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Five measures of speech and linguistic ability were used to evaluate differences between athetoids and spastics matched on CA and IQ. The measures used were Integrated Articulation Test, speech articulation ratings, Abstraction Test, Sound Discrimination Test, and the Peabody Picture Vocabulary Test. The spastic children were superior to athetoid children on ratings of speech intelligibility and ability in articulation. The differences between the two groups on the sound discrimination, abstraction and vocabulary tests were nonsignificant, thus no significant differences were found between subclasses in auditory decoding as measured.