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Peer reviewedVihman, Marilyn May; Greenlee, Mel – Journal of Speech and Hearing Research, 1987
The persistence of individual differences in phonological development of 10 normally developing children observed at age one and again at age three was studied. The children differed considerably in rate of vocabulary acquisition and relative phonological maturity and also in their general approach to learning. (Author/JDD)
Descriptors: Cognitive Style, Early Childhood Education, Individual Differences, Longitudinal Studies
Steffens, Michele L.; And Others – American Journal on Mental Retardation, 1992
The development of early vocalizations was investigated with 13 infants who had Down's syndrome and 27 infants developing normally, at bimonthly intervals from 4 to 18 months of age. Both groups demonstrated increased production of mature syllables over time as well as large variations in vocal development, both within and across groups and across…
Descriptors: Child Development, Comparative Analysis, Downs Syndrome, Individual Differences
