A comparison of parents' models and expansions in promoting children's acquisition of adjectives

This study investigated the effects of parental models plus nondifferential praise and expansions plus nondifferential praise on 2-year-old children's spontaneous use of color and size adjective-noun combinations. Mothers modeled either a color or size adjective-noun combination and expanded the other. Both parental models and expansions increased the children's spontaneous use of the target adjective-noun combinations, but expansions produced a stronger effect than models. These results, and naturalistic data indicating that parents often provide a large number of expansions for their children, suggest that expansions may play an important role in normal language development.