What did Roy's study on language development (using his child as his subject) show about the growth of new-word learning over the first two years of life?
Added by Samantha T.
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Step 1: Identify the study — Deb Roy’s “Speechome” project continuously recorded his home environment and his child’s vocalizations during the child’s first years of life to track when and how new words were learned. Show more…
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First-born children tend to develop language skills faster than their younger siblings. One possible explanation for this phenomenon is that first-borns have undivided attention from their parents. If this explanation is correct, then it is also reasonable that twins should show slower language development than single children and that triplets should be even slower. Davis (1937) found exactly this result. The following data represent that relationship. The dependent variable is a measure of language skill at age 3 for each child. Single Child: 10 Twins: Triplets:
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