Longitudinal changes of formant values and vowel space in two Mandarin-speaking children before 9 years of age

Li Mei Chen, Fan Yin Cheng, Wei Chen Hsu

Research output: Contribution to journalConference articlepeer-review


Vowel productions of 2 Mandarin-speaking children were audio recorded in their homes with picture naming tasks once every 3 months, from birth to 9 years old. The present study is the ninth year of a longitudinal observation. Major findings in this stage are: 1) The trend of decrease in formant values was continuously observed in the boy subject. As for the girl subject, it is not until nine years old, the obvious decrease in formant values was found, especially in F1; 2) F1 values are more stable than F2 values in both subjects. They appeared to acquire jaw movement sooner than tongue movement; 3) Throughout these 9 years, the variability of F1 is around 200-300Hz, and the variability of F2 is 500-700Hz in both subjects. No trend of decrease was found; 4) The trend of shrinkage in F1-F2 vowel area continues from 7 to 9 years old for the boy subject, but not for the girl subject; 5) There is a clear decline in fundamental frequencies at 8-9 years of age in the boy subject. Longitudinal data of vowel formant values from the same group of subjects provides important references for assessment and treatment of articulation disorders in children.

Original languageEnglish
Article number060092
JournalProceedings of Meetings on Acoustics
Publication statusPublished - 2013
Event21st International Congress on Acoustics, ICA 2013 - 165th Meeting of the Acoustical Society of America - Montreal, QC, Canada
Duration: 2013 Jun 22013 Jun 7

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics


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