Abstract

The purpose of this study is to analyze and describe the development of expressive vocabulary of Korean learners as a heritage language. Therefore, this study will check whether the vocabulary used by Korean learners as a heritage language actually expands from individual to social and professional fields in light of Vygotsky’s theory based on the learners’ corpus data. In this study, the Korean language learners’ corpus was used as research data. Keywords were selected using the TextRank algorithm. As a result, keywords in the individual domain were prominent in beginner, keywords in the social domain in intermediate, and keywords in the social and professional domain in advanced proficiency levels. Through the analysis, it was confirmed that the cognitive development area of heritage learners was expanded from the individual scope to the social, national, and professional domain, and it was possible to confirm the pattern of negotiation between areas. It can be seen that this is in line with the learning aspect of Vygotsky’s social-constructionism.

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