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Development dyslexics perform differently from controls on a number of low level visual tasks. We carried out three experiments to explore some of these differences. Dyslexics have been found to have reduced luminance contrast sensitivity at mesopic luminance levels. We failed to replicate this finding at photopic luminance levels. We also compared the (photopic) coherent motion detection thresholds of groups of child and adult dyslexics with those of age matched controls. Dyslexics were significantly less sensitive to motion. The results are discussed in relation to a recent suggestion that developmental dyslexia may be associated with a magnocellular visual deficit.

Original publication

DOI

10.1016/0042-6989(95)98728-r

Type

Journal article

Journal

Vision Res

Publication Date

05/1995

Volume

35

Pages

1483 - 1494

Keywords

Adolescent, Adult, Age Factors, Child, Contrast Sensitivity, Dyslexia, Female, Humans, Male, Motion Perception, Sensory Thresholds, Visual Pathways