1. Dyslexics exhibit an orthographic, not a phonological deficit in lexical decision.
- Author
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Luke, Steven G., Brown, Toni, Smith, Cole, Gutierrez, Adriana, Tolley, Celeste, and Ford, Olivia
- Subjects
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STATISTICAL models , *RESEARCH funding , *PHONOLOGICAL awareness , *DYSLEXIA , *DECISION making , *ATTENTION , *SPEECH evaluation , *CASE-control method , *PHONETICS , *REACTION time , *COMPARATIVE studies , *INTELLIGENCE tests - Abstract
Dyslexia is theorised to be caused by phonological deficits, visuo-attentional deficits, or some combination of the two. The present study contrasted phonological and visuo-attentional theories of dyslexia using a lexical decision task administered to adult participants with and without dyslexia. Homophone and pseudo-homophone stimuli were included to explore whether the two groups differed in their reliance on phonological encoding. Transposed-letter stimuli, including both TL neighbours and TL non-words, measured potential orthographic impairment predicted by visuo-attentional deficit theories. The findings revealed no significant difference in response time or accuracy between the groups for the homophone and pseudo-homophone stimuli. However, dyslexics were significantly slower and less accurate in their responses to the TL stimuli than controls. Thus, dyslexics presented deficits consistent with visuo-attentional theories, but not with the phonological deficit theory. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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