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Response timing variability: coherence of kinematic and EMG parameters
M J Carlton1, R N Robertson, L G Carlton
1Motor Behavior Laboratory, Institute for Child Behavior and Development, University of Illinois, Champaign, Illinois 61820, USA.
Journal of Motor Behavior
|September 1, 1985
Summary
Movement timing precision improves with increased speed, showing strong links between movement outcome variability and muscle activity (electromyography) or motion (kinematics). This study analyzed timing responses to understand movement control.
Area of Science:
- Motor control
- Biomechanics
- Human movement science
Background:
- Understanding the relationship between movement variability and control is crucial for fields like robotics and rehabilitation.
- Previous research has explored factors influencing movement timing, but the coherence between kinematic and electromyographic (EMG) variability remains an area for deeper investigation.
Purpose of the Study:
- To investigate the coherence between kinematic and EMG variability in relation to timing error reduction as movement amplitude increases.
- To elucidate the temporal organization of movement parameters during simple, single degree of freedom responses.
Main Methods:
- Detailed kinematic and electromyographic (EMG) analysis of single degree of freedom timing responses.
- Examination of timing parameters such as time to peak acceleration, acceleration duration, and deceleration duration.
- Analysis of EMG parameters including agonist and antagonist burst durations and timing.
Main Results:
- Variability in kinematic and EMG timing parameters decreased with increasing average velocity, aligning with reduced timing error.
- The coefficient of variation for peak acceleration, peak deceleration, and integrated EMG also showed a similar decreasing trend with increased velocity.
- Premotor and motor reaction times decreased as average movement velocity increased.
Conclusions:
- A strong coherence exists between the variability of movement outcomes, kinematic parameters, and EMG parameters.
- Increased movement velocity leads to more precise timing and reduced variability in both movement execution and neural control.
- Findings suggest integrated control mechanisms that link response outcome variability to the underlying neural and biomechanical processes.