title: Influence of continual biofeedback on jaw pursuit-tracking in healthy adults and in adults with apraxia plus aphasia.
abstract: Apraxia of speech (AOS) is a disorder of motor programming resulting from damage to premotor or anterior insula cortex. The authors used a pursuit visuomotor tracking task to test whether such a disorder interferes with development of motor programs or with modification of existing programs via integration of feedback. Healthy older adults (n = 15) and adults with AOS plus aphasia and nonverbal apraxia (n = 8) performed a jaw movement task with (a) continuous visual feedback of a target movement pattern and their jaw movement and (b) no feedback. Healthy speakers were more accurate and less variable with feedback, suggesting accurate development of a program and feedback integration. Apraxic individuals' performance accuracy and response to feedback suggested that the neurological damage impairs both development of new programs and efficient integration of feedback.
authors.affiliation: Department of Speech Pathology & Audiology, University of Iowa, Iowa City, IA, USA. kirrie-ballard@uiowa.edu
authors.forename: K J
authors.initials: KJ
authors.lastname: Ballard
authors.forename: D A
authors.initials: DA
authors.lastname: Robin
mesh_terms: D000328:Adult; D000368:Aged; D001037:Aphasia / Q000150:complications / Q000503:physiopathology*; D001072:Apraxias / Q000150:complications / Q000503:physiopathology*; D001245:Association Learning / Q000502:physiology; D001676:Biofeedback, Psychology / Q000502:physiology*; D005260:Female; D006801:Humans; D007568:Jaw / Q000502:physiology*; D008297:Male; D016555:Matched-Pair Analysis; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D009069:Movement Disorders / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology; D011597:Psychomotor Performance / Q000502:physiology; D012016:Reference Values; D013064:Speech Disorders / Q000209:etiology / Q000503:physiopathology; D014705:Verbal Behavior / Q000502:physiology