Contrast sensitivity and coherent motion detection measured at photopic luminance levels in dyslexics and controls

Developmental 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 fi...

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Bibliographic Details
Published in:Vision research (Oxford) 1995-05, Vol.35 (10), p.1483-1494
Main Authors: Cornelissen, Piers, Richardson, Alex, Mason, Alexandra, Fowler, Sue, Stein, John
Format: Article
Language:English
Subjects:
Adolescent
Adult
Age Factors
Biological and medical sciences
Child
Child clinical studies
Coherent motion
Contrast sensitivity
Contrast Sensitivity - physiology
Dyslexia
Dyslexia - physiopathology
Dyslexia - psychology
Female
Humans
Language and communication disorders
Magnocellular
Male
Medical sciences
Motion Perception - physiology
Photopic
Psychology. Psychoanalysis. Psychiatry
Psychopathology. Psychiatry
Sensory Thresholds - physiology
Visual Pathways - physiopathology
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Summary:Developmental 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.
ISSN:0042-6989
1878-5646
DOI:10.1016/0042-6989(95)98728-R