Speech refers to the production of speech sounds in a way that conveys meaning in a socially shared system of language. Disordered speech, therefore, is the impairment of either the motor production of sounds or the use of the sounds themselves in meaningful contrasts. Respectively, these disorders are typically called articulation disorders or disorders of the phonological system.

This entry includes information regarding both articulation and phonological disorders in a variety of diagnoses and conditions. Disorders of articulation include not only the developmental delays or disorders commonly heard in typically developing children's speech, but also the disorders that are neurologically or structurally based as well. It is not uncommon, for example, for children with cerebral palsy or with cleft lips or palates to exhibit articulation disorders. ...

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