Childhood Apraxia of Speech
"Childhood apraxia of speech (CAS) is a neurological childhood (pediatric) speech sound disorder in which the precision and consistency of movements underlying speech are impaired in the absence of neuromuscular deficits (e.g., abnormal reflexes, abnormal tone). CAS may occur as a result of known neurological impairment, in association with complex neurobehavioral disorders of known or unknown origin, or as an idiopathic neurogenic speech sound disorder. The core impairment in planning and/or programming spatiotemporal parameters of movement sequences results in errors in speech sound production and prosody."
— American Speech-Language-Hearing Association (ASHA) Ad Hoc Committee on Apraxia of Speech in Children (2007)
The cause of childhood apraxia of speech (CAS), also known as developmental verbal dyspraxia (DVD), is unknown. Research on the brain structures has not been able to find specific areas indicating lesions or differences in brain structure. Some observations suggest a genetic relationship with CAS, as many with the disorder have a family history of communication disorders.
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