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QUANTITATIVE ANALYSIS OF DIPLOPHONIC VOCAL FOLD VIBRATORY PATTERN
FROM HIGH-SPEED DIGITAL IMAGING OF GLOTTIS.
Yuling Yan1, Krzysztof Izdebski2, Diane Bless3
1: Santa Clara University, Santa Clara, CA, USA
2: Pacific Voice and Speech Foundation, San Francisco, CA, USA
3: University of Wisconsin-Madison, WI, USA
Purpose: Investigate vocal fold (VF) vibratory properties using quantitative analysis of High Speed Digital Imaging (HSDI) based on Nyquist-plot technology derived from voicing during production of aberrant voice quality (VQ), clinically referred to as diplophonia. Define the mechanism responsible for diplophonia and show how treatment (Tx) effects this VQ and VF behavior and resorts normative phonation.
Method: Pre- and post-Tx HSDI recordings of a female patient with muscular tension dysphonia (MTD) were analyzed using new quantitative analysis system for HSDI that involves tracing of VF edge and generation of glottal waveform and VF displacement, allowing to define quantitative measures of vibratory symmetry and synchronization of VF vibrations, with subsequent analyses of glottal waveforms using Nyquist formula, to reveal vibratory pattern and characteristics of the vocal folds during this aberrant sound production, and later during normative phonation post Tx.
Results: This is first ever HSDI and Nyquist- plot based analyses of aberrant voice known as diplophonia derived here from vocalization of a MTD case. The results showed definitive and specific character of VF vibration responsible for this VQ. HSDI showed specifically that the anterior and posterior aspects of the VF vibrate differently and these vibratory asynchronicities are responsible for the distinct vibratory patterns. During the diplophonic phase, the anterior and mid portion of the VF exhibited a bi-cyclic vibratory pattern, whereas vibration in the posterior portion of the vocal folds was more normal with an extended closed phase or a smaller open quotient (OQ). Conversely, vibrations within the left-right folds were almost symmetrical. Identical analytical formula was applied to analyze the post-Tx voice. The results showed an improved synchronization of the VF vibration pattern and associated positive acoustic changes in post treatment VQ.
Key Words: High-speed digital imaging, vocal-fold vibration, diplophonia, symmetry, GAW, Nyqist plots, MTD, voice quality.
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