Analysis of High-Frequency Electroencephalographic-Electromyographic Coherence Elicited by Speech and Oral Nonspeech Tasks in Parkinson’s Disease Purpose Corticomuscular electroencephalographic-electromyographic (EEG-EMG) coherence elicited by speech and nonspeech oromotor tasks in healthy participants and those with Parkinson’s disease (PD) was examined. Hypotheses were the following: (a) corticomuscular coherence is demonstrable between orbicularis oris (OO) muscles' EMG and scalp EEG recording; (b) the presence, location, and magnitude of coherence ... Research Article
Research Article  |   November 14, 2016
Analysis of High-Frequency Electroencephalographic-Electromyographic Coherence Elicited by Speech and Oral Nonspeech Tasks in Parkinson’s Disease
 
Author Affiliations & Notes
  • John N. Caviness
    Mayo Clinic, Scottsdale, AZ
  • Julie M. Liss
    Arizona State University, Tempe
  • Charles Adler
    Mayo Clinic, Scottsdale, AZ
  • Virgilio Evidente
    Mayo Clinic, Scottsdale, AZ
  • Contact author: John N. Caviness, Department of Neurology, Mayo Clinic, 13400 E. Shea Boulevard, Scottsdale, AZ 85259. Email: jcaviness@mayo.edu
Article Information
Speech, Voice & Prosodic Disorders / Special Populations / Older Adults & Aging / Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   November 14, 2016
Analysis of High-Frequency Electroencephalographic-Electromyographic Coherence Elicited by Speech and Oral Nonspeech Tasks in Parkinson’s Disease
Journal of Speech, Language, and Hearing Research, November 2016, Vol. 49, 424-438. doi:10.1044/1092-4388(2006/033)
History: Received January 25, 2005 , Revised June 10, 2005 , Accepted October 10, 2005
 
Journal of Speech, Language, and Hearing Research, November 2016, Vol. 49, 424-438. doi:10.1044/1092-4388(2006/033)
History: Received January 25, 2005; Revised June 10, 2005; Accepted October 10, 2005
Web of Science® Times Cited: 6

Purpose Corticomuscular electroencephalographic-electromyographic (EEG-EMG) coherence elicited by speech and nonspeech oromotor tasks in healthy participants and those with Parkinson’s disease (PD) was examined. Hypotheses were the following: (a) corticomuscular coherence is demonstrable between orbicularis oris (OO) muscles' EMG and scalp EEG recording; (b) the presence, location, and magnitude of coherence is task specific; (c) differences in corticomuscular coherence patterns exist between healthy and PD participants; and (d) differences will manifest as either increased or decreased coherence values in certain frequency bands, with EEG localization at primary sensorimotor cortex and/or supplementary motor area (SMA).

Method Simultaneous EEG, EMG (OO), and speech samples were recorded on 20 healthy and 20 PD participants during speech and nonspeech tasks. Fast Fourier transform and coherence analysis was performed with Neuroscan software on 1,000 randomly generated epochs per task per group. Corticomuscular coherence was analyzed between each EEG electrode and right and left superior and inferior OO muscles up to 200 Hz. Significant coherence peaks exceeded 95% confidence limits (.003).

Results Corticomuscular coherence existed for both groups and for all tasks, but to varying degrees in primary sensorimotor cortex and SMA.

Conclusions Results support task specificity for both groups and, in PD, a diminished modulation flexibility linked to the sensorimotor area and reduced corticomuscular coherence at the SMA.

Acknowledgments
We gratefully acknowledge the funding and support of Beth and Larry Johnson. We extend our thanks to Laura Parsons for her significant contribution to data collection. Portions of this article were presented at the Biennial Conference on Motor Speech in February 2004 in Albuquerque, NM.
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