Weismer G, Elbert M
J Speech Hear Res. 1982 Jun;25(2):275-87. doi: 10.1044/jshr.2502.275.
This paper reviews instrumental studies of "functional" misarticulations in children and reports an experiment involving acoustic measures of the duration of normally articulated and misarticulated /s/. Three subject groups (n = 7 in each group) included normally articulating adults, normally articulating children, and children who misarticulate the /s/ sound. Multiple repetitions of nonsense sequences containing /s/ were obtained from each subject, and group and individual subject comparisons were based on means, standard deviations, and the derived coefficient of variation associated with /s/ duration. Results indicate that /s/ durations of misarticulating children are significantly more variable than those of normally articulating children, and that this difference is more striking in /s/-stop clusters than in the case of singleton /s/. The possibility is raised that the variability differences between the two child groups may reflect differences in speech motor control capabilities. It is suggested that such control differences should predict temporal variability differences between the two child groups for sounds which are articulated correctly by children in both groups. In addition, these variability differences should be observed for the spectral dimension of speech sound production, since this measure is sensitive to control of articulatory configuration.
本文回顾了关于儿童“功能性”发音错误的仪器研究，并报告了一项实验，该实验涉及对正常发音和发音错误的/s/音持续时间的声学测量。三个受试者组（每组n = 7）包括正常发音的成年人、正常发音的儿童以及/s/音发音错误的儿童。从每个受试者那里获取了多次包含/s/的无意义序列重复，并且基于均值、标准差以及与/s/持续时间相关的导出变异系数进行组间和个体受试者比较。结果表明，发音错误儿童的/s/持续时间比正常发音儿童的/s/持续时间显著更具变异性，并且这种差异在/s/ - 塞音组合中比在单一个体/s/的情况下更为显著。由此提出一种可能性，即两个儿童组之间的变异性差异可能反映了言语运动控制能力的差异。有人认为，对于两组儿童都能正确发音的声音，这种控制差异应该能够预测两个儿童组之间的时间变异性差异。此外，对于语音产生的频谱维度也应该观察到这些变异性差异，因为该测量对发音配置的控制很敏感。
