Volume 30, Issue 4 p. 643-672
Free Access

Uncertainty About the Rest of the Sentence

John Hale

Corresponding Author

John Hale

Department of Linguistics and Germanic, Slavic, Asian and African Languages, Michigan State University

Department of Linguistics and Germanic, Slavic, Asian and African Languages, Michigan State University, East Lansing, MI 48824-1027Search for more papers by this author

Abstract

A word-by-word human sentence processing complexity metric is presented. This metric formalizes the intuition that comprehenders have more trouble on words contributing larger amounts of information about the syntactic structure of the sentence as a whole. The formalization is in terms of the conditional entropy of grammatical continuations, given the words that have been heard so far. To calculate the predictions of this metric, Wilson and Carroll's (1954) original entropy reduction idea is extended to infinite languages. This is demonstrated with a mildly context-sensitive language that includes relative clauses formed on a variety of grammatical relations across the Accessibility Hierarchy of Keenan and Comrie (1977). Predictions are derived that correlate significantly with repetition accuracy results obtained in a sentence-memory experiment (Keenan & Hawkins, 1987).

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