ランバッカー スティーヴン ジョージ   LAMBACHER, Stephen G.   LAMBACHER, Stephen G    所属   青山学院大学  社会情報学部 社会情報学科    職種   教授
言語種別	日本語
発行・発表の年月	2010
形態種別	大学・研究所等紀要
標題	A signal detection theorem analysis of native Japanese production of American English vowels
執筆形態	単独
掲載誌名	青山学院大学紀要「青山社会情報研究」
巻・号・頁	1-12頁
概要	The purpose of this paper was to investigate the effects of identification training on the ability of native Japanese to pronounce the five American English (AE) vowels /ae/, /a/, /au/, /uh/, and /er/. A production task, performed both before and after a six-week vowel identification training program, included an experimental group and a control group who produced words containing each of the five target vowels within a varied consonantal context. In a separate task, a group of native speakers of English performed an identification task that included a random sampling of the pre- and post-training productions of the Japanese subjects from each of the two groups. A random sampling of vowel utterances as produced by the group of experimental Japanese talkers were then rated by three native English listeners in a two-interval, forced-choice identification task. A signal detection theorem-based correction for bias served to reveal a different pattern of production results and influenced the interpretation of the data, especially with regard to the /uh/ vowel. The results showed that the trained Japanese group’s productions were more intelligible than the control group’s for each of the five target AE vowels.