Abstract
The bye-bye vocalizations produced by 15 Japanese-reared children and seven American-English-reared children were examined for evidence of the effect of ambient language in the period of first words. Using the lexical age periods of 10-word and 50-word development, bye-bye vocalizations were analysed for overall duration and final syllable lengthening. Results of the analysis indicated a significant difference in overall duration and final syllable lengthening for the Japanese-reared children across the lexical periods, while minimal change was noted among the American-English-reared children. The results obtained for both groups were congruent with features of adult prosody known to exist for the two languages.
Keywords: