外国語副作用は在日中国人留学生にあらわれるのか

Foreign language side-effect (FLSE) is known as a higher interference between thinking and language-use for foreign language than that for one's mother tongue. For international students, who are using foreign language and thinking about others’ opinions to attend discussion, speaking and thinking must be achieved at the same time in terms of discussion situation. Under this condition, it can be inferred that FLSE may be one of the reasons for students feel difficulty in discussion situation. The purpose of this study is to verify whether FLSE occurs on Chinese international students in Japan by using dual-task experimental procedures (Takano, 2013), and to examine the effects of language ability on FLSE. Thirty-two Chinese international students participated in this research. The study mainly revealed the followings: (1) FLSE actually occurred, and Japanese language proficiency has a significant effect on FLSE. It means that higher Japanese language proficiency weakens FLSE’s impact. (2) Both thinking ability and speaking ability declined due to the higher interference of Japanese utilization. However, (3) it also indicates that FLSE may not be shown in someone when it comes to a topic that he/she is not familiar with.