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Existential reason of human handeness examined from tool-use during grasping tasks and task difficulty

Research Project

Project/Area Number 19K06874
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 45060:Applied anthropology-related
Research InstitutionPrefectural University of Kumamoto

Principal Investigator

Aoki Tomoko  熊本県立大学, 共通教育センター, 教授 (50433412)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords利き手 / 道具 / 把握運動 / 指 / 難易度 / 手 / 把握 / 動作分析 / 道具使用 / 運動機能 / 手指
Outline of Research at the Start

本研究では、なぜ、利き手が存在するのか?なぜ、ヒトには右利きが多いのか?といった疑問の解明を目指しています。①道具使用の有無(箸 vs 指)、②使い慣れた道具とそうでない道具(箸 vs 医療用止血鉗子)、③正確性を要する課題とそうでない課題(ターゲット小 vs ターゲット大)の異なる条件で、④右利き者と左利き者を対象に把握運動課題を実施します。そして、手指の3次元動作解析と把握物体に対して発揮される3軸方向の作用力の分析、さらには筋電図解析を行い、異なる条件下で手の左右差がどのように変化するのかを調べます。

Outline of Final Research Achievements

The motor characteristics of dominant and non-dominant hands were investigated from the three perspectives of (1) tool-use, (2) familiarity to the use of tools and (3) task difficulty. We measured the forces acting on an object using 3 axes force sensor. The positions of the object and hand were examined using 3D motion capture system. Muscle activities in the arms were also measured. Interestingly, in both right- and left-handed subjects, for the dominant hand the unfamiliar tool condition took longer than the other conditions to perform the task, while for the non-dominant hand the familiar tool condition took longer than the other conditions to perform the task. These results suggest that tool use and familiarity with tool use have a strong influence on differences in motor skills between dominant and non-dominant hands.

Academic Significance and Societal Importance of the Research Achievements

「利き手」は人間の96%に見られる現象である。利き手は非常に身近な現象にもかかわらず、そのメカニズムはほとんど解明されていない。多くの先行研究において、利き手は非利き手よりも優れた運動能力を持つことが報告されているが、どのような運動課題において利き手と非利き手の違いが最も明確になるのかは、依然として不明である。そこで、本研究では、利き手あるいは非利き手によって、物体を把握し、移動させる課題を「道具の有無」、「使い慣れた道具とそうでない道具」、「課題の難易度」の異なる条件で行い、物体の移動に要する時間、物体や手指の位置、筋活動等を調べた。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2024 2023 Other

All Int'l Joint Research (4 results) Presentation (2 results) (of which Int'l Joint Research: 2 results)

  • [Int'l Joint Research] University of Rochester(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] ロチェスター大学(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] ロチェスター大学(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] ロチェスター大学(米国)

    • Related Report
      2020 Research-status Report
  • [Presentation] Effects of tool use on differences between dominant and non-dominant hands in right-handed and left-handed individuals2024

    • Author(s)
      Tomoko Aoki, Marc H. Schieber
    • Organizer
      The 33rd Annual Meeting of the Society for the Neural Control of Movement
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effects of Tool Use on Differences Between Dominant and Non-dominant Hands2023

    • Author(s)
      Tomoko Aoki
    • Organizer
      The 16th International Congress of Physiological Anthropology
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2025-01-30  

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