A perceptual analysis of viscosity
A perceptual analysis of viscosity
复制标题
粘度的感知分析
作者：
L. Jones;I. Hunter
粘度的感知是通过对侧肢体匹配过程来研究的，在这个过程中，受试者调整连接到一只（匹配）手臂手腕的马达的粘度，直到它被感知到与连接到另一只（参考）手臂的马达的粘度相同。使用两台伺服控制的电磁直线电机，计算机控制粘度，向11名受试者显示2至1024 N·s/m的粘度幅度。实验对象匹配了10种不同的黏度，每种刺激幅度重复10次。与参考匹配粘度相关的心理物理函数是线性的（方差占99%），并且粘度匹配的准确性（斜率为0.88）与先前报道的力，肢体位置和刚度相似。粘度的韦伯分数为0.34，比刚度的韦伯分数大50%，比力的韦伯分数大两倍。对感知参考粘度所产生的运动和力的分析表明，受试者没有改变运动的幅度，并且通常会对前臂进行非常小的偏移，但是运动的速度和力作为参考粘度的函数都发生了显着变化。这些发现被解释为表明人类本体感觉系统能够整合有关力和运动速度的信息，从而感知与肢体相连的机械系统的粘度，但其对粘度变化的敏感性远低于其检测肌肉力和肢体运动变化的能力所预测的。
The perception of viscosity was studied using the contralateral limb-matching procedure in which subjects adjusted the viscosity of a motor connected to the wrist of one (matching) arm until it was perceived to be the same as that of the motor attached to the other (reference) arm. Two servo-controlled electromagnetic linear motors with computer-controlled viscosity were used to present viscosities ranging in amplitude from 2 to 1024 N · s/m to 11 subjects. Ten different viscosities were matched by subjects, and there were ten repetitions of each stimulus amplitude. The psychophysical function relating the reference to matching viscosity was linear (99% variance accounted for), and the accuracy with which the viscosities were matched (slope of 0.88) paralleled that reported previously for force, limb position and stiffness. The Weber fraction for viscosity was 0.34, which is 50% larger than that measured for stiffness and over twice that reported for force. An analysis of the movements and forces generated to perceive the reference viscosity revealed that subjects did not vary the amplitude of the movements and typically made very small excursions of the forearm, but that both the velocity of the movements and force changed significantly as a function of the reference viscosity. These findings were interpreted as indicating that the human proprioceptive system is capable of integrating information regarding force and movement velocity so as to perceive the viscosity of a mechanical system connected to the limbs, but that its sensitivity to changes in viscosity is much less than would be predicted from its capacity to detect variations in muscle force and limb movement.
影响因子：
2.5
作者：
HOUK, JC;RYMER, WZ;CRAGO, PE
通讯作者：
CRAGO, PE