Movement-related cortical potentials before jaw excursions in XXXX .

@entity1 @entity1538 @entity16 @entity3519 @entity717 @entity18711
@entity18711 is a @entity16 characterized by involuntary contraction of masticatory and/or tongue muscles. Cortical negative shifts preceding @entity717 called "movement-related cortical potentials" (MRCPs) reflect a central motor control process. Reduced amplitude of MRCPs has been reported in other types of @entity3519 . To elucidate whether the abnormality is observed also in @entity18711 , we compared MRCPs associated with mandibular movements in 6 @entity1 with this condition and in 8 normal subjects. Electroencephalograms (EEGs) were recorded from 11 electrodes, and electromyograms (EMGs) were recorded from the masseter muscle and the suprahyoid muscles. The subjects were asked to repeat mouth @entity1538 , closing, and left and right lateral mandibular excursions. MRCPs were obtained by averaging the EEG using the EMG onset as the trigger signal. In the @entity1 group, MRCP amplitudes over central and parietal areas for mouth @entity1538 and lateral movements were significantly reduced compared to normal subjects. In normal controls, the MRCPs at mouth @entity1538 and closing were symmetrically distributed, whereas those at lateral movements showed predominance over the hemisphere ipsilateral to the direction of the movement. This laterality was lost in the @entity1 group. These results suggest impaired cortical preparatory process for jaw movements in @entity18711 .
