Sentence Intelligibility as a Function of Key Word Selection

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Abstract
The purpose of this study was to investigate the relationship between word predictability and sentence intelligibility. This relationship was examined by comparing intelligibility scores obtained with frequency-filtered sentences (CID Sentence Lists B and D and Revised List C) which were scored using key words empirically determined to be representative of three different degrees of predictability. We hypothesized that the scores obtained would be a function of the predictability status of the key words used in scoring. Results indicated significant differences between the three scoring procedures for each sentence list under two filtering conditions (420-Hz and 360-Hz low pass) and these differences were in the hypothesized direction. The results suggest that use of “easy-to-predict” words for scoring purposes will increase sentence intelligibility scores, while use of “difficult-to-predict” words will depress scores. We concluded that word predictability is a factor influencing sentence intelligibility and that careful selection of key words, based on their predictability status, is a method of controlling or influencing the intelligibility of sentences.

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