Graduate student Michael Obiri-Yeboah and faculty member Sharon Rose have a new paper out in Natural Language and Linguistic Theory:

Obiri-Yeboah, Michael & Sharon Rose. 2021. Vowel harmony and phonological phrasing in Gua

Abstract
In Gua, an underdocumented Tano Guang language spoken in Ghana, regressive ATR vowel harmony applies within words and non-iteratively across word boundaries. Although vowel harmony is known to cross word boundaries in some languages, little is known about the domains and extent of such harmony. We show that ATR harmony in Gua operates within phonological phrases that preferentially consist of two or three words, with binary phrases at the left edge and ternary phrases at the right edge of the utterance. Syntactic structure can exert an influence, but only with respect to subjects. In addition, we demonstrate that unary phrases are permitted, but not at the edge of the utterance. Gua is the first reported vowel harmony case that shows the same kind of phonological phrasing sensitivity as other prosodic phenomena, such as tone and duration.