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Control of asymmetrical bimanual movements
S P Swinnen1, D E Young, C B Walter
1I.L.O. Group Biomedical Sciences, Katholic University of Leuven, Heverlee, Belgium.
Experimental Brain Research
|January 1, 1991
Summary
When performing different upper-limb movements simultaneously, the brain tends to synchronize them. However, individuals can partially overcome this synchronization, demonstrating parallel motor control capabilities.
Area of Science:
- Neuroscience
- Motor Control
- Biomechanics
Background:
- Upper-limb movements often exhibit synchronization tendencies.
- Performing simultaneous, distinct movements challenges motor control systems.
Purpose of the Study:
- To investigate the simultaneous organization and control of spatiotemporally different upper-limb movements.
- To explore the influence of symmetrical versus asymmetrical practice conditions on motor synchronization.
Main Methods:
- Subjects performed unidirectional and reversal elbow movements in symmetrical and asymmetrical practice conditions.
- Analysis included cross-correlations of angular acceleration and muscle activity differentiation between limbs.
Main Results:
- Asymmetrical practice led to movement assimilation, with unidirectional movements being more attracted to reversal movements.
- Subjects demonstrated partial suppression of synchronization, evidenced by moderate cross-correlations and differentiated muscle activity.
- An asymmetrical effect was observed in the degree of movement assimilation between limbs.
Conclusions:
- Evidence suggests a degree of parallel control for spatiotemporally distinct actions.
- Findings may indicate the suppression of a bilateral motor control system responsible for proximal limb activation.