An often discussed dimension of the locality conditions on allomorphy is visibility: when do the trigger and target of allomorphy ‘see’ each other? An equally important dimension is intervention: when do the trigger and target stop seeing each other? Through the lens of a detailed analysis of Greek verbal morphology, this paper examines the conditions under which intervention forces the insertion of a default exponent. On the basis of two case studies on affixal allomorphy and one on stem allomorphy, I argue that patterns of intervention are easily accommodated under adjacency-based theories of the locality of allomorphy, and mysterious under less restrictive alternatives.

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