Phonemic Variability in Apraxia of Speech

No AccessJournal of Speech and Hearing ResearchResearch Article1 Sep 1970Phonemic Variability in Apraxia of Speech Donnell F. Johns, and Frederic L. Darley Donnell F. Johns Florida State University, Tallahassee, Florida Google Scholar and Frederic L. Darley Mayo Clinic, Rochester, Minnesota Google Scholar https://doi.org/10.1044/jshr.1303.556 SectionsAboutPDF ToolsAdd to favoritesDownload CitationTrack Citations ShareFacebookTwitterLinked In Articulatory performance in the condition apraxia of speech (variously designated aphemia, Broca's aphasia, motor aphasia, and cortical dysarthria) was analyzed in 10 patients and compared with the performance of 10 dysarthric and 10 normal subjects. Testing ruled out perceptual impairment and muscular weakness or incoordination as the cause of articulatory errors of the apraxic group. Initial consonant production in speech apraxia is characterized by a high degree of inconsistency of articulation errors; predominance of substitution, repetition, and addition errors as opposed to distortion errors of dysarthria; marked prosodic disturbance without phonatory and resonatory changes; increase of difficulty from spontaneous to oral reading to imitative speech conditions; facilitation of correct articulation by visual monitoring in the auditory-visual stimulus mode in contrast to the auditory (repeating tape-recorded stimuli) or visual (reading words) modes; deterioration of articulation with increase in length of word; and improvement when the patient is allowed to make several consecutive attempts to produce a desired response. Such aberrations in programming of articulatory movements in volitional speech in the absence of significant impairment of language comprehension and muscular weakness fit well within the generic term apraxia. 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