一端标有“最滑”的字样，另一端标有“最粘”的字样。随后通过让每个受试者抚摸表面来评估每个表面和每个受试者的摩擦系数，就好像他们正在评估表面的滑度。手指的法向和切向力以250赫兹的频率数字化，并存储在实验室的计算机上。利用划水过程中平均切向力与平均垂直力的比值来计算平均动摩擦系数。所有受试者的平均摩擦力范围从尼龙印花表面的0.43到涂有松香的玻璃的2.79。每个受试者主观估计的摩擦力与测量的摩擦力系数之间的相关系数计算得出的平均相关系数为0.85(n=10，P<；0.001)。这些数据表明，受试者可以通过调节施加在手指上的切向力，同时保持法向力的相对恒定，准确地衡量宏观上光滑、平坦的表面的摩擦力的相对差异。受试者保持相对恒定的法向力，而不是改变不同表面的切向力，这一事实表明，对这些切向力敏感的感受器在感知光滑的表面摩擦方面很重要。
1. Six men and four women, 30-51 yr of age, were asked to use the tip of the washed and dried index finger to stroke six different featureless, flat surfaces mounted on a three-dimensional force platform. The six surfaces were rosin-coated glass, glass, satin-finished aluminum, poly-vinyl chloride (PVC) plastic, Teflon, and nyloprint (polyamide plastic). The subjects were requested to indicate where the sensation produced by each surface should be placed on an unidimensional scale represented by an 18-cm line labeled at one end by the words ''most slippery'' and at the other end by the words ''most sticky.'' The coefficients of friction for each surface and for each subject were subsequently assessed by asking each subject to stroke the surfaces as if they were assessing its slipperiness for 5 s.2. The finger forces normal and tangential to the stroked surfaces were digitized at 250 Hz and stored on a laboratory computer. The ratio of the mean tangential force to the mean perpendicular force during stroking was used to calculate the mean coefficient of kinetic friction. The mean friction for all subjects ranged from 0.43 for the nyloprint surface to 2.79 for the rosin-coated glass. Correlation coefficients calculated between the subjective estimates of friction aad the measured coefficients of friction for each subject individually resulted in a mean correlation of 0.85 (n = 10, P < 0.001).3. These data indicate that subjects can accurately scale relative differences in the friction of macroscopically smooth, flat surfaces, by modulating the tangential force applied to the finger while keeping the normal force relatively constant. The fact that subjects maintained a relatively constant normal force and instead varied the tangential force across different surfaces suggests that receptors sensitive to these tangential forces are important in the perception of smooth surface friction.