McGowan Rebecca W, McGowan Richard S, Denny Margaret, Nittrouer Susan
J Speech Lang Hear Res. 2014 Feb;57(1):1-15. doi: 10.1044/1092-4388(2013/12-0112).
Ecologically realistic, spontaneous, adult-directed, longitudinal speech data of young children were described by acoustic analyses.
The first 2 formant frequencies of vowels produced by 6 children from different American English dialect regions were analyzed from ages 18 to 48 months. The vowels were from largely conversational contexts and were classified according to dictionary pronunciation.
Within-subject formant frequency variability remained relatively constant for the span of ages studied. It was often difficult to detect overall decreases in the first 2 formant frequencies between ages 30 and 48 months. A study of the movement of the corner vowels with respect to the vowel centroid showed that the shape of the vowel space remained qualitatively constant from 30 through 48 months.
The shape of the vowel space is established early in life. Some aspects of regional dialect were observed in some of the subjects at 42 months of age. The present study adds to the existing data on the development of vowel spaces by describing ecologically realistic speech.
通过声学分析描述幼儿在符合生态现实、自发、由成人引导的纵向言语数据。
对来自不同美国英语方言地区的6名儿童在18至48个月大时发出的元音的前两个共振峰频率进行分析。这些元音大多来自对话情境，并根据词典发音进行分类。
在所研究的年龄跨度内，个体内部共振峰频率变异性保持相对恒定。在30至48个月龄之间，通常很难检测到前两个共振峰频率的总体下降。一项关于角元音相对于元音质心运动的研究表明，从30个月到48个月，元音空间的形状在质量上保持不变。
元音空间的形状在生命早期就已确立。在42个月大的一些受试者中观察到了区域方言的某些方面。本研究通过描述符合生态现实的言语，为现有的元音空间发展数据增添了内容。
