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Great strides have been made in the field of historical Japono-Ryukyuan studies in the past half century with the shift in the perception of the Ryukyuan languages as mere dialects of Japanese to sister languages that preserve various phonological and morphological features that have been lost in the Japanese subfamily. In particular, the Ryukyuan data has both secured and contributed to reconstructions of Proto-Japono-Ryukyuan vowel system that had been previously based purely on internal reconstruction via Old Japanese and scant examples from Ryukyuan and/or dialect data.

Reevaluating the Diphthong Mergers in Japono-Ryukyuan