Numerical morphology supports early number word learning: Evidence from a comparison of young Mandarin and English learners.

Previous studies showed that children learning a language with an obligatory singular/plural distinction (Russian and English) learn the meaning of the number word for one earlier than children learning Japanese, a language without obligatory number morphology (Barner, Libenson, Cheung, & Takasaki, 2009; Sarnecka, Kamenskaya, Yamana, Ogura, & Yudovina, 2007). This can be explained by differences in number morphology, but it can also be explained by many other differences between the languages and the environments of the children who were compared. The present study tests the hypothesis that the morphological singular/plural distinction supports the early acquisition of the meaning of the number word for one by comparing young English learners to age and SES matched young Mandarin Chinese learners. Mandarin does not have obligatory number morphology but is more similar to English than Japanese in many crucial respects. Corpus analyses show that, compared to English learners, Mandarin learners hear number words more frequently, are more likely to hear number words followed by a noun, and are more likely to hear number words in contexts where they denote a cardinal value. Two tasks show that, despite these advantages, Mandarin learners learn the meaning of the number word for one three to six months later than do English learners. These results provide the strongest evidence to date that prior knowledge of the numerical meaning of the distinction between singular and plural supports the acquisition of the meaning of the number word for one.

Language and Literacy Development of Dual Language Learners Growing Up in the United States: A Call for Research.

Statistics show that many dual language learners (DLLs) growing up in the United States are at risk for poor educational outcomes. As a result, national attention has focused on the promotion of DLLs' academic abilities, beginning in the preschool years. Despite this interest, our understanding of DLLs' language and literacy development is limited. The purpose of this article is to discuss the current state of knowledge about the language and literacy development of DLLs during early childhood, and to present a research agenda designed to enhance the field's understanding of DLLs' development, which, in turn, can help improve the educational outcomes of children who are learning two languages.

Acquisition of english grammatical morphology by native mandarin-speaking children and adolescents: age-related differences.

PURPOSE: This 5-year longitudinal study investigated the acquisition of 6 English grammatical morphemes (i.e., regular and irregular past tense, 3rd person singular, progressive aspect -ing, copula BE, and auxiliary DO) by 10 native Mandarin-speaking children and adolescents in the United States (arrived in the United States between 5 and 16 years of age). The goals were to chart and compare the acquisition trajectories and levels of mastery across the morphemes, identify when age-related differences emerged and which forms they took. METHOD: Morphological proficiency was measured by the accuracy of these morphemes in obligatory contexts during spontaneous speech. RESULTS: The morphemes were mastered by different numbers of participants and showed different growth trajectories. Performance variance was partially predicted by age of arrival (AoAr) in the United States, with early arrivals achieving greater proficiency than late arrivals. However, such AoAr effects took several years to occur and only existed for 2 of the 6 morphemes (i.e., 3rd person singular and regular past tense). Growth curve analysis revealed that language environment was a stronger predictor of individual differences than AoAr. Results did not uncover age-related differences in the acquisition of tense versus non-tense-related morphemes, nor in regular versus irregular morphemes, nor in the error types. CONCLUSION: Findings support an Environmental account for age-related differences in 2nd language (L2) morphological acquisition. Results also indicate that the acquisition of some grammatical morphemes by school-aged immigrants takes several years to complete. As L2 learners exhibit some error types and difficulties similar to monolingual children with specific language impairment, caution needs to be taken when interpreting and using morphological errors as indicators of speech/language learning problems in this population.

Action naming in Spanish and English by sequential bilingual children and adolescents.

PURPOSE: Verb processing in early sequential Spanish-English bilinguals was investigated. Primary study goals were to identify potential patterns of development in relative levels of verb processing efficiency in a 1st (L1) and 2nd (L2) language and to investigate factors influencing cognitive control of the dual-language system in developing bilinguals. METHOD: Four age groups of early sequential Spanish-English bilinguals (5-7 years, 8-10 years, 11-13 years, and 14-16 years of age) named action pictures in single-language (Spanish or English) and mixed-language (alternating Spanish and English) conditions. Dependent variables were accuracy and response time (RT). RESULTS: Action-naming proficiency improved in both L1 and L2 with age, with a shift from L1 to L2 dominance in accuracy. In comparison with the single-language condition, the mixed-language condition engendered slower RT for all age groups and lower accuracy for the 3 younger age groups. The oldest age group did not show accuracy difference between the conditions. CONCLUSIONS: These general patterns of verb processing across age, language, and processing conditions replicated and enriched previous findings of noun processing in similar populations (K. J. Kohnert, E. Bates, & A. E. Hernandez, 1999). However, verb processing was considerably slower and less accurate than noun processing. Theoretical and applied implications of these findings are discussed.

Perception and production of English vowels by Mandarin speakers: age-related differences vary with amount of L2 exposure.

In this study we assessed age-related differences in the perception and production of American English (AE) vowels by native Mandarin speakers as a function of the amount of exposure to the target language. Participants included three groups of native Mandarin speakers: 87 children, adolescents and young adults living in China, 77 recent arrivals who had lived in the U.S. for two years or less, and 54 past arrivals who had lived in the U.S. between three and five years. The latter two groups arrived in the U.S. between the ages of 7 and 44 years. Discrimination of six AE vowel pairs /i-i/, /i-e(I)/, /e-ae/, /ae-a/, /a-(symbol see text)/, and /u-a/ was assessed with a categorial AXB task. Production of the eight vowels /i, i, e(I), e, ae, (symbol see text), a, u/ was assessed with an immediate imitation task. Age-related differences in performance accuracy changed from an older-learner advantage among participants in China, to no age differences among recent arrivals, and to a younger-learner advantage among past arrivals. Performance on individual vowels and vowel contrasts indicated the influence of the Mandarin phonetic/phonological system. These findings support a combined environmental and L1 interference/transfer theory as an explanation of the long-term younger-learner advantage in mastering L2 phonology.

The acquisition of the English plural morpheme by native Mandarin Chinese-speaking children.

Although the acquisition of the English plural morpheme by monolingual English-speaking children (L1 learners) has been studied extensively, little is known about the processes through which native speakers of other languages (L2 speakers) acquire the English plural morpheme. To understand the similarities and differences between L1 and L2 English plural morpheme acquisition, 10 native Mandarin-speaking children who immigrated to the United States between ages 5 and 16 years were followed for 5 years. Their proficiency in English plural morpheme production was measured by a picture description task and by their spontaneous speech. In contrast to L1 learners who master the plural morpheme within 3 years of age, only 7 of these 10 L2 learners did so after 5 years of English exposure. Age of initial exposure to English and language environment explained individual differences to some extent. Participants' speech illustrated all error types made by L1 learners; however, L2 learners more frequently marked the same noun inconsistently in the same testing session, and more often overgeneralized the plural morpheme in singular or mass noun contexts. Differences between L2 learners and L1 learners with specific language impairment are also discussed.