Pronouns, Names, and the Centering of Attention in Discourse

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Abstract
Centering theory, developed within computational linguistics, provides an account of ways in which patterns of interutterance reference con promote the local coherence of discourse. It states that each utterance in a coherent discourse segment contains a single semantic entity—the backward-looking center—that provides a link to the previous utterance, and an ordered set of entities—the forward-looking centers—that offer potential links to the next utterance. We report five reading-time experiments that test predictions of this theory with respect to the conditions under which it is preferable to realize (refer to) on entity using a pronoun rather thon o repeated definite description or name. The experiments show that there is a single backward-looking center that is preferentially realized as a pronoun, and that the backward-looking center is typically realized as the grammatical subject of the utterance. They also provide evidence that there is a set of forward-looking centers that is ranked in terms of prominence, and that a key factor in determining prominence—surface-initial position—does not affect determination of the backward-looking center. This provides evidence for the dissociation of the coherence processes of looking backward and looking forward.

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