The alignment of F0 tonal targets under changes in speech rate in Drehu

This study investigates fundamental frequency alignment to segmental landmarks in Drehu, an Oceanic language. The authors present a production experiment that aimed to evaluate the marking of prosodic prominence, and in particular, the tonal marking of prominence, within the autosegmental-metrical phonology, since stress and prominence system of the language has not been phonetically investigated. A rate manipulation paradigm was chosen to test the segmental anchoring hypothesis, namely, to see whether prominence lending tonal movements exhibit a constant slope due to rate manipulation and whether tonal targets can be associated to segmental anchoring points in the speech stream. The authors find that a rising tonal movement, between a word initial low (L), and a word final high (H) tone, is the most frequent tonal pattern. The word initial L tone seeks to align with the left edge whereas the H tone, at the right edge, seeks to anchor to the last full syllable. In fast speech, tonal targets are produced closer together but the slope remains constant in both speech rates. High tones seek to anchor to the word-final syllable, yet not to any specific segment which suggests a weak version of the segmental anchoring hypothesis applies.