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Updated: Nov 17, 2025
09:36
Measurement of Spatial Stability in Precision Grip
Published on: June 4, 2020
3.4K
Friction is preferred over grasp configuration in precision grip grasping
Lina K Klein1, Guido Maiello1, Roland W Fleming1,2
1Department of Experimental Psychology, Justus Liebig University Giessen, Giessen, Germany.
Journal of Neurophysiology
|February 18, 2021
Summary
Humans prioritize grasp stability over natural hand configurations when reaching for objects. Even with varied surface materials, stability guides endpoint selection, demonstrating a preference for secure grips.
Area of Science:
- Human motor control
- Biomechanics
- Robotics
Background:
- Grasping an object involves selecting endpoints based on factors like stability and preferred configuration.
- The interplay between grasp stability and natural grasp configuration (NGA) in endpoint selection remains unclear.
Purpose of the Study:
- To investigate whether humans prioritize grasp stability or natural grasp configuration when these factors conflict.
- To determine the influence of object surface material on grasp endpoint selection.
Main Methods:
- Participants reached to grasp cuboid objects with manipulated surface friction (all-brass, wood, sandpaper/Vaseline).
- Object orientations were varied relative to participants' natural grasp axes (NGA).
- Grasp endpoints were analyzed based on object properties and NGA alignment.
Main Results:
- Grasp endpoints were influenced by object orientation and surface material.
- Natural grasp configuration (NGA) was prioritized with uniform surfaces.
- Participants adopted less preferred configurations for more stable grasps on varied surfaces.
Conclusions:
- Grasp stability is a more critical factor than biomechanically comfortable grasp configuration.
- Humans readily adapt grasp configurations to ensure object stability, overriding personal preferences.
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