Infixation is characterized by the intrusion of one morphological element
inside of another. Since infixes are positioned relative to a phonological
“pivot” (e.g., Yu 2007), and since infixes can
combine with complex (multimorphemic) stems, it stands to reason that an
infix can sometimes, incidentally, appear at a
morpheme juncture; and indeed, this is attested. In this
talk, I ask: When an infix (incidentally) appears between two morphemes in
its stem, does the infix disrupt relations at/across that morpheme juncture
that we otherwise expect to be strictly local? I investigate the
(non-)transparency of 9 infixes (from 8 languages; 7 language families)
that can appear at a morpheme juncture. I find that these infixes disrupt
limited types of phonological interactions in their stems, but never
interrupt semantic, syntactic, or morphological interactions/relationships
in their stems. These findings provide novel evidence for a post-syntactic
model of morphology, where exponent choice proceeds from the bottom up,
interleaved with some (but not all) phonological processes.