What is it about?

This was our first study to address the controversy about whether speech consistency helps diagnose apraxia of speech after stroke. We compared aphasia with apraxia of speech to aphasia with phonemic paraphasia. 32 people participated. We formed the comparison groups based on quantitative measures rather than clinical impression. The speech task was to say the same word five times in a row. Our team measured error consistency for all the syllables.

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Why is it important?

The diagnostic recommendations at the time said that people with apraxia of speech produce more consistent speech errors than people with aphasia + phonemic paraphasia. Our results did not support this. We concluded that more research was needed and that diagnostic recommendations may need to be revised.


We learned quickly that measuring error consistency is not easy. There are many ways to define consistency and some measures need better definitions than what had been published in earlier studies.

Katarina L Haley
University of North Carolina at Chapel Hill

Read the Original

This page is a summary of: Error Variability and the Differentiation Between Apraxia of Speech and Aphasia With Phonemic Paraphasia, Journal of Speech Language and Hearing Research, June 2013, American Speech-Language-Hearing Association (ASHA),
DOI: 10.1044/1092-4388(2012/12-0161).
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