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https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/120509
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| Title: | Deficits in Processing of Lexical Tones in Mandarin-speaking Children with Developmental Language Disorder: Electrophysiological Evidence |
| Authors: | Cheng, Y.-Y.;Wu, H.-C.;Shih, H.-Y.;Yeh, P.-W.;Yen, H.-L.;Lee, C.-Y. |
| Date: | 2021-03-31 |
| Issue Date: | 2021-04-15 12:14:07 (UTC+8) |
| Abstract: | Purpose
This study explored the neural marker indexing deficits in discriminating lexical tone changes in Mandarin-speaking children with developmental language disorders (DLDs) using mismatch negativity, an event-related potential component for auditory change detection. Mandarin has four lexical tones characterized by a high-level tone (T1), high-rising tone (T2), low-dipping tone (T3), and high-falling tone (T4), in which the T2/T3 contrast is acoustically less discriminable in developmental groups. Therefore, this study further examined how deficits in children with DLD would vary with tonal contrasts' acoustic saliency.
Method
Event-related potentials were measured using the multideviant oddball paradigm described by Lee et al. (2012), who used Mandarin syllables [i] in T3 as the standard sound (80%), T1 as the large deviant (10%), and T2 as the small deviant (10%). Twelve children with DLD aged between 4 and 6 years participated in this study, and 12 age-matched children with typical development were selected from the data set of Lee et al. (2012) as the controls.
Results
The T1/T3 change elicited adultlike mismatch negativity in both the DLD and control groups, while no group difference was revealed. The T2/T3 change elicited a robust positive mismatch response (P-MMR) in children with DLD, while the P-MMR was less significant in the control group. The group comparisons revealed a larger P-MMR in children with DLD than in the control group. Furthermore, children with lower scores in language assessments tend to reveal larger P-MMRs.
Conclusions
This study demonstrated that deficits in children with DLD in discriminating subtle lexical tone changes reflect greater positivity of P-MMR to T2/T3 change. This implies that MMR to T2/T3 may serve as a neural marker for evaluating language delay in preschoolers. |
| Relation: | Journal of Speech, Language, and Hearing Research 64(4), p.1176-1188 |
| DOI: | 10.1044/2021_JSLHR-19-00392 |
| Appears in Collections: | [Department of German] Journal Article
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