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Coordination of bilateral synchronous and asynchronous hand movements
S Köchli1, T Scharfenberger1, V Dietz1
1Spinal Cord Injury Center, University Hospital Balgrist, Zürich, Switzerland.
Neuroscience Letters
|January 22, 2020
Summary
Bilateral hand movements are automatically coordinated by neural coupling during synchronous tasks. Asynchronous tasks require independent, visually guided movements, resulting in more errors.
Area of Science:
- Neuroscience
- Motor Control
- Human Movement Science
Background:
- Bilateral movements, essential for daily activities, can be either synchronous or asynchronous.
- Neural coupling is hypothesized to underlie coordinated bilateral movements, evidenced by cross-limb reflex responses.
- Understanding the control mechanisms for synchronous versus asynchronous movements is crucial for motor neuroscience.
Purpose of the Study:
- To investigate the mechanical effects of neural coupling during bilateral synchronous and asynchronous hand movements.
- To differentiate the neural control strategies employed during coordinated versus independent hand actions.
- To analyze movement errors and corrective responses in relation to task synchrony.
Main Methods:
- Participants performed bilateral synchronous and asynchronous sinusoidal tracking tasks.
- Unilateral arm nerve stimulation was used to elicit reflex responses in forearm muscles.
- Kinematic data, including corrective movements and errors, were analyzed for both hands.
Main Results:
- Synchronous tracking revealed mirrored corrective movements, indicating neural coupling between the hands.
- Asynchronous tracking resulted in large, non-coupled corrective movements, suggesting independent limb control.
- Asynchronous movements exhibited greater errors and corrections compared to synchronous movements.
Conclusions:
- Synchronous bilateral hand movements are automatically coordinated via neural coupling.
- Asynchronous hand movements are primarily visually guided and voluntarily controlled, necessitating independent limb control.
- The findings highlight distinct neural mechanisms governing coordinated and independent bilateral actions.
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