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/, vo...

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Bibliographic Details
Published in:Journal of speech and hearing research 1995-04, Vol.38 (2), p.289-303
Main Authors: Roark, Rick M, Dowling, Eric M, DeGroat, Ronald D, Watson, Ben C, Schaefer, Steven D
Format: Article
Language:English
Subjects:
Adult
Aged
Biological and medical sciences
Electromyography
Female
Humans
Investigative techniques, diagnostic techniques (general aspects)
Laryngeal Muscles - physiopathology
Male
Medical sciences
Middle Aged
Muscle Spasticity - complications
Muscle Spasticity - physiopathology
Otorhinolaryngology functional investigation (larynx, voice, audiometry, vestibular function, equilibration...)
Phonetics
Severity of Illness Index
Sound Spectrography
Speech
Speech Acoustics
Speech disorders
Time Factors
Voice Disorders - complications
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Summary: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.
ISSN:0022-4685
1092-4388
1558-9102
DOI:10.1044/jshr.3802.289