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KMID : 0921420120170020187
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Korean Journal of Communication Disorders
2012 Volume.17 No. 2 p.187 ~ p.200
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Phonetic Accuracy on a Delayed Picture-Naming Task in Children with a Phonological Disorder
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Yim Dong-Sun
Benjamin Munson
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Abstract
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Background & Objectives : The purposes of this experiment were: (a) to determine whether children with phonological disorder (PD) differ from children with typical language development (TD) in the time-course of lexical access and (b) to explore the factors associated with picture-naming accuracy by children with PD.
Methods: Thirty-eight children consistingof 19 with PD and 19 with TD participated in this study. The children completed experimental tasks including a delayed naming task in which children were presented with pictures that they were instructed to name after a 0 ㎳, 500 ㎳, or 1,000 ㎳ delay interval. Responses atthe 0 ㎳ delay intervalwere presumed to reflect the combined influence of lexical access and post-access processes. Responses at the longer-delay intervals were presumed to primarily reflect post-access processes.
Results: Children with PD produced a higher proportion of phonological errors at all three delay intervals. However, there was not a significant difference in the shorter delay intervals in children with PD. Based on the results of stepwise regression analyses, it was determined that the vocabulary size did not predict any additional variance in naming accuracy. Only the production accuracy of phonemes comprising the nonwords predicted error rates.
Discussion & Conclusion: The findings of this study suggest that children with PD have the same lexical access as children with TD. In other words, the group differences in error rates appeared to be entirely attributable to children’s difficulty producing the phonemes in the pictures’ names. The results discuss the potential underlying reasons for PD including weak phonological representations.
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KEYWORD
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phonological disorder, lexical access, picture naming, speech-production accuracy
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