日本語母語話者による歯間摩擦音の代用に関する考察

概要

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The interdental substitution in L2 phonology has been of issue in the L2 literature. Interdentalfricatives are not common crosslinguistically. Therefore, they are hard to acquire for L2 learnerswhose L1s lack those sounds. Substitution with the sounds in their native languages is the strategythat learners take, however, the sounds used for substitution differ across languages. AlthoughJapanese uses [s, z] for interdental substitution, languages like Thai use [t, d].In the present study, I investigated the patterns of substitutions in different phonologicalenvironments by recording the speech of Japanese L2 learners of English. The result of theexperiment showed that Japanese learners substitute interdentals with alveolar fricatives. However,they showed a different pattern for word-initial / /. They used [z] and [dz] for word-initial voicedinterdentals. The appearance of [z] and [dz] was in free variation in the output.In this paper, I propose an Optimality Theoretic account for the interlanguage phonologicalphenomenon, and account for the patterns of substitutions as a result of L1 transfer.