CAS is a very specific disorder with a very specific profile and is therefore different from “typical” speech sound disorders. The CAS hypothesis in ASD (the CAS-ASD hypothesis) is that “CAS contributes to the inappropriate speech, prosody, and/or voice characteristics reported in some children and adults with verbal ASD” (Shriberg et al. , 2011, p. 405). For this to be true, the speech, prosody, and voice findings in children with ASD must not only be unusual or disordered, but they must also fit the particular profile of CAS.McCleery et al. (2006) studied the speech sound development of minimally verbal and nonverbal children with ASD and compared their development to that of typically developing children matched for speech production and comprehension skills. Their findings indicate that children with ASD, even those with severe language delay, show the same general patterns of consonant production as typically developing children. Furthermore, the production model of children with ASD is practically identical for sounds produced spontaneously and for sounds produced by imitation.....
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