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Twins’ Vocabulary Development between 12th and 36th Month: A Case Study

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This study investigated Korean twin children's vocabulary development between 12th and 36th month. The targeted data for analysis are the changes of MLU(Mean Length of Utterance), type-token (frequency) rate, the growth of vocabulary, and the emergence of two-word structures and their pragmatic functions. As a case study, the author, who is the father of the participating twins, observed them all day long and gathered the data from the full range of their everyday experiences. This study found that during the targeted period of language development, the participants showed longer MLU and sheer growth of vocabulary, which is above the normal range of vocabulary growth of Korean children. By analyzing the type-token ratios of the participants, the study found that the combinations of ‘subject+verb' and ‘subject+ adjective' are the most popular syntactic constructions of this target period. This study also paid attention to the emergence of ‘Noun+X' structures, which is one of the most primal syntactic structures of this stage. The significance of these results is discussed

Abstract

This study investigated Korean twin children's vocabulary development between 12th and 36th month. The targeted data for analysis are the changes of MLU(Mean Length of Utterance), type-token (frequency) rate, the growth of vocabulary, and the emergence of two-word structures and their pragmatic functions. As a case study, the author, who is the father of the participating twins, observed them all day long and gathered the data from the full range of their everyday experiences. This study found that during the targeted period of language development, the participants showed longer MLU and sheer growth of vocabulary, which is above the normal range of vocabulary growth of Korean children. By analyzing the type-token ratios of the participants, the study found that the combinations of ‘subject+verb' and ‘subject+ adjective' are the most popular syntactic constructions of this target period. This study also paid attention to the emergence of ‘Noun+X' structures, which is one of the most primal syntactic structures of this stage. The significance of these results is discussed

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