The information conveyed by words in sentences.
A method is presented for calculating the amount of information conveyed to a hearer by a speaker emitting a sentence generated by a probabilistic grammar known to both parties. The method applies the work of Grenander (1967) to the intermediate states of a top-down parser. This allows the uncertainty about structural ambiguity to be calculated at each point in a sentence. Subtracting these values at successive points gives the information conveyed by a word in a sentence. Word-by-word information conveyed is calculated for several small probabilistic grammars, and it is suggested that the number of bits conveyed per word is a determinant of reading times and other measures of cognitive load.
Hale
John
J
Department of Cognitive Science, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA. hale@cogsci.jhu.edu
D006801:Humans; D008960:Models, Psychological; D011578:Psycholinguistics; D014825:Vocabulary