Visuomotor tracking abilities of speakers with apraxia of speech or conduction aphasia |
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| Authors: | Robin Donald A Jacks Adam Hageman Carlin Clark Heather M Woodworth George |
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| Affiliation: | aResearch Imaging Center, The University of Texas Health Science Center at San Antonio, MC 7777, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA;bDepartments of Neurology and Radiology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA;cHonor’s College and College of Liberal and Fine Arts, University of Texas, San Antonio, TX, USA;dDepartment of Communication Disorders, The University of Northern Iowa, Cedar Falls, IA, USA;eDepartment of Language, Reading, Exceptionalities, Appalachian State University, Boone, NC, USA;fDepartment of Statistics and Actuarial Science, The University of Iowa, Iowa City, IA, USA |
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| Abstract: | This investigation examined the visuomotor tracking abilities of persons with apraxia of speech (AOS) or conduction aphasia (CA). In addition, tracking performance was correlated with perceptual judgments of speech accuracy. Five individuals with AOS and four with CA served as participants, as well as an equal number of healthy controls matched by age and gender. Participants tracked predictable (sinusoidal) and unpredictable signals using jaw and lip movements transduced with strain gauges. Tracking performance in participants with AOS was poorest for predictable signals, with decreased kinematic measures of cross-correlation and gain ratio and increased target-tracker difference. In contrast, tracking of the unpredictable signal by participants with AOS was performed as well as for other groups (e.g. participants with CA, healthy controls). Performance of the subjects with AOS on the predictable tracking task was found to strongly correlate with perceptual judgments of speech. These findings suggest that motor control capabilities are impaired in AOS, but not in CA. Results suggest that AOS has its basis in motor programming deficits, not impaired motor execution. |
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| Keywords: | Apraxia of speech Conduction aphasia Visuomotor tracking Motor programming Motor speech disorders Speech motor control |
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