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Syllables without consonantal onsets may be invisible for stress-assignment, reduplication, or tone. Many authors attribute this behavior to some sort of prosodic deficiency, while having little to say about cases in which onsetless syllables act as well-formed constituents. In the Onset Prominence (OP) representational environment, the ambiguous behavior of onsetless syllables is explained by means of a single representational parameter. Prosodically active initial vowels are assumed to be specified for the Vocalic Onset (VO) layer of structure, a specification lacking in prosodically inert onsetless syllables. Diverse phonological implications of VO specification for KiKerewe, Eastern Arrernte, Tashlhiyt Berber and Polish are examined. In the case of Polish, phonetic data on the glottalization of initial vowels provide additional support for the representational proposal. Finally, the place of the OP environment within the context of modern phonological theory is discussed.

This paper provides an account of how certain instances of "headedness" in segmental phonology may be derived within the Onset Prominence (OP) representational framework. It is shown that headedness is not a primitive property of OP representation, but rather emerges directly from the phonetic anatomy of the OP representational primitives, envisioned in terms of Traunmüller's Modulation Theory. The phonological status of voicing, including the relationship between nasals and voiced stops has been ascribed to headedness. Here it is shown to fall out from the Modulation perspective on laryngeal phonology. With regard to vowel quality, it is shown that apparent headedness effects derive from asymmetries in the modulatory properties of formant convergences as opposed to individual formants. Empirical implications of this perspective are reflected in vowel harmony patterns, by which rounding is typically less likely to be harmonic than palatality or tongue root advancement.

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This paper presents an acoustic phonetic study of Polish V#V sequences designed to shed light on the phonological representation of glottal marking. Independent phonological evidence from Polish suggests that initial vowels contain an "empty onset" that may be realized as glottal marking. The results of the experiment suggest that glottal marking in Polish is quite robust, and may be realized by increases in spectral balance. In the Onset Prominence environment, the "empty onset" is derived from phonetic principles, realized as specification for the Vocalic Onset layer of structure. VO parameter settings capture important ambiguities in speech perception and allow for a unified analysis of glottal marking, distributional restrictions on Polish vowels, and ambiguities underlying palatalization processes.