Portland State University. Dept. of Speech Communication
Stephen A. Kosokoff
Term of Graduation
Date of Publication
Master of Science (M.S.) in Speech Communication
Speech, Intelligibility of -- Testing, Articulation disorders in children -- Diagnosis
1 online resource (v, 54 pages)
Intelligibility is the most fundamental factor for successful speech communication. Measurements of speech intelligibility carry important clinical consequences that relate to description of severity, need for intervention, intervention goals, service delivery options, and treatment efficacy. It is important, therefore, that speech-language pathologists use an approach that reflects an accurate and valid measure of intelligibility. The purpose of this study was to investigate the relationship between the two seemingly most common procedures used by practicing speech-language pathologists for measuring speech intelligibility: the gross estimation of intelligibility procedure, and the orthographic transcription procedure. Twelve 100-word connected speech samples were analyzed by 4 trained listeners to determine percentage of speech intelligibility, first by gross estimation, and secondly, by orthographic transcription.
Both procedures resulted in a score that yields a percentage of intelligibility. Results from this study indicate that mean Pearson-L correlation coefficients for interjudge reliability were strong at .87 and .88, for the gross estimation procedure and orthographic transcription procedure, respectively. Intrajudge reliability using a discrepancy model indicated that 3 of the 4 listeners were relatively consistent in their gross estimation ratings. A high correlation between the gross estimation and the orthographic transcription procedures in determining percent of intelligibility was indicated by the Pearson-L correlation coefficient of .85. Visual inspection of the data, however, indicated that the listeners were, in fact, not consistently in agreement in percentages assigned by the two procedures for individual speakers.
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Clarke, Heather Gail, "Gross Estimation: A Study of the Clinical Validity for Measuring Intelligibility" (1997). Dissertations and Theses. Paper 5685.