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Time dependence of coupling in frequency-scaled bimanual coordination
Eric G James1, Peter C M Molenaar, Karl M Newell
1Department of Health and Human Performance, University of Texas at Brownsville, 2.638 REK Building, 80 Fort Brown, Brownsville, TX 78526, USA. Eric.James@utb.edu
Neuroscience Letters
|January 4, 2011
Summary
Human bimanual coordination shows increased variability and effector dependence as movement frequency rises. Stronger coupling stabilizes movement patterns, delaying phase transitions during complex tasks.
Area of Science:
- Motor control
- Human movement science
- Dynamical systems theory
Background:
- Relative phase fluctuations in bimanual coordination deviate from random noise.
- Previous research indicates complex time-dependent properties in coordinated movements.
Purpose of the Study:
- To investigate time-dependent properties in bimanual coordination.
- To compare relative phase variability and effector independence during frequency scaling.
Main Methods:
- Reproduced Kelso's (1984) bimanual frequency-scaling protocol.
- Induced phase transitions from antiphase to in-phase by increasing movement frequency.
Main Results:
- Relative phase variability increased with higher movement frequencies.
- Effectors demonstrated greater dependence prior to phase transitions.
- Increased effector coupling correlated with reduced phase transition occurrence.
Conclusions:
- Higher movement frequencies lead to increased relative phase variability and effector dependence.
- Stronger effector coupling appears to maintain pattern stability and delay phase transitions.
- Findings align with models suggesting coupling influences stability in coordinated movements.
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