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The effect of elastic and viscous force fields on bimanual coordination
Jaskanwaljeet Kaur1, Shannon Proksch2,3, Ramesh Balasubramaniam2
1Sensorimotor Neuroscience Laboratory, Cognitive and Information Sciences, University of California, 5200 N Lake Road Merced, Merced, CA, 95343, USA. jkaur28@ucmerced.edu.
Experimental Brain Research
|March 14, 2023
Summary
Altering limb forces disrupts bimanual coordination. Symmetry breaking in upper limbs, through force fields, reduced movement stability in both in-phase and anti-phase tasks, especially anti-phase coordination.
Area of Science:
- Neuroscience
- Biomechanics
- Human motor control
Background:
- Bimanual coordination involves distinct in-phase and anti-phase movement patterns.
- Understanding limb contributions to coordination requires perturbing limb dynamics.
Purpose of the Study:
- To investigate how symmetry breaking between upper limbs affects bimanual coordination stability.
- To examine the impact of elastic and viscous force fields on in-phase and anti-phase movements.
Main Methods:
- Participants performed bimanual in-phase and anti-phase movements using a Kinarm robot exoskeleton.
- Limb symmetry was manipulated by applying matched or mismatched elastic and viscous force fields.
- Relative phase (ϕ) mean and variability were measured to assess coordination stability.
Main Results:
- Deviations from intended phase were minimal in matched force conditions, except for anti-phase movements with elastic loads.
- Mismatched force fields led to greater phase deviations, particularly in anti-phase coordination.
- Relative phase variability increased under mismatched force conditions and during anti-phase movements.
Conclusions:
- Symmetry breaking between limbs, induced by force differences, destabilizes bimanual coordination.
- Anti-phase coordination is more susceptible to disruptions in interlimb symmetry.
- These findings highlight the sensitivity of motor control to interlimb dynamic coupling.
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