Trigger poverty and reduplicative identity in Lakota

This paper offers a phonological account of various ways in which reduplication interacts with independent processes in Lakota: transparent application in the case of cluster simplification, overapplication in the case of palatalization, and underapplication in the case of vowel mutation. I argue that all three patterns follow from phonological optimization rather than morpheme-specific constraints on the reduplicant or on other morphemes, and that the co-existence of divergent patterns is compatible with such a phonological analysis. Local application is the default pattern, while overapplication receives a cyclic explanation. For underapplication, which is the most recalcitrant pattern in Lakota, I offer an account in terms of Trigger Poverty, a concept which denotes an imbalance between the number of triggers and the number of potential targets created by copying. Trigger Poverty is likely to be a more general abstract source of underapplication beyond Lakota. This paper thus contributes to the discussion of modularity in phonology by presenting evidence that identity effects in reduplication can be epiphenomenal.