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Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
Published on: April 21, 2023
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Force Control Strategy of Five-Digit Precision Grasping With Aligned and Unaligned Configurations
Po-Tsun Chen1,2, Hsiu-Yun Hsu3, You-Hua Su4
1Chang Gung University, Taoyuan.
Human Factors
|January 3, 2022
Summary
Precision grasp force control is similar in aligned (AG) and unaligned grasping (UG) configurations. However, unaligned grasping requires larger digit moments, making it optimal for cylindrical handles.
Area of Science:
- Biomechanics of human grasping
- Motor control and human factors engineering
Background:
- Previous research focused on power grasps, with limited data on precision grasp force control across different configurations.
- Understanding precision grasp strategies is crucial for designing effective tools and assistive devices.
Purpose of the Study:
- To investigate digit force control during precision grasping in aligned (AG) and unaligned grasping (UG) configurations.
- To compare force application, variability, and inter-digit coordination between AG and UG.
Main Methods:
- Twenty healthy adults performed a lift-hold-lower task using a cylindrical simulator with force transducers.
- Applied force, moment, force variability, and inter-digit force correlations were measured in both AG and UG configurations.
Main Results:
- No significant differences were observed in applied force, force correlation, repeatability, or variability between AG and UG.
- Significantly larger moments were applied by digits during UG compared to AG.
Conclusions:
- Digit force control strategies during precision grasp are largely consistent across AG and UG, with the exception of digit moment.
- Unaligned grasping (UG) is an efficient configuration for precision grasping with cylindrical handles due to larger applied moments.
- Future research should explore task type and handle design impacts on force control, particularly for individuals with hand impairments.
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