Moro voicelessness dissimilation and binary [voice] *

This paper reports on a heretofore undescribed pattern of voicelessness dissimilation in the Kordofanian language Moro. Voiceless obstruents become voiced when preceding another voiceless obstruent in a transvocalic (≈CVC) configuration. This pattern is robust and productive across multiple morphological contexts. The phonetic facts of voicing in Moro show it to be a difference between prevoiced and short lag VOT. This points to [voice] as the most realistic featural characterization of the voicing contrast; the pattern cannot be explained as dissimilation of another feature like [spread glottis]. The voiceless dissimilation pattern is strong evidence that [voice] is binary– and that [-voice] may be phonologically active, despite being ‘unmarked’. We show that when reference to [-voice] is allowed, the Moro pattern can be straightforwardly analyzed as [-voice] dissimilation. Our formal analysis uses the theory of SURFACE CORRESPONDENCE, which carries no assumptions about markedness as a prerequisite for dissimilation. An online appendix compares the proposed analysis to alternatives based on other approaches to dissimilation.

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