McLeod Sharynne, Hewett Sally R
Charles Sturt University, Bathurst, Australia.
Folia Phoniatr Logop. 2008;60(4):163-72. doi: 10.1159/000127835. Epub 2008 Apr 24.
Variability describes speech differences within individual children, as well as differences between children. Variability within children has been used as an indicator of speech impairment, so knowledge of typical children's variability enhances clinicians' diagnostic and prognostic decisions. This study aimed to describe the extent of variability within children in the production of consonant clusters.
Sixteen typically developing children aged between 2 and 3 years were studied monthly for 6 months. Spontaneous speech samples were used to construct variability profiles for repeated productions of words containing consonant clusters.
Variability between and within individuals featured prominently. Half (53.7%, range 42.4-77.6%) of all the words that were repeated were produced variably. As the children became older, they increased the accuracy of their productions overall; however, variability between and within individuals continued to occur.
If the speech of typically developing children is highly variable, then the extent and nature of variability must be defined when it is used as a diagnostic marker of speech impairment.
变异性描述了个体儿童内部的语音差异以及儿童之间的差异。儿童内部的变异性已被用作言语障碍的一个指标，因此了解典型儿童的变异性有助于临床医生做出诊断和预后判断。本研究旨在描述儿童在产生辅音连缀时的变异程度。
对16名年龄在2至3岁之间发育正常的儿童进行为期6个月的每月一次研究。使用自发言语样本构建包含辅音连缀的单词重复发音的变异图谱。
个体之间和个体内部的变异性都很显著。所有重复的单词中有一半（53.7%，范围为42.4 - 77.6%）发音存在变异。随着儿童年龄增长，他们总体上提高了发音的准确性；然而，个体之间和个体内部的变异性仍继续存在。
如果发育正常儿童的语音具有高度变异性，那么在将其用作言语障碍的诊断标志物时，必须明确变异性的程度和性质。
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