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The development of the speech production system was investigated using a crosssectional design that included children aged 4–14 years and adults. Given that the size and internal structure of the laryngeal and respiratory systems differ between children and adults, it was predicted that children would show functional distinctions from adults during speech. Aerodynamic, acoustic, and respiratory kinematic techniques were used to assess laryngeal and respiratory function while participants varied their sound pressure level. In general, the aerodynamic and acoustic results show that men and 14-year-old boys function differently than women and all other groups of children. For the respiratory function data, children's values are similar to adults' by the time they are 12–14 years of age. These changes correspond closely to developmental laryngeal and respiratory anatomic data. All participants used a combination of laryngeal and respiratory mechanisms to increase sound pressure level, but the combination of mechanisms differed across age groups. These data emphasize that the laryngeal and respiratory behavior of children is not easily predicted from an adult model.
KEY WORDS: development, women, laryngeal, respiratory
Submitted on April 30, 1996
Accepted on December 3, 1996
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