Children continue to develop, refine, and control their motor speech skills while constantly undergoing anatomical and physiological development toward maturity. Parents of child participants were interviewed to ascertain that there were no known or suspected histories of speech, language, hearing or developmental disorders. Research studies have reported that English-speaking children attain adult-like VOT patterns for voiceless stops at a fairly late age e. Kent compiled data on F0 values for children from a number of studies, and reported that sex differences started to emerge before age 11 and F0 declined more gradually for boys around age 11 or 12 years. The sex differences in VOT development in this study may be explained by the physiological and anatomical differences and changes during puberty; however, conclusions should be drawn cautiously as there is not yet extensive consensus in the literature. Accordingly, a higher variability in VOT was observed for multisyllables. Neither the age effect nor interaction effect between age and syllable number was found to be significant. We hypothesized that syllable number would affect stability of VOT productions.
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