Masso, S., McLeod, S., Wang, A. & Baker, E., & McCormack, J. (2017, in press). Longitudinal changes in polysyllable maturity of preschool children with speech sound disorders. Clinical Linguistics and Phonetics.
Here is the abstract:
Children’s polysyllables (words of three or more syllables) were investigated to determine changes in (1) consonant and vowel accuracy, (2) error category frequency, and (3) levels of maturity over time. Participants were 80 children (aged 4;0-5;4) with phonologically-based speech sound disorders who participated in the Sound Start Study and completed the Polysyllable Preschool Test (Baker, 2013) three times. Polysyllable errors were categorised using the Word-level Analysis of Polysyllables (WAP, Masso, 2016a) and the Framework of Polysyllable Maturity (Framework, Masso, 2016b), which represents five maturity levels (Levels A-E). Participants demonstrated a statistically significant increase in polysyllable accuracy across three time points as measured by consonant and vowel accuracy, and frequency of polysyllable errors. Children who demonstrated the lowest level of maturity (Level A) had frequent deletion errors, alterations of phonotactics, and alterations of timing. Participants in Level B were 8.62 times more likely to improve than children in Level A at Time 1. Children who present with frequent deletion errors may be less likely to improve their polysyllable accuracy.
