Lehman M E
Department of Communication Disorders, Central Michigan University, Mt. Pleasant 48859.
Percept Mot Skills. 1993 Oct;77(2):471-81. doi: 10.2466/pms.1993.77.2.471.
Vowel duration in open and closed syllables was investigated in groups of ten normal 5-, 8-, and 10-year-old children, and adults. Productions of three syllables (bee, bead, beet), analyzed acoustically for vowel duration, indicated that for all age groups, mean vowel durations for "bee" and "bead" were significantly different from "beet" but were not different from each other. Developmental effects were noted in mean and variability of vowel duration. In addition, a context effect was observed, with adult-like values for both mean and variability obtained at an earlier age for "beet" than for "bee" and "bead." These results suggest that both phonemic and phonetic factors are important in accounting for developmental changes in mean and variability of vowel duration.
对10名5岁、8岁、10岁的正常儿童以及成人组成的群体，研究了开音节和闭音节中的元音时长。对三个音节（bee、bead、beet）的发音进行声学分析以获取元音时长，结果表明，对于所有年龄组，“bee”和“bead”的平均元音时长与“beet”显著不同，但彼此之间没有差异。在元音时长的平均值和变异性方面发现了发育效应。此外，还观察到一种语境效应，即与“bee”和“bead”相比，“beet”在更早的年龄就获得了类似成人的平均值和变异性。这些结果表明，音素和语音因素在解释元音时长平均值和变异性的发育变化方面都很重要。
