Speech Normalization in Developmental Phonological Disorders

Abstract
A two-factor theory is proposed to explain individual differences in intervention outcomes for children with speech delays. Indices of Capability include linguistic measures of a child's comprehension and production phonology and risk factors. Indices of Focus include clinical responses to children's motivation for speech change and level of effort. Retrospective data from clinical records of 75 children who received intervention services in a phonology clinic provide a preliminary test of the proposed two-factor theory. Discriminant function analyses suggest that correlates of Focus are sensitive to factors associated with failure to make progress during intervention. Implications of these findings for prospective predictive research are discussed.

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