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Abstract
Intelligibility is considered the most important measure of speech disorder and increasing intelligibility is considered as the primary goal of therapeutic intervention.
There is a current interest in determining more specifically the features (perceptual, acoustic, and/or physiological) that contribute to intelligible speech. Perceptual features include; segmental and suprasegmental levels of speech in addition to voice quality.
Traditionally, studies of speech intelligibility have focused on the contribution of segmental articulation to speech intelligibility. Recently, some attention has been given to investigating the contributions of phonation to speech intelligibility. Three important contributions of phonation to speech intelligibility have been outlined: as a source of sound, as a contributor to prosody, and as a contributor to segmental articulation.
Determination of features contributing to reduced intelligibility offers important theoretical benefits by allowing the refinement of models of speech intelligibility. In addition, it offers clinical benefit by allowing the selection of intervention targets most likely to result in significant increases in intelligibility.