Time-Frequency Analyses of Thyroarytenoid Myoelectric Activity in Normal and Spasmodic Dysphonia Subjects Digital recordings of thyroarytenoid (TA) myoelectric activity (via percutaneous hooked-wire electrodes) were obtained for 10 normal control subjects and 10 subjects with spasmodic dysphonia during performance of five tasks of varying complexity: quiet breathing, Valsalva maneuver, whispered /i/, voiced /i/, and “beep beep went the heap.” Time-frequency power spectral density ... Research Article
Research Article  |   April 01, 1995
Time-Frequency Analyses of Thyroarytenoid Myoelectric Activity in Normal and Spasmodic Dysphonia Subjects
 
Author Affiliations & Notes
  • Rick M. Roark
    Department of Otolaryngology New York Medical College Valhalla and New York Eye & Ear Infirmary Manhattan
  • Eric M. Dowling
    Department of Electrical Engineering & Computer Science University of Texas at Dallas Richardson
  • Ronald D. DeGroat
    Department of Electrical Engineering & Computer Science University of Texas at Dallas Richardson
  • Ben C. Watson
    Department of Otolaryngology New York Medical College Valhalla and New York Eye & Ear Infirmary Manhattan
  • Steven D. Schaefer
    Department of Otolaryngology New York Medical College Valhalla and New York Eye & Ear Infirmary Manhattan
  • Contact author: Rick M. Roark, PhD, Department of Otolaryngology, New York Medical College, 170 Munger, Valhalla, New York, 10595. Internet: roark@nymc.edu
Article Information
Speech, Voice & Prosodic Disorders / Voice Disorders / Special Populations / Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   April 01, 1995
Time-Frequency Analyses of Thyroarytenoid Myoelectric Activity in Normal and Spasmodic Dysphonia Subjects
Journal of Speech, Language, and Hearing Research, April 1995, Vol. 38, 289-303. doi:10.1044/jshr.3802.289
History: Received April 20, 1994 , Accepted October 3, 1994
 
Journal of Speech, Language, and Hearing Research, April 1995, Vol. 38, 289-303. doi:10.1044/jshr.3802.289
History: Received April 20, 1994; Accepted October 3, 1994

Digital recordings of thyroarytenoid (TA) myoelectric activity (via percutaneous hooked-wire electrodes) were obtained for 10 normal control subjects and 10 subjects with spasmodic dysphonia during performance of five tasks of varying complexity: quiet breathing, Valsalva maneuver, whispered /i/, voiced /i/, and “beep beep went the heap.” Time-frequency power spectral density functions, PSD(f, t), were determined for a selected segment of the signals, and measures of median frequency, mean frequency, bandwidth, and center frequency of PSD(f, t) were derived for each sample point. Statistical median, mean, standard deviation, minimum, maximum, and mode of the power spectral density measures were computed to compose feature vectors for each TA myoelectric recording. Statistical pattern recognition procedures using maximum likelihood classification tests were applied to the feature space to discriminate disordered from normal speakers for each task. Findings indicate a high level of discriminability between subject groups for phonated speaking tasks in contrast to low levels of discriminability for whispered and nonspeech tasks. Graphical presentations of three-dimensional PSD(f, t) plots are given that illustrate changes in spectral characteristics of TA EMG at the onset of laryngospasm.

Acknowledgments
Data analysis of this work was supported by NSF grant MIP9203296. Data collection was supported by NIH grant DC00410. The authors wish to thank Nancy Pearl Solomon at the University of Iowa, and two anonymous reviewers, for their many useful comments and suggestions.
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