Language Control and Intra-Sentential Codeswitching among Bilingual Children with and without Developmental Language Disorder

The present study investigated bilingual language control among preschool children in a sentence repetition task containing unilingual stimuli and codeswitched stimuli within prepositional phrases (PPs). Cross-language errors, that is, codeswitches that were not part of the stimulus sentences, were taken as evidence of difficulties in language control. Specifically, we investigated cross-language errors as a function of stimulus sentence type (codeswitched or unilingual), CS site within the PP, directionality (English or Hebrew stimulus sentences), and group status (children with typical language development (TLD), and children with Developmental Language Disorder (DLD)). We also examined cross-language errors in terms of word class and locus in the sentence. The participants were 65 English (home language)–Hebrew (societal language) bilinguals with TLD and 13 with DLD, ages 5;5–6;10 (M = 5;11). Stimulus sentences contained five codeswitch conditions within prepositional phrases, for example, a codeswitched preposition (P) or a codeswitched preposition, determiner and noun (P+DET+N), and a ‘no switch’ condition. The stimuli were 36 English and 36 Hebrew sentences (+24 fillers) matched for semantic content and syntax. English sentences contained switches to Hebrew, and Hebrew sentences contained switches to English. The results showed more cross-language errors for codeswitched than unilingual sentence stimuli. The children with TLD showed a directionality effect, producing more cross-language errors in Hebrew sentence stimuli than in English, but the children with DLD did not. The children with DLD had more cross-language errors than their peers with TLD for English stimuli. Most cross-language errors appeared in the sentence-final, adverbial temporal phrase. Findings are discussed in terms of language co-activation and competition in order to account for the difference in performance on unilingual versus codeswitched stimuli and in light of sociopragmatic and psycholinguistic factors to account for the directionality effect among children with TLD and the lack thereof among children with DLD.