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| | SECTION 3: CLINICAL ASPECTS OF AAC DEVICES |
 | | These speech (dysarthria, apraxia) and language (aphasia) impairments are associated with a variety of neurologic conditions, the most common including amyotrophic lateral sclerosis (also known as ALS or Lou Gehrigs Disease), cerebral palsy, locked-in-syndrome, multiple sclerosis, Parkinson disease, brain-stem stroke, cortical stroke, progressive aphasia, and traumatic brain injury. |
 | | Dysarthria is a collective term used to describe a group of speech disorders caused by disturbances in muscular control resulting from damage to the central and/or peripheral nervous system (Darley, Aronson, and Brown, 1975; Duffy, 1995; McNeil, 1997; Yorkston, Beukelman, Strand, and Bell, 1999). |
 | | The prevalence of dysarthria in the United States must be extrapolated from demographic data detailing the incidence of neuromuscular diseases associated with dysarthria, such as cerebral palsy, Parkinson disease, amyotrophic lateral sclerosis (ALS), traumatic brain injury, brain-stem stroke, and later stages of multiple sclerosis, because dysarthria often is a symptom of these diseases/conditions. |
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