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Stopping is not an option: the evolution of unstoppable motion elements (primitives)
Ronen Sosnik1, Eliyahu Chaim2, Tamar Flash3
1Faculty of Electrical, Electronics and Communication Engineering, Holon Institute of Technology, Holon, Israel; and ronens@hit.ac.il.
Journal of Neurophysiology
|June 5, 2015
Summary
Stopping movements depends on high-level motion plans, not just speed. Once initiated, planned movements continue to completion, suggesting motion primitives are unstoppable.
Area of Science:
- Neuroscience
- Motor Control
- Human Movement Science
Background:
- Stopping performance is linked to movement velocity.
- The influence of high-level motion constraints on stopping is unclear.
Purpose of the Study:
- Investigate if high-level motion constraints affect stopping performance.
- Determine if planned movements are interrupted by stop cues.
Main Methods:
- 15 subjects connected four target points on a digitizing tablet.
- Subjects were instructed to stop rapidly upon a "stop" cue.
- Movement trajectories were analyzed for straight paths versus coarticulation.
Main Results:
- Stopping performance showed weak correlation with velocity in coarticulating subjects.
- Straight, point-to-point, or curved trajectories were not disrupted by stop cues.
- High-level motion planning influenced stopping, not just low-level features.
Conclusions:
- Stopping performance is constrained by high-level motion planning, like completing a geometrical plan.
- Globally planned movements, once started, proceed to completion.
- This supports the concept of motion primitives as unstoppable elements.
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