Testing the interhemispheric deficit theory of dyslexia using the visual half-field technique
<p>A deficit in interhemispheric transfer has been proposed as a neuropsychological theory of dyslexia. The role of interactions between the hemispheres during word recognition is demonstrated in two behavioural effects robustly reported using the visual half field paradigm. The well-establish...
| Main Authors: | , , |
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| Format: | Journal article |
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SAGE Publications
2019
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| _version_ | 1826292090916569088 |
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| author | Bradshaw, A Bishop, DVM Woodhead, ZVJ |
| author_facet | Bradshaw, A Bishop, DVM Woodhead, ZVJ |
| author_sort | Bradshaw, A |
| collection | OXFORD |
| description | <p>A deficit in interhemispheric transfer has been proposed as a neuropsychological theory of dyslexia. The role of interactions between the hemispheres during word recognition is demonstrated in two behavioural effects robustly reported using the visual half field paradigm. The well-established recognition advantage for right visual field (RVF) words over left visual field (LVF) words reflects the additional processing costs associated with callosal transfer of LVF word representations to the language specialised left hemisphere. Additionally, a further gain in recognition for bilateral presentation of a word is attributed to cooperative interactions between the hemispheres. These recognition advantages can therefore be seen as behavioural indices of the efficiency of callosal transfer. This study aimed to replicate the finding of an absence of the bilateral advantage in developmental dyslexia, previously reported by Henderson, Barca and Ellis (2007). 47 dyslexic and 43 control adult participants were tested, and no significant difference found in the size of their bilateral advantages. Our data did however replicate the previous finding of an increased RVF advantage in right handed dyslexic participants caused by poorer accuracy for LVF words. This evidence provides partial support for the interhemispheric deficit theory of dyslexia, suggesting an impairment in the transfer of visual word information from the right to the left hemisphere during reading.</p> |
| first_indexed | 2024-03-07T03:09:21Z |
| format | Journal article |
| id | oxford-uuid:b3a51b07-3abc-49da-a9f4-fc5cc57d5fae |
| institution | University of Oxford |
| last_indexed | 2024-03-07T03:09:21Z |
| publishDate | 2019 |
| publisher | SAGE Publications |
| record_format | dspace |
| spelling | oxford-uuid:b3a51b07-3abc-49da-a9f4-fc5cc57d5fae2022-03-27T04:20:46ZTesting the interhemispheric deficit theory of dyslexia using the visual half-field techniqueJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b3a51b07-3abc-49da-a9f4-fc5cc57d5faeSymplectic Elements at OxfordSAGE Publications2019Bradshaw, ABishop, DVMWoodhead, ZVJ<p>A deficit in interhemispheric transfer has been proposed as a neuropsychological theory of dyslexia. The role of interactions between the hemispheres during word recognition is demonstrated in two behavioural effects robustly reported using the visual half field paradigm. The well-established recognition advantage for right visual field (RVF) words over left visual field (LVF) words reflects the additional processing costs associated with callosal transfer of LVF word representations to the language specialised left hemisphere. Additionally, a further gain in recognition for bilateral presentation of a word is attributed to cooperative interactions between the hemispheres. These recognition advantages can therefore be seen as behavioural indices of the efficiency of callosal transfer. This study aimed to replicate the finding of an absence of the bilateral advantage in developmental dyslexia, previously reported by Henderson, Barca and Ellis (2007). 47 dyslexic and 43 control adult participants were tested, and no significant difference found in the size of their bilateral advantages. Our data did however replicate the previous finding of an increased RVF advantage in right handed dyslexic participants caused by poorer accuracy for LVF words. This evidence provides partial support for the interhemispheric deficit theory of dyslexia, suggesting an impairment in the transfer of visual word information from the right to the left hemisphere during reading.</p> |
| spellingShingle | Bradshaw, A Bishop, DVM Woodhead, ZVJ Testing the interhemispheric deficit theory of dyslexia using the visual half-field technique |
| title | Testing the interhemispheric deficit theory of dyslexia using the visual half-field technique |
| title_full | Testing the interhemispheric deficit theory of dyslexia using the visual half-field technique |
| title_fullStr | Testing the interhemispheric deficit theory of dyslexia using the visual half-field technique |
| title_full_unstemmed | Testing the interhemispheric deficit theory of dyslexia using the visual half-field technique |
| title_short | Testing the interhemispheric deficit theory of dyslexia using the visual half-field technique |
| title_sort | testing the interhemispheric deficit theory of dyslexia using the visual half field technique |
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