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The relationship between spectral characteristics and perceived hypernasality in children.

R Kataoka1, D W Warren, D J Zajac

  • 1UNC Craniofacial Center, University of North Carolina at Chapel Hill, 27599-7450, USA. kataoka@senzoku.showa-u.ac.jp

The Journal of the Acoustical Society of America
|June 2, 2001
PubMed
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This study quantifies hypernasality in children using acoustic analysis. Specific spectral amplitudes in the vowel [i] accurately predict perceived hypernasality severity.

Area of Science:

  • Speech-Language Pathology
  • Acoustic Phonetics
  • Pediatric Audiology

Background:

  • Hypernasality is a speech disorder often associated with cleft palate.
  • Objective quantification of hypernasality is crucial for diagnosis and treatment.
  • Existing methods may not fully capture perceptual nuances of hypernasality.

Purpose of the Study:

  • To quantify perceived hypernasality in children using acoustic measures.
  • To identify specific spectral characteristics associated with hypernasality.
  • To establish reliable acoustic parameters for hypernasality assessment.

Main Methods:

  • Collected one-third octave spectra of the isolated vowel [i] from children with and without cleft palate.
  • Experienced listeners rated hypernasality severity on a 6-point scale.

Related Experiment Videos

  • Used multiple regression analysis to correlate spectral amplitudes with perceptual ratings.

    • Main Results:

    • Identified spectral characteristics of hypernasality: increased amplitudes between F1 and F2, decreased amplitudes near F2.
    • Found a high correlation (R = 0.84) between specific 1/3-octave band amplitudes (1, 1.6, 2.5 kHz) and perceived hypernasality.
    • Increased amplitudes at 1-1.6 kHz and decreased amplitude at 2.5 kHz correlated with increased hypernasality.

    Conclusions:

    • The amplitudes of specific 1/3-octave bands are effective acoustic parameters for quantifying hypernasality.
    • This method provides an objective measure for assessing hypernasality in children.
    • Findings support the use of acoustic analysis for clinical evaluation of hypernasality.