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KMID : 1036820150200010072
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Communication Sciences & Disorders
2015 Volume.20 No. 1 p.72 ~ p.84
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The Relationship between Nasality Ratings and Nasalance Scores according to Vowel Context and Speakers’Sex: Sensitivity and Specificity
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Cho Seong-Hyeon
Ha Seung-Hee
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Abstract
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Objectives: This study aimed to evaluate the relationship between perceptual assessment of nasality and nasalance scores and to investigate sensitivity and specificity for Nasometer. This study also investigated how the vowel environment of speech stimuli and speakers’ sex influence the relationship between the two evaluation methods.
Methods: Speech samples in vowel /a/ and /i/ contexts were collected from 25 children with cleft palate and 5 noncleft children. Ten trained listeners were asked to judge the speakers’ recorded speech samples for the degree of hypernasality using equal-appearing interval (EAI) and direct magnitude estimation (DME) scales. Nasalance scores in the sentences were measured from the same speakers using the Nasometer II Model 6450.
Results: The relationships between nasality and nasalance scores using EAI and DME were statistically significant: correlation coefficients in the vowel /a/ context were .61 in EAI and .60 in DME and correlation coefficients in the vowel /i/ context were .56 in EAI and .57 in DME. The sensitivity and specificity in the two vowel contexts were .67-.87 and .73-.83, respectively. The results showed that vowel contexts and speakers’ sex influence the correlation coefficients between nasality and nasalance scores.
Conclusion: The results of this study indicated validity for the use of the Nasometer to supplement the perceptual assessment of hypernasality. However, given that all correlation coefficients were below .70, Nasometer should be carefully used to evaluate the degree of hypernasality. Also, the study suggested that vowel contexts and speakers’ sex affect the correlation between these two assessment methods of hypernasality.
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KEYWORD
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Hypernasality, Nasalance score, Perceptual assessment, Vowel environment
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