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Corticomuscular Coherence Dependence on Body Side and Visual Feedback
Teresa L'Abbate1, Karolina Armonaite2, Eugenia Gianni3
1Laboratory of Electrophysiology for Translational NeuroScience, Institute of Cognitive Sciences and Technologies - Consiglio Nazionale delle Ricerche, Rome, Italy; Uninettuno University, Rome, Italy; Department of Neuroscience, Imaging and Clinical Sciences, University 'Gabriele D'Annunzio' of Chieti-Pescara, Chieti, Italy.
Neuroscience
|March 15, 2022
Summary
Removing visual feedback during handgrip tasks alters brain-muscle synchronization (corticomuscular coherence). This finding highlights the brain
Area of Science:
- Neuroscience
- Motor Control
- Human Physiology
Background:
- Physiological movement relies on sensorimotor integration, synchronizing motor commands with sensory feedback.
- Corticomuscular coherence (CMC) quantifies brain-muscle electrical activity synchronization, a key measure of this integration.
- Understanding how external factors like visual feedback influence CMC is crucial for motor control research.
Purpose of the Study:
- To investigate the impact of visual feedback availability on corticomuscular coherence (CMC).
- To examine whether the executing body side (right vs. left hand) affects CMC during isometric handgrip.
- To analyze changes in CMC parameters and electroencephalographic beta band power under varying visual conditions.
Main Methods:
- CMC was analyzed in 18 healthy volunteers performing a weak isometric handgrip.
- Participants completed the task with either their right or left hand, with and without visual feedback of exerted pressure.
- Electroencephalography (EEG) and electromyography (EMG) data were recorded to calculate CMC and beta band power.
Main Results:
- Absence of visual feedback significantly decreased CMC peak frequency (27 Hz to 23 Hz) and increased peak amplitude (0.05 to 0.07).
- Visual feedback deprivation also led to a decrease in electroencephalographic beta band power.
- No significant changes in CMC measures were observed based on the performing hand (right vs. left).
Conclusions:
- Visual feedback significantly modulates corticomuscular synchronization and cortical activity during motor tasks.
- The lack of hand-specific differences in CMC suggests minimal hemispheric asymmetry in hand representation.
- CMC is a sensitive index for monitoring sensory integration and may be valuable in personalized rehabilitation strategies.
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