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Human capability of discriminating relief-like 2D figures in tactile displaying

Published online by Cambridge University Press:  05 August 2010

Masahiro Ohka ,
Hiroki Yoshino  and
Tetsu Miyaoka
Masahiro Ohka*
Affiliation:
Department of Complex Systems Science, Graduate School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Hiroki Yoshino
Affiliation:
Honda R&D Co., Ltd., Motorcycle R&D Center, 3-15-1, Senzui, Asaka-shi, Saitama 351-0024, Japan. E-mail: [email protected]
Tetsu Miyaoka
Affiliation:
Shizuoka Institute of Science and Technology, Faculty of Comprehensive Informatics, 2200-2, Toyosawa, Fukuroi-shi, Shizuoka 473-8555, Japan. E-mail: [email protected]
*
*Corresponding author. E-mail: [email protected]
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Summary

To enhance tactile display capability, we performed a series of experiments based on psychophysics in which we adopted a circle and eight kinds of ovals as stimuli of the convex line (hereafter tactile image). The circle's diameter is 10 mm, the minor axes of the eight ovals are decreased in 3% steps from the circles, and each major axis is adjusted so that the area of each oval equals the circle area. Human subjects judged which stimuli (presented on the left or the right tactile images) equal the circle. The experiment was conducted on both the finger pads and the thenar parts to compare their experimental sensitivity ratios with the sensitivity ratio estimated on the basis of mechanoreceptor density. The discrimination sensitivity for the thenar part is inferior to that for the finger pad in terms of the low density of the mechanoreceptor in the thenar part. The tactile image was mainly recognized by a slowly adaptive type I unit, but the first adaptive type II unit was not affected by specimen cooling due to discrimination precision. Subsequently, discrimination sensitivity was not different between the free and restricted haptic motions. Since this result implies that the tactile image is modified by a motor signal for the haptic motion to prevent blurring of the tactile image, perhaps the motion movement in the tactile display is changed based on the design convenience.

Keywords

Haptic interfaceHuman biomechanicsMan–machine systemSensor or actuator designTeleoperationPsychophysicsCutaneous sensesFinger padThenar partProprioception
Type
Articles
Information
Robotica , Volume 29 , Issue 4 , July 2011 , pp. 527 - 533
Copyright
Copyright © Cambridge University Press 2010

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