| Summary: | This article seeks to develop alternatives to recent theories (Hayes 1985, 1987, 1991; McCarthy and Prince 1986, 1990; Prince 1991) that explain quantitative asymmetries between iambic and trochaic systems on the basis of a rhythmic iambic-trochaic taw. The theory proposed here derives such asymmetries from two different rhythmic factors: moraic prominence-relations internal to heavy syllables, and avoidance of clash and 1apse in sequences of moras. Firstly, it argues for a distinction between parsing feet and surface feet. Parsing feet draw from a symmetric foot inventory, based on two parameters: stressable element (morn vs. syllable), and headedness (iambic vs. trochaic), That is, the basic foot inventory is no longer governed by the iambic-trochaic law. Secondly, parsing feet are mapped into surface feet by rules that impose quantitative changes, or by stray adjunction, induced by strict prosodic layering. Thirdly, a rhythmic sub-theory defines filters that rule out clashes and lapses in sequences of moras or syllables, depending on the type of stressable element, It explains iambic-trochaic asymmetries with respect to lengthening and shortening, and an asymmetry with respect to directionality of iambic parsing. Evidence will be presented from Tiibatutabal, Yidin y, Araucanian, Chugach Alutiiq Yupik, Cayuga, Latin, and English.
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