Doctoral Dissertations

Date of Award


Degree Type


Degree Name

Doctor of Philosophy


Speech and Hearing Science

Major Professor

Carl W. Asp

Committee Members

Isa Schwarz, Molly Erickson, Olga Welch


This study compared three pharyngeal swallowing measurements: Pharyngeal Delay Time (PDT), Stage Transition Duration (STD), and Delayed Pharyngeal Swallow (DPS) on the correct classification of three groups of subjects. These groups were: 15 stroke patients who aspirated (aspirators), 15 stroke patients who did not aspirate (non-aspirators) and 15 normal subjects.

Overall, the STD had highest mean classification among the three pharyngeal swallowing measurements. All three measures has a significant difference between aspirators and normal subjects. None of the measurements showed a difference between non-aspirators and normal subjects. The aspirators and the normal subjects were classified correctly most often; whereas the non-aspirators were considerably lower. The aspirators had the longest duration for triggering pharyngeal swallowing, whereas non-aspirators and normal subjects had similar durations. Clinical implications were discussed.

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