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The alpha-motoneuron pool as transmitter of rhythmicities in cortical motor drive.
- Source :
-
Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology [Clin Neurophysiol] 2010 Oct; Vol. 121 (10), pp. 1633-42. - Publication Year :
- 2010
-
Abstract
- Objective: Investigate the effectiveness and frequency dependence of central drive transmission via the alpha-motoneuron pool to the muscle.<br />Methods: We describe a model for the simulation of alpha-motoneuron firing and the EMG signal as response to central drive input. The transfer in the frequency domain is investigated. Coherence between stochastical central input and EMG is also evaluated.<br />Results: The transmission of central rhythmicities to the EMG signal relates to the spectral content of the latter. Coherence between central input to the alpha-motoneuron pool and the EMG signal is significant whereby the coupling strength hardly depends on the frequency in a range from 1 to 100 Hz. Common central input to pairs of alpha-motoneurons strongly increases the coherence levels. The often-used rectification of the EMG signal introduces a clear frequency dependence.<br />Conclusions: Oscillatory phenomena are strongly transmitted via the alpha-motoneuron pool. The motoneuron firing frequencies do play a role in the transmission gain, but do not influence the coherence levels. Rectification of the EMG signal enhances the transmission gain, but lowers coherence and introduces a strong frequency dependency. We think that it should be avoided.<br />Significance: Our findings show that rhythmicities are translated into alpha-motoneuron activity without strong non-linearities.<br /> (Copyright 2010 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.)
- Subjects :
- Animals
Computer Simulation
Electric Stimulation methods
Electromyography methods
Humans
Neural Pathways physiology
Spectrum Analysis
Statistics as Topic
Time Factors
Action Potentials physiology
Models, Neurological
Motor Cortex cytology
Motor Neurons physiology
Muscle, Skeletal physiology
Periodicity
Subjects
Details
- Language :
- English
- ISSN :
- 1872-8952
- Volume :
- 121
- Issue :
- 10
- Database :
- MEDLINE
- Journal :
- Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology
- Publication Type :
- Academic Journal
- Accession number :
- 20434397
- Full Text :
- https://doi.org/10.1016/j.clinph.2010.03.052