Investigating phonetic drifts in L1 vowels

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The phonological L1 influence on L2 has long been the focus of studies on second language acquisition; however, the influence of L2 on L1 hasn’t been examined to the same extent. Therefore, this paper is concerned with how Japanese-Chinese bilinguals altered the L1 Chinese vowel system when learning L2 Japanese. An acoustic experiment was conducted with Mandarin-Chinese monolinguals and Chinese bilinguals learning Japanese as L2 to look at the influence of L2 Japanese on L1 Chinese. The method of analysis in this experiment, the vowel space, compared Mandarin-Chinese monolinguals with Japanese-Chinese bilinguals based on the first (F1) and second (F2) formant frequency, and each F1 and F2 compared whether there are differences between Mandarin-Chinese monolinguals and Japanese-Chinese bilinguals. As a result, it was found that the high back vowel (u), which is a similar sound in Chinese and Japanese, by Japanese-Chinese bilinguals drifted, and this suggests that learning an L2 could enhance the acoustic characteristics of L1 vowels.

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