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Poor neural and perceptual phoneme discrimination during acoustic variation in dyslexia
Whereas natural acoustic variation in speech does not compromise phoneme discrimination in healthy adults, it was hypothesized to be a challenge for developmental dyslexics. We investigated dyslexics’ neural and perceptual discrimination of native language phonemes during acoustic variation. Dyslexi...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7250843/ https://www.ncbi.nlm.nih.gov/pubmed/32457322 http://dx.doi.org/10.1038/s41598-020-65490-3 |
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author | Virtala, P. Talola, S. Partanen, E. Kujala, T. |
author_facet | Virtala, P. Talola, S. Partanen, E. Kujala, T. |
author_sort | Virtala, P. |
collection | PubMed |
description | Whereas natural acoustic variation in speech does not compromise phoneme discrimination in healthy adults, it was hypothesized to be a challenge for developmental dyslexics. We investigated dyslexics’ neural and perceptual discrimination of native language phonemes during acoustic variation. Dyslexics and non-dyslexics heard /æ/ and /i/ phonemes in a context with f(o) variation and then in a context without it. Mismatch negativity (MMN) and P3a responses to phoneme changes were recorded with electroencephalogram to compare groups during ignore and attentive listening. Perceptual phoneme discrimination in the variable context was evaluated with hit-ratios and reaction times. MMN/N2bs were diminished in dyslexics in the variable context. Hit-ratios were smaller in dyslexics than controls. MMNs did not differ between groups in the context without variation. These results suggest that even distinctive vowels are challenging to discriminate for dyslexics when the context resembles natural variability of speech. This most likely reflects poor categorical perception of phonemes in dyslexics. Difficulties to detect linguistically relevant invariant information during acoustic variation in speech may contribute to dyslexics’ deficits in forming native language phoneme representations during infancy. Future studies should acknowledge that simple experimental paradigms with repetitive stimuli can be insensitive to dyslexics’ speech processing deficits. |
format | Online Article Text |
id | pubmed-7250843 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-72508432020-06-04 Poor neural and perceptual phoneme discrimination during acoustic variation in dyslexia Virtala, P. Talola, S. Partanen, E. Kujala, T. Sci Rep Article Whereas natural acoustic variation in speech does not compromise phoneme discrimination in healthy adults, it was hypothesized to be a challenge for developmental dyslexics. We investigated dyslexics’ neural and perceptual discrimination of native language phonemes during acoustic variation. Dyslexics and non-dyslexics heard /æ/ and /i/ phonemes in a context with f(o) variation and then in a context without it. Mismatch negativity (MMN) and P3a responses to phoneme changes were recorded with electroencephalogram to compare groups during ignore and attentive listening. Perceptual phoneme discrimination in the variable context was evaluated with hit-ratios and reaction times. MMN/N2bs were diminished in dyslexics in the variable context. Hit-ratios were smaller in dyslexics than controls. MMNs did not differ between groups in the context without variation. These results suggest that even distinctive vowels are challenging to discriminate for dyslexics when the context resembles natural variability of speech. This most likely reflects poor categorical perception of phonemes in dyslexics. Difficulties to detect linguistically relevant invariant information during acoustic variation in speech may contribute to dyslexics’ deficits in forming native language phoneme representations during infancy. Future studies should acknowledge that simple experimental paradigms with repetitive stimuli can be insensitive to dyslexics’ speech processing deficits. Nature Publishing Group UK 2020-05-26 /pmc/articles/PMC7250843/ /pubmed/32457322 http://dx.doi.org/10.1038/s41598-020-65490-3 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Virtala, P. Talola, S. Partanen, E. Kujala, T. Poor neural and perceptual phoneme discrimination during acoustic variation in dyslexia |
title | Poor neural and perceptual phoneme discrimination during acoustic variation in dyslexia |
title_full | Poor neural and perceptual phoneme discrimination during acoustic variation in dyslexia |
title_fullStr | Poor neural and perceptual phoneme discrimination during acoustic variation in dyslexia |
title_full_unstemmed | Poor neural and perceptual phoneme discrimination during acoustic variation in dyslexia |
title_short | Poor neural and perceptual phoneme discrimination during acoustic variation in dyslexia |
title_sort | poor neural and perceptual phoneme discrimination during acoustic variation in dyslexia |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7250843/ https://www.ncbi.nlm.nih.gov/pubmed/32457322 http://dx.doi.org/10.1038/s41598-020-65490-3 |
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