In view of recent typological work revealing important intra-typological variations among verb-framed languages in motion expression, we investigated children's acquisition of caused motion events in Uyghur. Four-, 6-, 8-, and 10-year-old children and adults participated in a cartoon narration task, and analyses of data in terms of syntactic packaging, semantic density, and information focus showed that, while children's use of packaging strategies involving complex syntax (i.e., subordination) - previously found to be challenging for children speaking verb-framed languages - was adult-like from age 8, they continued to diverge from the adult patterns for measures of semantic density and information focus at age 10. We take this developmental asymmetry as emanating from different kinds of knowledge entailed in encoding motion and suggest that they may be on different developmental timelines because they demand differential amount of experience with a language.
Usage-based theories of children's syntactic acquisition (e.g., Tomasello, 2000a) predict that children's abstract lexical categories emerge from their experience with particular words in constructions in their input. Because modifiers in English are almost always prenominal, children might initially treat adjectives similarly to nouns when used in a prenominal position. In this study, we taught English-speaking preschoolers (between 2 and 6 years) novel nouns (object labels) and adjectives (words referring to attributes) in both prenominal and postnominal positions. The children corrected both postnominal adjectives and nouns to prenominal position, but corrected modifying nouns more often than adjectives. These results suggest that children differentiate between nouns and adjectives even when they occur in the same position and serve the same function (i.e., modification). Children were increasingly likely to correct postnominal adjectives (not nouns) with increasing age. We argue that children attend to word order more when it makes a difference in meaning.

