Abstract
The fundamental frequency (F0) and the first three formant frequency (F1, F2, and F3) values of vowels produced by 40 preadolescents were measured. There were five boys and five girls in each of four age groups: 5, 7, 9, and 11 years old. The 11 nondiphthong vowels of Australian English which can be produced in a stressed syllable were used. The F0 values decreased with increases in age, but there was no difference between boys and girls. In general, the F1, F2, and F3 values decreased with increases in age, and the values for girls were higher than those for boys.
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