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FILTER CHARACTERISTICS OF FINE-SURFACE-TEXTURE DISCRIMINATION IN HUMAN TACTILE PERCEPTION

人类触觉感知中细表面纹理辨别的滤波器特性

基本信息

批准号：
14510109
负责人：
MIYAOKA Tetsu
金额：
$ 1.98万
依托单位：
SHIZUOKA INSTITUTE OF SCIENCE AND TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

Miyaoka et al. proposed "amplitude-information hypothesis" for the mechanisms of fine-surface-texture discrimination in human tactile perception. The tactile information-processing system has low-pass-filter characteristics and the amplitude information only passed through the filter was used for the discrimination tasks. The Purpose of this study was to investigate the low-pass filter characteristics.1.A mathematical model was produced to show what was observed if the tactile system had the low-pass filter. In roughness discrimination tasks of diffraction gratings, the mathematical model predicted that the psychometric functions of discrimination tasks showed specific patterns.2.In an active-touch experiment, diffraction gratings were used as stimuli. Their wavelengths were from 6.7 to 75.2 μm. Subjects moved their index fingers with velocity of 20 mm/s on the stimuli. They judged roughness of the stimuli with two-alternative, forced-choice technique. Psychometric functions were calculated from the data of the experiment. Shapes of the psychometric functions were similar to the results predicted by the model. The upper-limit frequency of the low-pass filter was between 400 and 600 Hz.3.In a passive-touch experiment, diffraction gratings, from 33.3 to 150.4 μm in wavelength, were used as stimuli. The stimuli were moved using an experimental instrument with a velocity of 60 mm/s. Subjects touched the moving stimuli and judged the roughness of stimuli. The experimental results coincided with the predictions of the model.The model and the results of the experiments supported the amplitude-information hypothesis.

Miyaoka等人提出了人类触觉感知精细表面纹理辨别机制的“振幅信息假说”。触觉信息处理系统具有低通滤波特性，仅将经过滤波的幅度信息用于识别任务。本研究的目的是研究低通滤波器的特性。建立了一个数学模型来显示如果触觉系统具有低通滤波器所观察到的结果。在衍射光栅的粗糙度判别任务中，数学模型预测了判别任务的心理测量函数具有特定的模式。在主动触摸实验中，衍射光栅被用作刺激。波长范围为6.7 ~ 75.2 μm。受试者在刺激下以20 mm/s的速度移动食指。他们用两种选择的强迫选择技术来判断刺激的粗糙程度。根据实验数据计算心理测量函数。心理测量函数的形状与模型预测的结果相似。低通滤波器的上限频率在400 ~ 600hz之间。采用33.3 ~ 150.4 μm波长的衍射光栅作为无源触摸刺激。使用实验仪器以60 mm/s的速度移动刺激。受试者触摸移动的刺激物并判断刺激物的粗糙度。实验结果与模型的预测相吻合。该模型和实验结果支持幅度信息假设。