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This study examines the phonology of a Japanese four-year-old with mildly protracted phonological development (PPD) as a contribution to a special crosslinguistic issue presenting individual profiles in PPD within the framework of constraint-based nonlinear phonology. Although the child’s word structure and vowels were well-established, certain consonant classes presented challenges. Coronal anterior obstruents often showed posteriorization (backing): dorsal stops replaced coronal stops, and with some exceptions, alveolopalatal affricates replaced anterior fricatives and affricates. The feature [+continuant] was also not yet established: palatal and bilabial fricatives and /h/ were either deleted or replaced with glottal stop; and non-anterior affricates replaced coronal fricatives. If affricates are analyzed as a sequence of [-continuant]-[+continuant], they were possible transitional elements from non-continuants to continuants. The profile culminates with suggestions for intervention based on the nonlinear phonological analysis, consistent with other papers in this special issue.

A Japanese 4-year-old with protracted phonological development: the challenge of coronals