日本語学習者のAcademic Speakingの特徴に関する量的研究

―上位群・下位群・母語話者の比較を通して―

抄録

Research on academic speaking has not been developed as much as research on other academic skills. Research on academic speaking in Japanese has focused on structure and grammar, but very few studies have investigated learners' linguistic performance and proficiency in Japanese. Therefore, there is a need for research on linguistic proficiency characteristics, especially complexity, accuracy, and fluency (CAF). In this study, the CAF characteristics of Japanese learners were analyzed by upper- and lower- level groups and compared with those of native speakers of Japanese. The findings showed that CAF's for complexity and fluency was related to the evaluation by Japanese native speakers. This indicates that a learner's CAF is influenced by vocabulary, the number of AS-Units, clauses, and pauses. Learners used fewer words and more pauses than Japanese native speakers due to their paying attention to their speech's accuracy and content. In addition, there was a difference in the complexity of speech between the upper and lower groups of learners. The upper group of the participants used more compound sentences, while the lower group used simple sentences.