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Updated: Aug 6, 2026
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The "Motor" in Implicit Motor Sequence Learning: A Foot-stepping Serial Reaction Time Task
Published on: May 3, 2018
Competitive pre-ordering during planning persists in kinematically fused sequential movements
Helena Wright-Wieckowski1,2, Jason Friedman3, Joseph M Galea1,2
1Centre for Human Brain Health, University of Birmingham, Birmingham, B15 2TT, UK.
Journal of Neurophysiology
|July 23, 2026
Summary
Movement sequences are planned competitively, even in continuous actions like handwriting. Greater kinematic fusion enhances this planning process, leading to faster, more accurate skilled movements without forming new motor primitives.
Area of Science:
- Motor control and learning
- Human-computer interaction
- Neuroscience
Background:
- Movement sequences are pre-ordered via competitive queueing (CQ) before execution.
- It remains unclear if this planning persists in continuous, biomechanically integrated actions.
- The potential for neural fusion into new motor primitives in such actions is unknown.
Purpose of the Study:
- To investigate the impact of kinematic fusion on movement sequence planning.
- To determine if continuous skilled actions form new motor primitives.
- To examine the relationship between kinematic fusion, competitive queueing, and performance.
Main Methods:
- Participants performed memory-based sequential center-out-and-back movements using a stylus.
- Kinematic fusion was manipulated by varying angles between sequential targets (acute, right, obtuse).
- Probe trials assessed movement element availability during planning.
Main Results:
- Movement elements for later sequence positions were less available, consistent with CQ.
- A stronger CQ gradient correlated with increased kinematic fusion, faster initiation, and improved accuracy.
- Kinematically fused sequential actions did not lead to the formation of new movement primitives.
Conclusions:
- Continuous skilled actions are planned separately, not as a single fused motor plan.
- Competitive queueing of movement elements persists in handwriting-like tasks.
- Kinematic fusion enhances sequence planning and skilled performance without neural fusion.
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