Letter reversals in dyslexia originate from a difficulty to discriminate shapes’ orientation
(2022) Groupe de Contact FNRS: Psycholinguistique & Neurolinguistique (GCPN) — Location: Mons (25.November.2022)
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- Abstract
- Although letter reversals errors (e.g., “b” vs. “d”) have been considered a hallmark of dyslexia for decades, there is little evidence supporting this claim. Moreover, the nature of these putative errors remains elusive: are they phonological or visual? specific to letters? to certain types of mirror reflections? We will present preliminary results of an ongoing study on these issues. So far, 22 normo-typical and 21 dyslexic children enrolled in the 6th grade have participated to two experiments. The first was a lexical decision task testing their ability to detect mirror (e.g., “d” for “b”) and phonological (e.g., “g” for “b”) errors. In the second, we measured their ability to - 7 discriminate 2D tilted asymmetrical shapes that differed in terms of either a plane-rotation (control condition) or two types of mirror reflection (one “object-based” and one “scene-based” mirror reflection). The preliminary results invite three conclusions about dyslexic children: (1) they have a disproportionate difficulty to detect mirror errors; (2) they are also in difficulty to discriminate mirror reflection of geometrical shapes; (3) they are equally in difficulty to discriminate shapes differing in terms of plane-rotations. Together, these results point to an across-the-board deficit in the processing of shapes’ orientation in dyslexia.
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Houbben, M., & Vannuscorps, G. (2022). Letter reversals in dyslexia originate from a difficulty to discriminate shapes’ orientation. Groupe de Contact FNRS: Psycholinguistique & Neurolinguistique (GCPN), Mons. https://hdl.handle.net/2078.5/100474