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Speech Disorder: How Dysarthria Causes

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ASHA defines dysarthria as “A neurological motor speech disorder affecting the strength, range of motion, speed, and precision of the speech musculature” (ASHA, 2017). There are several congenital and acquired causes for this disorder including: traumatic brain injury, tumors, degenerative diseases, strokes, toxic and metabolic conditions. The damage causes paralysis, weakness, or lack of coordination of the the muscles involved in articulating speech, which results in reduced intelligibility. Dysarthria affects the respiration, phonation, resonance, prosody, and articulation of speech. Spastic dysarthria; results from a lesion in the upper motor neurons and causes spasticity of the muscles. A lesion in on the lower motor neurons resulting

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