Phonation types in production of phonological tone: the case of Green Mong

This study looks at the relative importance of phonation type in identifying tones in languages with a ‘mixed’ pitch/phonation tone system. Green Mong is a tone language with an inventory of 7 contrastive tones and a tonal system that incorporates both fundamental frequency (FO) and phonation type distinctions. The study examines 3 Green Mong tones, which have similar FO contours and are characterized by the distinctive use of breathy, creaky and modal phonation. Acoustic analyses of 3 male and 3 female speakers' productions indicate that the tones are distinguished by their FO, relative amplitude of lower and higher harmonics (H1-H2), vowel duration, vowel quality and voice onset times. Discriminant analyses, used to estimate the relative value of these different cues, indicate that H1-H2 is the best predictor of tone category membership. This is the case for both high and low vowels, although the magnitude of the H1-H2 difference is substantially smaller for high vowels. The 2 predictor variables which are next most strongly correlated with the discriminant functions also relate to phonation type. However, FO does continue to play a role in classification of tokens into tone categories.