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Fundamental frequency characteristics of speakers with cerebral palsy and dysarthria:
A descriptive study

Katherine C. Hustad, Gary Weismer, & Sarah K. Schellinger

This study sought to describe habitual fundamental frequency characteristics of a group of 10 speakers with cerebral palsy and dysarthria. Speakers produced 10 different 5-word sentences taken from the Sentence Intelligibility Test (Yorkston et al., 1996). In addition, a group of healthy age and gender matched control speakers also produced the target sentences to determine “normal” F0 contours for the stimulus sentences. Measures included mean F0 for each sentence contour, F0 ranges, qualitative description of time-normalized F0 contours, and regression analyses to estimate declination rates and F0 variability. Intelligibility scores were obtained for each speaker with dyarthria from 10 different listeners, for a total of 100 listeners. Additional regression procedures were employed to describe the relation between intelligibility scores and F0 variables. Intra- and inter-speaker differences on F0 measures will be described. Clinical and theoretical implications and F0 measurement challenges and issues will be discussed.

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