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Dynamics of multifrequency coordination using parametric driving: theory and experiment.
Collins G Assisi1, Viktor K Jirsa, J A Scott Kelso
1Center for Complex Systems and Brain Sciences, Florida Atlantic University, Boca Raton, FL 33431, USA.
Biological Cybernetics
|June 1, 2005
Summary
Human sensorimotor systems can synchronize with environmental rhythms. This study explores coordination beyond synchronization limits, revealing distinct phase and amplitude transitions in human movement behavior.
Area of Science:
- Human sensorimotor control
- Dynamical systems theory
- Coordination dynamics
Background:
- Rhythmic coordination tasks link movement behavior and environmental signals.
- Previous studies focused on synchronized frequency regimes.
- Parametric coupling of environmental signals to effectors is known.
Purpose of the Study:
- Investigate human-environment coupling beyond synchronization limits.
- Identify properties of sensorimotor system coupling.
- Test predictions of stable 1:1 and 1:2 coordination modes in parametrically driven oscillators.
Main Methods:
- Experimental coordination paradigm with auditory metronome driving.
- Participants synchronized finger flexion with metronome beats.
- Metronome frequency increased incrementally from 2.5 Hz to 12 Hz.
Main Results:
- Subjects involuntarily shifted from 1:1 to 1:2 coordination at high frequencies.
- Observed transition aligns with predictions for parametrically driven oscillators.
- Extended Haken-Kelso-Bunz (HKB) model accurately describes unimanual coordination.
Conclusions:
- Unimanual coordination exhibits distinct phase and amplitude-mediated transitions.
- Transitions are mediated by oscillator amplitude and phase dynamics.
- Theoretical model and experimental results show favorable comparison.