Effect of Fundamental Frequency on Vowel Perception in Young Children and Infants.

概要

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The process of human speech perception shows marked features of normalizing various variations in speech sounds. Among these is the normalization of vocal tract size effect on the vowel formants. In relation to this normalization ability, effect of fundamental frequency in vowel perception in young children and infants was examined and compared with that in adults. A series of vowels ranging from /o/-/a/ were synthesized with two different fundamental frequencies (100Hz and 220Hz) and the influence of the fundamental frequency on response boundaries were examined. Results show that young children of ages 3 to 5 show clear shift of the response boundary. The amount of shift tends to be greater than that for adults. Experiments on infants using a head turn technique also confirmed similar effect of fundamental frequency in infants.
日本音声言語医学会の論文