From being a relatively neglected area in the study of second language learning, the acquisition of second language speech has emerged over the last decade as an important research field with a wide range of approaches; the traditions of articulatory, acoustic, perceptual, phonetic, phonological, and psycholinguists investigation contribute a rare interdisdplinarity to this area of linguistic inquiry. Current scholarly interest augurs well for future theoretical advances.
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Leather et al. (1991) studied this question.
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