This article introduces a new way to explain how information structure is signaled prosodically in English. I claim that METRICAL STRUCTURE plays a central role (Ladd 2008, Truckenbrodt 1995. Information structure (defined as in Steedman 1991 andVallduví &Vilkuna 1998) places strong constraints on the PROBABIILISTIC mapping of words onto metrical prosodic structure-that is, foci usually align with nuclear accents and theme/rheme units with prosodic phrases, and themes are less metrically prominent than rhemes. It is shown that focus position, scope, and pragmatic interpretation are then derived by manipulating EXPECTED PROMINENCE within metrical structure. Broadly, the more prominent a word than expected, the more likely a contrastive reading; the less prominent, the more likely a givenness reading. Both constructed and naturally occurring examples from the Switchboard corpus are used.*
1.INTRODUCTION. If information structure describes the salience and organization of information in an utterance in relation to a discourse, then in English, prosodic prominence and phrasing are intuitively central to conveying it. Within the extensive body of literature trying to formalize this relationship, however, there is still disagreement about what information structure is, and how it is signaled prosodically in English. I wish to make two claims here about how it is signaled. First, information structure is signaled through the alignment of words with metrical prosodic structure, so METRICAL STRUCTURE is central. Second, the mapping of words onto metrical structure is PROBABILISTIC, with information structure, prosodic structure itself, and other linguistic and contextual factors placing constraints on this mapping. These claims refute the assumption in much of the literature that information structure is signaled by the distribution of PITCH ACCENTS, and that information-structure interpretation is determined DIRECTLY from prosodic cues. This article shows that the relationship between information structure and prosody can be explained much more effectively and comprehensively using a metrical approach from a probabilistic perspective. We see that, from this perspective, both information structure and prosodic structure are richer than many accounts imply. In particular, many aspects of information-structure interpretation can be fruitfully explained in terms of the manipulation of expected prominence given probabilistic constraints.The literature on information structure, and how it is signaled prosodically, is vast, with much contradictory use of terminology for the same underlying phenomena (e.g. see Kruijff-Korbayová & Steedman 2003). This article therefore begins by establishing the key underlying concepts and terminology in the view presented here. I start with a description of metrical prosodic structure and the main constraints it places on word-metrical structure alignment, and describe how discourse properties are conveyed given a metrical approach, drawing on recent proposals in the same vein (Truckenbrodt 1999...