Sotho Phonology - Tonology

Tonology

Sesotho is a tonal language spoken using two contrasting tones: low and high; further investigation reveals, however, that in reality it is only the high tones that are explicitly specified on the syllables in the speaker's mental lexicon, and that low tones appear when a syllable is tonally under-specified. Unlike the tonal systems of languages such as Mandarin, where each syllable basically has an immutable tone, the tonal systems of the Niger–Congo languages are much more complex in that several "tonal rules" are used to manipulate the underlying high tones before the words may be spoken, and this includes special rules ("melodies") which, like grammatical or syntax rules that operate on words and morphemes, may change the tones of specific words depending on the meaning one wishes to convey.