The relation between different fingers pressing elastic objects and the characteristics of hardness discriminability
Identification of the hardness of an object in a human hand is different according to the hardness of the object. For example, chiropractors identify stiffness in the muscle by using their thumb, which can press more forcefully than the forefinger. However, it has not been shown experimentally if th...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2016-06-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/82/838/82_16-00001/_pdf/-char/en |
| _version_ | 1811317879822352384 |
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| author | Mizuho TANAKA Yumi UMESAWA Kouki DOI Hiroshi FUJIMOTO |
| author_facet | Mizuho TANAKA Yumi UMESAWA Kouki DOI Hiroshi FUJIMOTO |
| author_sort | Mizuho TANAKA |
| collection | DOAJ |
| description | Identification of the hardness of an object in a human hand is different according to the hardness of the object. For example, chiropractors identify stiffness in the muscle by using their thumb, which can press more forcefully than the forefinger. However, it has not been shown experimentally if the characteristics of hardness discriminability are different according to fingers. In this study, to clarify the relation between different fingers pressing elastic objects and the characteristics of hardness discriminability, we investigated the differential threshold of hardness using the forefinger and thumb. Additionally, the influence of press force and press displacement on the characteristics of hardness discriminability was clarified. We used 7 elastic test pieces with different Young’s moduli as the presented stimuli. We also used the test pieces with hardness sensation judged as ‘hard’ in our previous research. We conducted the experiment using the constant stimuli method to calculate differential threshold of hardness as one evaluation index of hardness discriminability when using the forefinger and thumb. The results of this experiment showed that the hardness discriminability of the thumb was better than that of the forefinger. In addition, these results suggested that press displacement but not press force should be used to estimate the hardness discriminability and that the thumb is better than the forefinger to discriminate the displacement. These findings clarify the mechanism underlying hardness discriminability in the human hand. |
| first_indexed | 2024-04-13T12:16:03Z |
| format | Article |
| id | doaj.art-53414d0ad3c4428bb02d26f305914348 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-13T12:16:03Z |
| publishDate | 2016-06-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-53414d0ad3c4428bb02d26f3059143482022-12-22T02:47:21ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612016-06-018283816-0000116-0000110.1299/transjsme.16-00001transjsmeThe relation between different fingers pressing elastic objects and the characteristics of hardness discriminabilityMizuho TANAKA0Yumi UMESAWA1Kouki DOI2Hiroshi FUJIMOTO3Graduate School of Human Sciences, Waseda UniversityGraduate School of Human Sciences, Waseda UniversityDepartment of Education Information, National Institute of Special Needs EducationFaculty of Human Sciences, Waseda UniversityIdentification of the hardness of an object in a human hand is different according to the hardness of the object. For example, chiropractors identify stiffness in the muscle by using their thumb, which can press more forcefully than the forefinger. However, it has not been shown experimentally if the characteristics of hardness discriminability are different according to fingers. In this study, to clarify the relation between different fingers pressing elastic objects and the characteristics of hardness discriminability, we investigated the differential threshold of hardness using the forefinger and thumb. Additionally, the influence of press force and press displacement on the characteristics of hardness discriminability was clarified. We used 7 elastic test pieces with different Young’s moduli as the presented stimuli. We also used the test pieces with hardness sensation judged as ‘hard’ in our previous research. We conducted the experiment using the constant stimuli method to calculate differential threshold of hardness as one evaluation index of hardness discriminability when using the forefinger and thumb. The results of this experiment showed that the hardness discriminability of the thumb was better than that of the forefinger. In addition, these results suggested that press displacement but not press force should be used to estimate the hardness discriminability and that the thumb is better than the forefinger to discriminate the displacement. These findings clarify the mechanism underlying hardness discriminability in the human hand.https://www.jstage.jst.go.jp/article/transjsme/82/838/82_16-00001/_pdf/-char/enhardness discriminabilitythumbforefingerconstant stimuli methoddifferential thresholdpress forcepress displacement |
| spellingShingle | Mizuho TANAKA Yumi UMESAWA Kouki DOI Hiroshi FUJIMOTO The relation between different fingers pressing elastic objects and the characteristics of hardness discriminability Nihon Kikai Gakkai ronbunshu hardness discriminability thumb forefinger constant stimuli method differential threshold press force press displacement |
| title | The relation between different fingers pressing elastic objects and the characteristics of hardness discriminability |
| title_full | The relation between different fingers pressing elastic objects and the characteristics of hardness discriminability |
| title_fullStr | The relation between different fingers pressing elastic objects and the characteristics of hardness discriminability |
| title_full_unstemmed | The relation between different fingers pressing elastic objects and the characteristics of hardness discriminability |
| title_short | The relation between different fingers pressing elastic objects and the characteristics of hardness discriminability |
| title_sort | relation between different fingers pressing elastic objects and the characteristics of hardness discriminability |
| topic | hardness discriminability thumb forefinger constant stimuli method differential threshold press force press displacement |
| url | https://www.jstage.jst.go.jp/article/transjsme/82/838/82_16-00001/_pdf/-char/en |
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