Tulloch, Michelle K.

Learning to read is a fundamental skill that is understudied among children who hear more than one language at home. A particular limitation in the extant literature is that the samples are often Spanish-dominant and come from low-income households. This literature has evidence that Spanish skills – both language-specific (i.e., vocabulary) and language-general (i.e., phonological processing) – predict English reading ability. In the current study, we investigated the effect of oral language skills in both English and Spanish, as well as other pre-literacy skills, on the English reading skill of Spanish-English bilinguals who are English dominant and received English only instruction from school entry. The oral language skills and other pre-literacy skills of 101 Spanish-English dual language learners were assessed at 5 years. English reading skill was measured annually from 6 to 10 years. Latent growth curve analysis was used to model initial English reading skill at 6 years and the growth of English reading skill from 6 to 10 years. Four sets of hypothesized foundational skills measured at child age 5 years were tested as predictors of subsequent English reading skill: (1) English oral language skills, (2) Spanish oral language skills, (3) English and Spanish oral language skills, and (4) English and Spanish oral language skills, with other pre-literacy skills. The results of structural equation modeling indicated that English vocabulary and phonological awareness measured in Spanish were significant predictors when English and Spanish skills were entered separately. When English and Spanish oral language skills were included together, Spanish oral language skills did not explain English reading growth better than when oral language skills were modeled independently. The best model of predictors of English reading for bilingual 5-year-olds included only English vocabulary and English letter recognition.

Code-switching is a common feature of bilingual language use and has multiple factors that influence the frequency and type of code-switching. 56 Spanish-English bilingual children recorded sessions of Spanish-designated and English-designated interactions with a caregiver at 2.5 and 3.5 years. These sessions were transcribed and coded for all code-switched utterances. At both ages, we found: (1) Children switched to English more frequently than they switched to Spanish. (2) Their degree of English dominance was a positive predictor of their frequency of switching to English, but a negative predictor of their frequency of switching to Spanish. Between 2.5 and 3.5 years, children became more English dominant, and their rate of switching to English increased while their rate of switching to Spanish decreased. The present findings suggest that the strongest influence on bilingual children’s code-switching is their relative proficiency in their two languages and as that proficiency changes, their code-switching changes.