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Unformatted text preview: Training Japanese listeners to identify English / . / and / ( /: IV. Some effects of perceptual learning on speech production Ann R. Bradlow and David B. Pisoni Speech Research Laboratory, Department of Psychology, Indiana University, Bloomington, Indiana 47405-1301 Reiko Akahane-Yamada and Yohichi Tohkura ATR Human Information Processing Research Laboratories, 2-2 Hikaridai, Seika-cho Soraku-gun, Kyoto, 619-02 Japan ~ Received 16 January 1996; revised 28 August 1996; accepted 22 November 1996 ! This study investigated the effects of training in / . // ( / perceptual identification on / . // ( / production by adult Japanese speakers. Subjects were recorded producing English words that contrast / . / and / ( / before and after participating in an extended period of / . // ( / identification training using a high-variability presentation format. All subjects showed significant perceptual learning as a result of the training program, and this perceptual learning generalized to novel items spoken by new talkers. Improvement in the Japanese trainees / . // ( / spoken utterances as a consequence of perceptual training was evaluated using two separate tests with native English listeners. First, a direct comparison of the pretest and post-test tokens showed significant improvement in the perceived rating of / . / and / ( / productions as a consequence of perceptual learning. Second, the post-test productions were more accurately identified by English listeners than the pretest productions in a two-alternative minimal-pair identification procedure. These results indicate that the knowledge gained during perceptual learning of / . / and / ( / transferred to the production domain, and thus provides novel information regarding the relationship between speech perception and production. 1997 Acoustical Society of America. @ S0001-4966 ~ 97 ! 02404-1 # PACS numbers: 43.71.Hw, 43.71.An, 43.71.Es @ WS # INTRODUCTION The relationship between speech perception and speech production has been a long-standing issue in speech science and experimental phonetics. Some researchers have proposed a direct link between perception and production. For ex- ample, motor theorists ~ e.g., Liberman et al. , 1967; Liberman and Mattingly, 1985; Liberman and Mattingly, 1989 ! claim that listeners perceive speech in terms of their own articula- tory gestures that would produce the perceived sound. A cen- tral tenet of motor theory is that there is a specialized pho- netic module that represents speech units in terms of articulatory gestures, and that this module mediates both speech perception and production. Thus, motor theory sup- poses a single, shared representation for speech perception and production. Other theorists have viewed the two pro- cesses of speech communication as much more autonomous....
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