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KMID : 1022420200120010065
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Phonetics and Speech Sciences
2020 Volume.12 No. 1 p.65 ~ p.74
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A comparative study of the acoustic characteristics of the vowel /a/ between children with spastic and dyskinetic cerebral palsy
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Jeong Pil-Yeon
Sim Hyun-Sub
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Abstract
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This study aims to compare the acoustic characteristics of vowel phonation in children with spastic and dyskinetic cerebral palsy (CP). Thirty-four children aged 4-12 years with CP participated in the study (spastic 26, dyskinetic 8). Voice samples for the acoustic analysis were extracted from a sustained vowel /a/. All acoustic measures were made using Praat. Group differences were compared by an independent t-test or Welch-Aspin test, if the equivalence assumption was not met. The results of this study are as follow. First, maximum phonation time(MPT) was significantly shorter for the dyskinetic CP than for the spastic CP. Second, shimmer percent was significantly increased in the dyskinetic CP than in the spastic CP. Lastly, there were no significant group differences in both the first formant and the second formant. These findings indicate that the dyskinetic CP has a poorer respiratory capacity and poorer laryngeal function than the spastic CP. On the other hand, both groups have a comparable ability to articulate the vowel /a/. The results of the present study help speech language pathologists identify the speech motor control ability of children with two types of CP (spastic and dyskinetic) and help to make an intervention plan associated with a specific type of CP.
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KEYWORD
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cerebral palsy, MPT, Jitter, Shimmer, noise to harmonic ratio (NHR), formant frequency
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