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This study illustrates how three level tones might have developed diachronically by comparing two synchronic Mandarin dialects. In Standard Mandarin (SM), the four lexical tones are denoted as /H, LH, L, HL/ or /H, R, L, F/ phonologically. However, based on evidence from two acoustic experiments, this study proposes that the four lexical tones in Taiwan Mandarin (TM) should be analyzed as /H, M, L, HM/, with /H, HM/ in a high register and /M, L/ in a low register. The proposed tonal structure can account for all the tone sandhi in TM using the framework of Optimality theory, and the register difference plays an important role in the analyses. Also, the new TM tonal representation has an advantage in explaining the absence of the SM Tone 2 Sandhi. The new tonal representations illuminate how pitch contour differences might have developed into structural tone changes. [ABSTRACT FROM AUTHOR]

Tone sandhi in Wuxi Chinese involves "pattern substitution," whereby the base tone on the first syllable is first substituted by another tone, then spread to the sandhi domain. We conducted a wug test to investigate native Wuxi speakers' tacit knowledge of tone sandhi and found that the substituion aspect of the sandhi is not fully productive, but the extension aspect is, and sandhi productivity is influenced by the phonetic similarity between base and sandhi tones. These results are discussed in the context of how phonological opacity, phonetic naturalness, and lexical frequency influence phonological learning, and a grammatical learning model that can predict Wuxi speakers' experimental behavior is proposed. [ABSTRACT FROM AUTHOR]