Visual search deficits are independent of magnocellular deficits in dyslexia |
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| Authors: | Craig M Wright Elizabeth G Conlon Murray Dyck |
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| Institution: | (1) Behavioural Basis of Health Research Group, Griffith Health Institute, Griffith University, Gold Coast, QLD, Australia;(2) Understanding Minds, Mermaid Beach, QLD, Australia |
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| Abstract: | The aim of this study was to investigate the theory that visual magnocellular deficits seen in groups with dyslexia are linked
to reading via the mechanisms of visual attention. Visual attention was measured with a serial search task and magnocellular
function with a coherent motion task. A large group of children with dyslexia (n = 70) had slower serial search times than a control group of typical readers. However, the effect size was small (η
p2 = 0.05) indicating considerable overlap between the groups. When the dyslexia sample was split into those with or without
a magnocellular deficit, there was no difference in visual search reaction time between either group and controls. The data
suggest that magnocellular sensitivity and visual spatial attention weaknesses are independent of one another. They also provide
more evidence of heterogeneity in response to psychophysical tasks in groups with dyslexia. Alternative explanations for poor
performance on visual attention tasks are proposed along with avenues for future research. |
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