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Theories about Developmental Dyslexia
Despite proving its usefulness for over a century, the concept of developmental dyslexia (DD) is currently in severe disarray because of the recent introduction of the phonological theory of its causation. Since mastering the phonological principle is essential for all reading, failure to do so cann...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2023
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9954267/ https://www.ncbi.nlm.nih.gov/pubmed/36831750 http://dx.doi.org/10.3390/brainsci13020208 |
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author | Stein, John |
author_facet | Stein, John |
author_sort | Stein, John |
collection | PubMed |
description | Despite proving its usefulness for over a century, the concept of developmental dyslexia (DD) is currently in severe disarray because of the recent introduction of the phonological theory of its causation. Since mastering the phonological principle is essential for all reading, failure to do so cannot be used to distinguish DD from the many other causes of such failure. To overcome this problem, many new psychological, signal detection, and neurological theories have been introduced recently. All these new theories converge on the idea that DD is fundamentally caused by impaired signalling of the timing of the visual and auditory cues that are essential for reading. These are provided by large ‘magnocellular’ neurones which respond rapidly to sensory transients. The evidence for this conclusion is overwhelming. Especially convincing are intervention studies that have shown that improving magnocellular function improves dyslexic children’s reading, together with cohort studies that have demonstrated that the magnocellular timing deficit is present in infants who later become dyslexic, long before they begin learning to read. The converse of the magnocellular deficit in dyslexics may be that they gain parvocellular abundance. This may often impart the exceptional ‘holistic’ talents that have been ascribed to them and that society needs to nurture. |
format | Online Article Text |
id | pubmed-9954267 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-99542672023-02-25 Theories about Developmental Dyslexia Stein, John Brain Sci Review Despite proving its usefulness for over a century, the concept of developmental dyslexia (DD) is currently in severe disarray because of the recent introduction of the phonological theory of its causation. Since mastering the phonological principle is essential for all reading, failure to do so cannot be used to distinguish DD from the many other causes of such failure. To overcome this problem, many new psychological, signal detection, and neurological theories have been introduced recently. All these new theories converge on the idea that DD is fundamentally caused by impaired signalling of the timing of the visual and auditory cues that are essential for reading. These are provided by large ‘magnocellular’ neurones which respond rapidly to sensory transients. The evidence for this conclusion is overwhelming. Especially convincing are intervention studies that have shown that improving magnocellular function improves dyslexic children’s reading, together with cohort studies that have demonstrated that the magnocellular timing deficit is present in infants who later become dyslexic, long before they begin learning to read. The converse of the magnocellular deficit in dyslexics may be that they gain parvocellular abundance. This may often impart the exceptional ‘holistic’ talents that have been ascribed to them and that society needs to nurture. MDPI 2023-01-26 /pmc/articles/PMC9954267/ /pubmed/36831750 http://dx.doi.org/10.3390/brainsci13020208 Text en © 2023 by the author. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Review Stein, John Theories about Developmental Dyslexia |
title | Theories about Developmental Dyslexia |
title_full | Theories about Developmental Dyslexia |
title_fullStr | Theories about Developmental Dyslexia |
title_full_unstemmed | Theories about Developmental Dyslexia |
title_short | Theories about Developmental Dyslexia |
title_sort | theories about developmental dyslexia |
topic | Review |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9954267/ https://www.ncbi.nlm.nih.gov/pubmed/36831750 http://dx.doi.org/10.3390/brainsci13020208 |
work_keys_str_mv | AT steinjohn theoriesaboutdevelopmentaldyslexia |