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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
Summary
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.
- 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.
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