Model-Driven Treatment of Childhood Apraxia of Speech: Positive Effects of the Speech Motor Learning Approach Purpose The aim of the study was to propose the speech motor learning approach (Van der Merwe, 2011) as a treatment for childhood apraxia of speech and to determine if it will effect positive change in the ability of a 33-month-old child to produce untreated nonwords and words containing treated ... Clinical Focus
Newly Published
Clinical Focus  |   December 08, 2017
Model-Driven Treatment of Childhood Apraxia of Speech: Positive Effects of the Speech Motor Learning Approach
 
Author Affiliations & Notes
  • Anita van der Merwe
    Department of Speech-Language Pathology and Audiology, University of Pretoria, Hatfield, South Africa
  • Mollie Steyn
    Department of Speech-Language Pathology and Audiology, University of Pretoria, Hatfield, South Africa
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Anita van der Merwe: anita.vandermerwe05@gmail.com
  • Editor: Krista Wilkinson
    Editor: Krista Wilkinson×
  • Associate Editor: Rebecca McCauley
    Associate Editor: Rebecca McCauley×
Article Information
Speech, Voice & Prosodic Disorders / Apraxia of Speech & Childhood Apraxia of Speech / Speech, Voice & Prosody / Newly Published / Clinical Focus
Clinical Focus   |   December 08, 2017
Model-Driven Treatment of Childhood Apraxia of Speech: Positive Effects of the Speech Motor Learning Approach
American Journal of Speech-Language Pathology, Newly Published. doi:10.1044/2017_AJSLP-15-0193
History: Received December 11, 2015 , Revised July 15, 2016 , Accepted July 21, 2017
 
American Journal of Speech-Language Pathology, Newly Published. doi:10.1044/2017_AJSLP-15-0193
History: Received December 11, 2015; Revised July 15, 2016; Accepted July 21, 2017

Purpose The aim of the study was to propose the speech motor learning approach (Van der Merwe, 2011) as a treatment for childhood apraxia of speech and to determine if it will effect positive change in the ability of a 33-month-old child to produce untreated nonwords and words containing treated age-appropriate consonants (Set 1 sounds), untreated age-appropriate consonants (Set 2), and untreated age-inappropriate consonants (Set 3) and also to determine the nature and number of segmental speech errors before and after treatment.

Method An A-B design with multiple target measures and follow-up was implemented to assess the effects of treatment of Set 1. Effect sizes for whole-word accuracy were determined, and two criterion lines were generated following the conservative dual criterion method. Speech errors were judged perceptually.

Results Conservative dual criterion analyses indicated no reliable treatment effect due to rising baseline scores. Effect sizes showed significant improvement in whole-word accuracy of untreated nonwords and real words containing age-appropriate treated sounds and real words containing age-appropriate untreated sounds. The number of errors for all three sound sets declined. Sound distortion was the most frequent error type.

Conclusions Preliminary evidence suggests potentially positive treatment effects. However, rising baseline scores limit causal inference. Replication with more children of different ages is necessary.

Supplemental Materials https://doi.org/10.23641/asha.5596708

Acknowledgments
Financial assistance of the National Research Foundation of South Africa toward the master's studies of Mollie Steyn is acknowledged. Opinions expressed and conclusions presented are not to be attributed to the National Research Foundation. The authors wish to thank the participant, his parents, and his speech-language pathologist and to express appreciation to Dr. Diane Kendall for her assistance during transcription and processing of the data.
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