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Spasmodic dysphonia: introductory phonetic analyses.

Eric W Reid1, Christina V Nobriga1

  • 1School of Allied Health, Communication Sciences & Disorders Department, Loma Linda University, Loma Linda, California, USA.

Clinical Linguistics & Phonetics
|July 12, 2022
PubMed
Summary
This summary is machine-generated.

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Adductor spasmodic dysphonia (ADSD) is a neurological voice disorder. This study found spasm frequency in ADSD is linked to syllable stress and word type, not phoneme voicing.

Area of Science:

  • Neurology
  • Speech-Language Pathology
  • Laryngology

Background:

  • Adductor spasmodic dysphonia (ADSD) is a neurological voice disorder involving involuntary laryngeal muscle spasms.
  • Previous research suggested a link between ADSD spasms and phoneme voicing, particularly voiced speech sounds.
  • The complex acoustic and physical nature of speech suggests other phonetic factors may influence spasm frequency.

Purpose of the Study:

  • To investigate the relationship between various phonetic contrasts and spasm frequency in individuals with ADSD.
  • To determine if syllable stress, word type, or other phonetic features influence laryngeal spasm frequency.
  • To re-evaluate the role of phoneme voicing in ADSD spasm occurrence.

Main Methods:

  • Retrospective analysis of standardized speech recordings from 36 participants with ADSD.
Keywords:
Adductor spasmodic dysphoniacontent wordphonetic contextsyllable stressvoicing

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  • Coding of speech productions for syllable stress, voiced/voiceless onset, vowel/consonant onset, and word-onset place and manner.
  • Statistical comparison of phonetic contexts using independent sample t-tests and Kruskal-Wallis tests.

    • Main Results:

    • Spasm frequency significantly varied with syllable stress (stressed vs. unstressed).
    • Spasm frequency differed between content words and function words.
    • Differences in spasm frequency were observed between multisyllabic and monosyllabic words.
    • No consistent connection was found between ADSD spasm frequency and phoneme voicing.

    Conclusions:

    • Syllable stress and word type are significant factors influencing spasm frequency in ADSD.
    • Findings challenge previous reports linking ADSD spasms primarily to phoneme voicing.
    • Results support the clinical utility of standardized sentences for differential diagnosis in ADSD.