Study of Articulatory Interaction between Native and Non-native phonemes by use of EPG and Acoustic analysis

分析了日语母语者所说的日语音素、非母语英语/r/和/L/的巴-语接触模式。利用多维尺度(MDS)生成的音素图分析了这些音素的腭舌接触模式之间的相互相似性，并比较了这些接触模式的变化速度。对以英语为母语的成年人进行了非母语言语辨别的视听培训，使用了母语为英语的人发音90个rl单词对的视听录音，并分析了母语和非母语语音对比的发音、听觉、知觉和皮层表征的变化。/r/和/L/从地图上相距甚远的两位优秀的英语演讲者那里录制下来。英语发音/L/日语发音/r/高于英语发音/r/。说英语好的人接触模式的变化速度也更接近日语/r/，而不是英语/r/。这些结果表明，发音动作和语音的知觉分类依赖于听者特定的语言，但分类可以通过训练进行可塑性修改。在这些发现的基础上，讨论了声学方法在正确评估发音障碍的交际价值方面的作用。这些结果表明，对腭舌接触模式的发音分析为语言习得提供了有用的信息。

Palato-lingual contact pattems were analyzed for Japanese phonemes, non-native English/r/, and /l/ uttered by native Japanese speakers. Mutual similarities between the palatolingual contact patterns for the phonemes were analyzed using a phoneme map generated by a multi-dimensional scaling(MDS), and variation speed in the contact patterns was compared. Audiovisual training in non-native speech discrimination was conducted on native Japanese adults using audiovisual recordings of native English speakers articulating 90 rl word pairs, and analysis of changes in articulatory, acoustical, perception and cortical representations of native and non-native phonetic contrasts was performed. Utterances of English /r/ and /l/ recorded from two excellent speakers of English dearly separated from each other on the map. Utterances of English /l/ positioned doser to those of Japanese /r/ than those of English/r/. The variation speed in the contact pattems was also closer to that of Japanese /r/ than English /r/ for the excellent speakers of English. These results indicated that perceptual categorization of articulatory movements and resulting phonetic sounds is listenerdependent in a language-specific way, but categorization can be plastically modified even in adulthood through training.Based on these findings, the usefulness of acoustic approaches for proper assessment of communicative values of articulations of disordered is discussed. These results suggested that articulatory analyses of palatolimgual contact patterns provide useful information on the language acquisition.