Some Factors In The Intelligibility Of Cleft-Palate Speech

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Abstract
48 cleft palate patients between the ages of 17 and 59 recorded on tape one of 12 lists of words, phrases and short sentences in such a way as to include the 23 major consonant sounds in proportions comparable to the appearance of these sounds in conversation. In addition, each subject also recorded a short prose passage. As articulation errors increased, intelligibility decreased. Consonant articulation errors are correlated closely with nasality ratings. Nasality ratings depend to a large extent upon the intelligibility scores. The importance of velarpharyngeal closure as a first step in therapy may have been over-emphasized.

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