Dysarthria is a group of motor speech disorders resulting from disturbed muscular control of the speech mechanism due to the damage of the peripheral or central nervous system causing weakness, incoordination, or paralysis of speech musculature. Physiologic characteristics include abnormal or disturbed strength, speed, range, steadiness, tone, and accuracy of muscle movements. The underlying problem is one that affects all movements of the affected muscles. Therefore, disorders of feeding and swallowing often co-occur with the speech disorder. Dysarthria can cause significantly reduced speech intelligibility due to disturbed pitch, loudness, voice quality, resonance, respiratory support for speech, prosody, and articulation.
References and Readings
- Duffy, J. R. (2013). Motor speech disorders: Substrates, differential diagnosis, and management (3rd ed.). St. Louis: Elsevier Mosby.Google Scholar
- Freed, D. (2000). Motor speech disorders: Diagnosis and treatment. San Diego: Singular Publishing.Google Scholar
- Hedge, M. N. (1996). Pocket guide to assessment in speech-language pathology. San Diego: Singular Publishing.Google Scholar
- Kent, R. D. (1997). The speech sciences. San Diego: Singular Publishing.Google Scholar
- Kuehn, D. P., Lemme, M. L., & Baumgartner, J. M. (1989). Neural bases of speech, hearing, and language. Boston: College-Hill.Google Scholar
- Yorkston, K., Beukelman, D., Strand, E. A., & Hakel, M. (2010). Management of motor speech disorders in children and adults (3rd ed.). Austin: Pro-Ed.Google Scholar