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Time-frequency analysis of the EEG mu rhythm as a measure of sensorimotor integration in the later stages of swallowing.
Clin Neurophysiol. 2016 Jul;127(7):2625-35
Authors: Cuellar M, Harkrider AW, Jenson D, Thornton D, Bowers A, Saltuklaroglu T
Abstract
OBJECTIVE: Electroencephalography (EEG) was used to map the temporal dynamics of sensorimotor integration relative to the strength and timing of muscular activity during swallowing.
METHODS: 64-channel EEG data and surface electromyographic (sEMG) data were recorded from 25 neurologically-healthy adults during swallowing and tongue-tapping. Events were demarcated so that sensorimotor activity primarily from the pharyngeal and esophageal phases of swallowing could be compared to activity resulting from tongue tapping.
RESULTS: Independent component analysis identified bilateral clusters of sensorimotor mu components localized to the premotor and primary motor cortices as well as an infrahyoid myogenic cluster. Subsequent event-related spectral perturbations (ERSP) analyses showed event-related desynchronization (ERD) in the spectral power in the alpha (8-13Hz) and beta (15-25Hz) frequency bands of the mu clusters in both tasks. Mu ERD was stronger during swallowing when compared to tongue tapping (pFDR<.05) and the differences in sensorimotor processing between conditions was greater in the right hemisphere than the left, suggesting stronger right hemisphere lateralization for swallowing than tongue-tapping.
CONCLUSION: Mu activity was interpreted as representing a normal feed forward and feedback driven sensorimotor loop during the later stages of swallowing.
SIGNIFICANCE: Results support further use of this novel neuroimaging technique to concurrently map neural and muscle activity during swallowing in clinical populations using EEG.
PMID: 27291882 [PubMed - in process]
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