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Recent models of speech encoding suggest that movement plans for frequently used words are stored and that not all speech output is encoded by a process of segment-by segment assembly. We explore the implications of this view for the management of apraxia of speech (AOS). In a treatment study, the effectiveness of a computer-administered, word-level therapy was examined with ten people with AOS. The results demonstrated that treated words showed significant improvement on both perceptual and acoustic measures. Treatment effects were not due to spontaneous recovery, the motivational effects of computer therapy, or general language stimulation.
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Varley et al. (2005) studied this question.