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Updated: Jun 10, 2026
10:51
Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
Published on: January 15, 2018
Bimanual grasp planning reflects changing rather than fixed constraint dominance.
Robrecht P R D van der Wel1, David A Rosenbaum
1Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen, Nijmegen, The Netherlands. r.vanderwel@donders.ru.nl
Experimental Brain Research
|July 27, 2010
Summary
Grasping objects involves flexible motor-control constraints, not rigid ones. Priorities of constraints change based on task demands and experience, impacting skill learning.
Area of Science:
- Motor control
- Human movement science
- Cognitive neuroscience
Background:
- Motor control research often assumes rigid hierarchies of constraints for actions.
- Understanding how humans adapt grasping to changing task demands is crucial for skill acquisition.
Purpose of the Study:
- To investigate whether motor-control constraints for grasping are rigid or flexible.
- To determine how task variations influence the prioritization of grasping constraints.
Main Methods:
- Two experiments involving participants grasping and moving two plungers to various target locations.
- Manipulation of target heights and mass distributions of the plungers.
Main Results:
- Grasping symmetry and end-posture comfort were prioritized when target heights were identical.
- These tendencies decreased when target heights differed, indicating flexible constraint application.
- Participants prioritized end-state comfort over bimanual symmetry when plunger mass distributions varied.
Conclusions:
- Bimanual grasp planning utilizes a flexible, dynamic hierarchy of constraints.
- Constraint importance shifts based on task specifics and experience level.
- Flexible constraint prioritization may be a key mechanism in perceptual-motor skill learning.
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