xerted a significant impact on children, it was limited by the fact that the sample population could not be considered to be representative of the situation in the country. Furthermore, the language measurements of the children at 15 and 24 months old were derived from mother report, rather than standardized testing. Lastly, the observation of the relationship between language stimulation in childcare and the language development of the children might have been due to bi-directional effects. Thus, the children's language development might not necessarily be due to the stimulating environment; rather the children's naturally developing ability could have inspired the caretakers to respond to the children with language stimulating activities (NICHD, 2000, p. 1009).
These results of the NICHD study were also corr
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