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The influence of obstacles on grasp planning
Isabelle T Garzorz1,2, Alexander G Knorr3,4, Rene Gilster5
1German Center for Vertigo and Balance Disorders (DSGZ), University Hospital of Munich, Ludwig-Maximilians-Universität, 81377, Munich, Germany. isabelle.garzorz@lrz.uni-muenchen.de.
Experimental Brain Research
|July 6, 2018
Summary
Obstacles significantly alter reach-to-grasp movements, influencing contact point selection and finger trajectory direction. This early impact confirms that grasping actions are preplanned, even when avoiding collisions.
Area of Science:
- Neuroscience
- Biomechanics
- Human motor control
Background:
- Grasping movements in humans are typically preplanned with consistent contact point selection.
- Real-world scenarios often involve obstacles that necessitate adjustments to planned grasping actions.
Purpose of the Study:
- To investigate how obstacles obstructing favored contact points affect reach-to-grasp movement planning and execution.
- To determine the influence of non-obstructing obstacles at various positions on grasping parameters.
Main Methods:
- Participants performed reach-to-grasp movements towards a target object.
- Obstacles were strategically placed to either directly block favored contact points or be in proximity.
Main Results:
- Directly obstructed contact points led to selection of new points or minor shifts.
- Non-obstructing obstacles induced a repulsive effect, shifting contact points away.
- Obstacle presence influenced initial finger direction, altering trajectories and increasing movement time.
Conclusions:
- The early and significant influence of obstacles supports the hypothesis that grasping movements are preplanned.
- Motor planning incorporates potential collisions, adjusting reach-to-grasp strategies dynamically.
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