The little-described language, commonly known as Ingessana, has a vowel system that consists of the [–ATR] vowels [ε, ɔ, a] and the [+ATR] vowels [i, u, ə]. The [ATR] vowel harmony functions in roots and spreads across morpheme boundaries. There are several occurrences of vowel harmony spreading both rightward and leftward, as well as [+ATR] quality as a distinctive feature of one morpheme. The vowel harmony process commonly occurs in both noun and verb morphology, spreading from root to suffix and from suffix to root. The [+ATR] quality is always dominant regardless of the direction of spreading.
©Walter de Gruyter