Neutral Vowels in Optimality Theory: A Comparison of Yoruba and Wolof

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Abstract
Patterns of vowel harmony are frequently interrupted by the presence of neutral segments, segments that are obligatorily realised with only one of the harmonic values. Peripherally, neutral segments appear in two patterns, referred to as relative and absolute alignment. Medially, such neutral segments may beopaque, interrupting the transmission of harmony, or they may betransparent, skipped over by harmony. It is argued that the properties of neutrality result from the interaction of three independently motivated families of constraints: faithfulness, alignment, and grounding. No process-specific constraints distinguishing between the types of alignment or between opacity and transparency are required under the proposed account.

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