Atypical viewing position effect in developmental dyslexia: A behavioural and modelling investigation.
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| Title: | Atypical viewing position effect in developmental dyslexia: A behavioural and modelling investigation. |
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| Authors: | Valdois, Sylviane (AUTHOR), Phénix, Thierry (AUTHOR), Fort, Mathilde (AUTHOR), Diard, Julien (AUTHOR) |
| Source: | Cognitive Neuropsychology. Jul2021, Vol. 38 Issue 5, p319-335. 17p. |
| Subjects: | Dyslexia, Word recognition, Visual fields, Attention span, People with dyslexia |
| Abstract: | The probability of recognizing a word depends on the position of fixation during processing. In typical readers, the resulting word-recognition curves are asymmetrical, showing a left-of-centre optimal viewing position (OVP). First, we report behavioural results from dyslexic participants who show atypical word-recognition curves characterized by the OVP being right of centre with recognition probability being higher on the rightmost than on the leftmost letters. Second, we used BRAID, a Bayesian model of word recognition that implements gaze position, an acuity gradient, lateral interference and a visual attention component, to examine how variations in the deployment of visual attention would affect the OVP curves. We show that the atypical dyslexic curves are well simulated assuming a narrow distribution of visual attention and a shifting of visual attention towards the left visual field. These behavioural and modelling findings are discussed in light of current theories of visual attention deficits in developmental dyslexia. [ABSTRACT FROM AUTHOR] |
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| Database: | Psychology and Behavioral Sciences Collection |
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| Abstract: | The probability of recognizing a word depends on the position of fixation during processing. In typical readers, the resulting word-recognition curves are asymmetrical, showing a left-of-centre optimal viewing position (OVP). First, we report behavioural results from dyslexic participants who show atypical word-recognition curves characterized by the OVP being right of centre with recognition probability being higher on the rightmost than on the leftmost letters. Second, we used BRAID, a Bayesian model of word recognition that implements gaze position, an acuity gradient, lateral interference and a visual attention component, to examine how variations in the deployment of visual attention would affect the OVP curves. We show that the atypical dyslexic curves are well simulated assuming a narrow distribution of visual attention and a shifting of visual attention towards the left visual field. These behavioural and modelling findings are discussed in light of current theories of visual attention deficits in developmental dyslexia. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 02643294 |
| DOI: | 10.1080/02643294.2021.2004107 |
