Cortical Neuromagnetic Fields Preceding Voluntary Jaw Movements

Slow cortical potentials (readiness potentials, RPs) reflecting the central programming of voluntary jaw movements were reported to appear preceding the movements. However, the current source producing the RP has not yet been localized. This study aimed to determine the cortical regions involved in...

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Bibliographic Details
Published in:Journal of dental research 2004-07, Vol.83 (7), p.572-577
Main Authors: Shibukawa, Y., Shintani, M., Kumai, T., Suzuki, T., Nakamura, Y.
Format: Article
Language:English
Subjects:
Adult
Brain Mapping
Contingent Negative Variation - physiology
Dentistry
Electromagnetic Fields
Electromyography
Frontal Lobe - physiology
Humans
Jaw - physiology
Magnetic Resonance Imaging
Magnetoencephalography
Male
Masticatory Muscles - physiology
Motor Cortex - physiology
Movement - physiology
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Summary:Slow cortical potentials (readiness potentials, RPs) reflecting the central programming of voluntary jaw movements were reported to appear preceding the movements. However, the current source producing the RP has not yet been localized. This study aimed to determine the cortical regions involved in the central programming of bilaterally symmetrical voluntary jaw movements, by locating the current source of the neuromagnetic counterpart of the RP (readiness field, RF). The RFs were found in the fronto-lateral region bilaterally, starting around 860 and 600 ms prior to the onset of masseter and digastric electromyograms (EMGs), respectively, and gradually increasing in magnitude to the peak within 100 ms before the EMG onset. Thus, the RFs appeared long before the reported onset of the excitability increase of pyramidal tract neurons. The current sources producing the RFs were located in the precentral gyrus bilaterally, with no bilateral differences in strength. We conclude that the primary motor cortex is involved bilaterally in central programming as well as in execution of bilaterally symmetrical voluntary jaw movements.
ISSN:0022-0345
1544-0591
DOI:10.1177/154405910408300712