Differences Between School-Aged Children with Apraxia of Speech and Other Speech Sound Disorders on Multisyllable Repetition.

Abstract

To evaluate whether features of childhood apraxia of speech identified in previous literature could be replicated in a sample of school-age children. A literature review was conducted to identify candidate speech features that have been previously considered when differentiating childhood apraxia of speech from other types of speech sound disorders. The candidate features recoverable from blinded transcriptions of multisyllable word repetitions (MSWR) were applied to a cohort of 61 children, aged 7-17, previously classified as having childhood apraxia of speech (n=21) or non-CAS Speech Sound Disorder (SSD, n=40). One hundred and ninety-four features had been explored in previous literature to assess their ability to differentiate CAS from other SSDs. Fifteen perceptual features were selected from this list to be applied to performance on the MSWR. In this sample, children with CAS differed from children with SSD on the prevalence of voicing changes, percent of structurally correct words, correct lexical stress, and syllable deletions within a speech corpus derived from the MSWR task. Although previous literature points to numerous features as differentiating CAS from other SSDs, only a portion of those features were replicated in this sample of school-age children. Features of CAS that affect segmental accuracy, prosody and word structure may be likely to persist into late childhood and early adolescence.