A retrospective longitudinal analysis of phonetic and phonological cleft palate speech characteristics

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Awarding institution
  • University of Strathclyde
Date of award
  • 2016
Thesis identifier
  • T14315
Person Identifier (Local)
  • 20146604
Qualification Level
Qualification Name
Department, School or Faculty
  • Longitudinal studies of cleft palate speech (CPS) are rare in number. Most studies focus on phonetic characteristics of speakers with repaired cleft palate.Only few include phonological analysis of CPS. This dissertation was a retrospective, longitudinal analysis of the phonetic and phonological characteristics of CPS. This thesis aimed at describing the nature of phonetic and phonological characteristics of speech outcomes in children with repaired cleft palate with or without cleft lip (CP±L). In contrast to previous research, the current study also investigated which type of articulation characteristic is the most dominant in CPS. In addition, changes in speech performance from age 5 to 15, as well as potential covariates which could explain severity of speech impairment were analysed. Video-recordings of Cleft Audit Protocol for Speech - Augmented (CAPS-A) sessions of children with repaired bilateral cleft lip and palate (BCLP) (n=9), unilateral cleft lip and palate (UCLP)(n=19) and cleft palate (CP) (n=14) at the ages of 5, 10 and 15 recorded at the Dental Hospital in Glasgow were used as materials for narrow transcription. Information on Percentage of Consonants Correct (PCC) and prevalence of phonological processes was retrieved by the software Computerised Profiling (CPro) (Long et al., 2003). Results of this study showed that children with repaired CP±L used more phonetic than phonological characteristics of CPS at all ages, and they improved in their speech with maturation. Furthermore, variance analysis indicated that a combination of factors rather than single main factors explain severity in speech impairment. Findings of this study could inform age-appropriate analysis of CPS in research and in everyday practice of speech and language therapy. In addition, results of this study have shown that it would be advisable to include phonological assessment of CP±L children at an early age in regular audit sessions.
Resource Type
Date Created
  • 2016
Former identifier
  • 9912523889502996