Corticomuscular and bilateral EMG coherence reflect distinct aspects of neural synchronization

Using electroencephalography (EEG) and electromyography (EMG), corticomuscular and bilateral motor unit synchronization have been found in different frequency bands and under different task conditions. These different types of long-range synchrony are hypothesized to originate from distinct mechanis...

Full description

Saved in:
Bibliographic Details
Published in:Neuroscience letters 2009-09, Vol.463 (1), p.17-21
Main Authors: Boonstra, Tjeerd W., van Wijk, Bernadette C.M., Praamstra, Peter, Daffertshofer, Andreas
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Choice Behavior
Common drive
Cortical Synchronization
Cues
EEG
Electromyography
Female
Functional connectivity
Fundamental and applied biological sciences. Psychology
Hand - innervation
Hand - physiology
Hand Strength
Humans
Male
Motor control
Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration
Motor Cortex - physiology
Motor Neurons - physiology
Muscle, Skeletal - innervation
Muscle, Skeletal - physiology
Time–frequency analysis
Vertebrates: nervous system and sense organs
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Using electroencephalography (EEG) and electromyography (EMG), corticomuscular and bilateral motor unit synchronization have been found in different frequency bands and under different task conditions. These different types of long-range synchrony are hypothesized to originate from distinct mechanisms. We tested this by comparing time-resolved EEG–EMG and EMG–EMG coherence in a bilateral precision-grip task. Bilateral EMG activity was synchronized between 7 and 13Hz for about 1s when force output from both hands changed from an increasing to a stable force production. In contrast, EEG–EMG coherence was statistically significant between 15 and 30Hz during stable force production. The disparities in their time–frequency profiles accord with the existence of distinct underlying processes for corticomuscular and bilateral motor unit synchronization. In addition, the absence of synchronization between cortical activity and common spinal input at 10Hz renders a cortical source unlikely.
ISSN:0304-3940
1872-7972
DOI:10.1016/j.neulet.2009.07.043