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From https://www.lotpublications.nl/the-development-of-prosodic-focus-marking-in-early-bilinguals-l2-a-study-of-bai-mandarin-early-bilinguals-mandarin-2

The Development of Prosodic Focus-marking in Early Bilinguals’ L2: A Study of Bai-Mandarin Early Bilinguals’ Mandarin
By Zenghui Liu
Published by LOT Publications

This dissertation investigates the development of prosodic focus-marking in early bilinguals’ L2 by examining Bai (L1)-Mandarin (L2) early bilingual’s Mandarin. By investigating Bai-Mandarin early bilingual children aged from six to thirteen and bilingual adults, we have established the developmental trajectory and ultimate attainment of prosodic focus-marking in Bai-Mandarin early bilinguals’ Mandarin. We have found both similarities and differences in the route and rate of acquisition of prosodic focus-marking between early bilingual children’s L2 and monolingual children’s L1. Regarding the developmental route, early bilinguals can use duration earlier than pitch for focus-marking purposes, similar to the monolinguals, but their use of prosody to distinguish narrow focus from non-focus is not earlier than distinguishing focus types, different form the monolinguals. Regarding the developmental rate, early bilinguals have not developed similar competence after five years of formal Mandarin education to that of the monolingual four- to five-year-olds. Our results thus provide first evidence that early bilingual children’s L2 acquisition does not completely resemble monolingual children’s L1 acquisition in prosody, similar to findings on phonological acquisition but different from findings on lexical and syntactic acquisition. Furthermore, we have found that Bai-Mandarin early bilingual adults are highly proficient in using duration and pitch-related prosodic cues for encoding focus in Mandarin, but they are not fully Standard Mandarin-like. Our results show that L1 influence (i.e., positive and negative transfer) is evident in the bilinguals’ L2 development, which has been widely observed in bilingual language acquisition in different linguistic domains. Importantly, non-Standard L2 input might also influence the route and rate of acquisition in early bilinguals’ L2 development.

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