The paper examines acoustic timing patterns of word-medial voiceless and voiced singleton and geminate plosives of Yanagawa Japanese, one of the Chikugo varieties of Japanese spoken in the center of Kyushu (Japan). Unlike standard Tokyo Japanese, Yanagawa Japanese is characterized by frequent gemination of any types of consonants including voiced obstruents (e.g., /kuzzoko/ [kuddzoko] “sole, the fish,” /miroɡɡe/ [miɾoɡɡe] “a shell fish”). Five Yanagawa Japanese speakers were recorded. Another five speakers of standard Tokyo Japanese were also recorded as a control group. The stimuli consisted of nonsense words with C1V1C(C)2V2 structure (e.g., /kak(k)a/, /kaɡ(ɡ)a/). The findings suggest that the whole word duration containing geminate consonants was longer in proportion to mora count difference those containing singleton consonants, confirming moraic timing at word level in Yanagawa Japanese. When C2 was a geminate (voiceless or voiced), it lengthened the preceding vowel (V1) and shortened the following one (V2) in both dialects. However, the magnitude of influence of geminates to adjacent vowels was dialect specific: V1 duration in Yanagawa was consistently longer than Tokyo when the following consonant was a geminate. The results of the current study point towards the timing differences in singletons and geminates across Japanese dialects.
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