Electrophysiological Indices of Discrimination of Long-Duration, Phonetically Similar Vowels in Children With Typical and Atypical Language Development
| Autor: | Mara L. Morr, Diane Kurtzberg, Valerie L. Shafer, Richard G. Schwartz, Hia Datta |
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| Rok vydání: | 2010 |
| Předmět: |
Male
Linguistics and Language medicine.medical_specialty Time Factors Speech perception Mismatch negativity Neuropsychological Tests Audiology Specific language impairment Language and Linguistics Speech and Hearing Discrimination Psychological Phonetics Vowel medicine Humans Attention Language Development Disorders Child Evoked Potentials Language Tests Scalp Brain Contrast (statistics) Electroencephalography Linguistics medicine.disease Language development Electrophysiology medicine.anatomical_structure Case-Control Studies Speech Perception Female Psychology |
| Zdroj: | Journal of Speech, Language, and Hearing Research. 53:757-777 |
| ISSN: | 1558-9102 1092-4388 |
| Popis: | Purpose The authors investigated the neurophysiological bases of vowel perception in children with specific language impairment (SLI) compared with typical language development (TLD) controls using 250-ms phonetically similar vowels. In a previous study, children with SLI showed a poor neurophysiological response (the mismatch negativity [MMN]) to 50-ms versions of these vowels, regardless of whether attention was directed to (attend) or away (passive) from the auditory modality (V. Shafer, M. Morr, H. Datta, D. Kurtzberg, & R. Schwartz, 2005). They hypothesized that longer vowels would allow for improved speech perception. Method Brain responses were elicited to the vowel contrast in 2 conditions: (a) attend and (b) passive. Behavioral discrimination and identification responses were also examined. Results Both SLI and TLD groups showed evidence of discrimination (MMN) of the vowels in the attend and passive conditions. Only subtle differences in the scalp topography of a late negative (LN) brain component were observed between groups. The SLI compared with the TLD group showed significantly poorer identification of these long vowels, as found previously with the shorter vowels. Conclusions Increased vowel duration can improve discrimination in children with SLI. However, poor identification of these longer vowels by some children with SLI suggests a deficit in long-term phonological representations or accessing these representations. |
| Databáze: | OpenAIRE |
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