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KMID : 1036820170220030578
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Communication Sciences & Disorders
2017 Volume.22 No. 3 p.578 ~ p.586
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Effects of Vowel Context and Stimulus Length on Test-Retest Nasalance Variability between Children and Adults with Normal Speech
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Ha Seung-Hee
Shin Il-San
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Abstract
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Objectives: This study aims to investigate whether test-retest nasalance scores are different between children and adults and influenced by vowel context and stimulus length.
Methods: The participants were twenty adults and thirty children age 4 to 5 years with normal speech. They repeated each speech stimulus twice after an examiner without head-gear reposition. The speech stimuli consisted of 4-, 8-, 16-, and 31-syllable sets and each set was loaded with high, low, and mixed vowels. Absolute differences between the nasalance scores from the first and second recordings were obtained to see the effect of vowel context and stimulus length on variability in nasalance between the groups.
Results: Variability in nasalance scores was influenced by vowel context and stimulus length and there was no significant difference between children and adults. There were no significant interactions between the variables. Post hoc tests revealed that nasalance difference scores in the high vowel context were greater than those in the low and the mixed vowel contexts. Also, 4-syllable stimuli showed greater nasalance differences scores than 16- and 31-syllable stimuli. More adults and children exhibited greater than 5 nasalance difference points for the 4-syllable stimulus in the high vowel context.
Conclusion: The study suggested that test-retest nasalance variability would become greater as the ratio of the high vowels increases and stimulus length is shorter. For clinical purposes, it is necessary to measure nasalance scores at least twice for the identical speech stimuli.
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KEYWORD
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Nasalance scores, Vowel context, Stimulus length, Adults, Children
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