Abstract

The pilot study described in this paper builds on existing studies of lexical diversity to determine the extent to which learners’ L2 vocabulary proficiency affects the lexical diversity of the texts they produce across three modes of production. To do this, the researcher examined the relationship between first-year students’ (n = 17) L2 vocabulary knowledge, as measured by Webb, Sasao, and Ballance’s (2017) updated Vocabulary Levels Test (uVLT), and the lexical diversity of their academic writing, academic presentations, and academic discussions. The results showed that even learners with higher scores on the uVLT tended not to use those low-frequency words in their academic writing and presentations. As a result, there was no statistically significant correlation between students’ uVLT scores and the lexical diversity of their essays or presentations. However, the analysis did show a statistically significant correlation between vocabulary knowledge and the lexical diversity of their academic discussions. 本稿で検証する予備研究は、語彙の多様性に関する既存の研究を基に、学習者のL2語彙力が三形態にわたるテクスト産出の多様性にどの程度の影響を及ぼすかを明らかにするものである。そのために、本稿ではウェッブ、笹尾、バランス(2017)の語彙レベルテスト更新版(uVLT)で測定した1年生(n = 17)のL2語彙知識と、学術的なライティング、プレゼンテーション、および討論における語彙の多様性との関係を調査した。その結果、uVLTのスコアが高い学習者であっても、低頻出語を学術的ライティングやプレゼンテーションで使用しない傾向が見られた。調査結果では、学生のuVLTスコアと、ライティングやプレゼンテーションにおける語彙の多様性との間には、統計的に有意な相関は認められなかったが、語彙知識と学術的な討論における語彙の多様性との間には、統計的に有意な相関が示された。

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