The spatial distribution of visual attention in developmental dyslexia

Andrea Facoetti, Pierluigi Paganoni, Maria Luisa Lorusso

Research output: Contribution to journalArticlepeer-review

Abstract

The present study investigated the spatial distribution of visual attention in dyslexic and normally reading children. The performances of the two groups were investigated using two different paradigms. In experiment 1 we analyzed the distribution of processing resources both inside and outside the focus of visual attention by simply recording reaction times to the detection of a white dot target projected at different eccentricities from the fovea. The distribution of attentional resources differed significantly between the two groups of children. The eccentricity of the stimulus was significant only for normally reading children - who showed a normal gradient - as it influenced their detection speed, whereas it had no effect on dyslexic children, who exhibited a diffused distribution of visual processing resources inside the visual field. In experiment 2 we studied the distributed (unfocused) mode of attention in a visual search task by measuring reaction times to a target stimulus inside a large configuration with a variable number of distractors. Results show that as compared to normal children dyslexics are better able to distribute their attentional resources diffusely. Our conclusion is that reading disability may be characterized by a diffused distribution of visual processing resources. These data might be interpreted in the framework of studies on magnocellular deficits in dyslexia, whereby the anomalous distribution of visual attention might explain how transient pathway functioning influences the reading process.

Original languageEnglish
Pages (from-to)531-538
Number of pages8
JournalExperimental Brain Research
Volume132
Issue number4
Publication statusPublished - 2000

Keywords

  • Dyslexia
  • Focusing
  • Reaction time
  • Spatial attention
  • Visual search

ASJC Scopus subject areas

  • Neuroscience(all)

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