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Computational Linguistics

Hwee Tou Ng, Editor
December 2001, Vol. 27, No. 4, Pages 579-587
(doi: 10.1162/089120101753342680)
© 2001 Association for Computational Linguistics
A Reformulation of Rule 2 of Centering Theory
Article PDF (155.31 KB)

The standard preference ordering on the well-known centering transitions Continue, Retain, Shift is argued to be unmotivated: a partial, context-dependent ordering emerges from the interaction between principles dubbed cohesion (maintaining the same center of attention) and salience (realizing the center of attention as the most prominent NP). A new formulation of Rule 2 of centering theory is proposed that incorporates these principles as well as a streamlined version of Strube and Hahn's (1999) notion of cheapness. It is argued that this formulation provides a natural way to handle “topic switches” that appear to violate the canonical preference ordering.