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KMID : 1036820190240010101
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Communication Sciences & Disorders
2019 Volume.24 No. 1 p.101 ~ p.116
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Effects of Vocal Rehearsal and Auditory Input Enhancement on Delayed Nonword Repetition Performance in Children with and without Speech Sound Disorders
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Kim Mi-Jin
Ha Ji-Wan
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Abstract
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Objectives: The purpose of this study was to investigate the effects of two memory strategies, vocal rehearsal and auditory input enhancement, on phonological memory tasks in children with and without speech sound disorders.
Methods: Eighteen children with speech sound disorders (pure SSD group), 8 children with speech sound disorders and comorbid language disorders (SSD+LD group), and 19 typically developing peers (TD group) aged 3 to 5 years old participated in this study. They performed delayed nonword repetition tasks according to vocal rehearsal, auditory input enhancement, and rehearsal inhibition. The nonword repetition scores, the percentage of error types, and the variability of vocal rehearsal were compared among the three groups.
Results: In rehearsal inhibition, there was no significant difference among groups. However, the performances of the pure SSD group and the TD group improved in the vocal rehearsal and auditory input enhancement conditions, showing a significant difference from the SSD+LD group. As a result of the error analysis, the SSD+LD group showed significantly more ‘no response’ errors than the other groups, whereas the TD group showed significantly more ‘phoneme substitution’ errors than the other groups. The SSD+LD group showed significantly more variability in the vocal rehearsals than the other groups.
Conclusion: Both vocal rehearsal and auditory input enhancement are effective for phonological memory enhancement; but auditory input enhancement, a less burdensome task for children, is more effective. The pure SSD group can expect phonological memory improvement using these two strategies matching that of the TD group; however this approach has a limited effect on the SSD+LD group, so they need different strategies.
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KEYWORD
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Speech sound disorder, Delayed nonword repetition, Phonological working memory, Vocal rehearsal, Auditory input enhancement
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