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Variations in adductor spasmodic dysphonia: acoustic evidence
C M Sapienza1, T Murry, W S Brown
1Department of Communication Sciences and Disorders, University of Florida, Gainesville, Florida 36207, USA.
Summary
Acoustic analysis identified specific vocal events like aperiodic segments, frequency shifts, and phonatory breaks in women with adductor spasmodic dysphonia (ADSD), aiding in differentiating their voices from healthy individuals.
Area of Science:
- Speech and Hearing Sciences
- Acoustic Phonetics
- Laryngology
Background:
- Adductor spasmodic dysphonia (ADSD) is a voice disorder characterized by involuntary vocal fold spasms.
- Objective acoustic measures are crucial for understanding and diagnosing voice pathologies.
- Differentiating ADSD from normal voice requires precise acoustic event identification.
Purpose of the Study:
- To investigate acoustic events in adductor spasmodic dysphonia (ADSD).
- To determine if acoustic parameters can differentiate ADSD voices from normal voices.
- To analyze the characteristics and location of specific acoustic events in ADSD.
Main Methods:
- Acoustic analysis of sustained vowel productions.
- Comparison between 14 women with ADSD and 14 age-matched healthy women.
- Measurement of phonatory breaks, aperiodicity, and frequency shifts.
Main Results:
- Phonatory breaks, aperiodicity, and frequency shifts were present in women with ADSD.
- Aperiodic segments were the primary acoustic characteristic, followed by frequency shifts and phonatory breaks.
- These acoustic events were predominantly located in the midportion of vowel productions.
Conclusions:
- Acoustic analysis effectively identifies key vocal events in ADSD.
- Specific acoustic parameters can aid in differentiating ADSD from normal voice.
- Analyzing these spasmodic events offers insights into laryngeal motor control in ADSD.