CONTRAST SENSITIVITY AND COHERENT MOTION DETECTION MEASURED AT PHOTOPIC LUMINANCE LEVELS IN DYSLEXICS AND CONTROLS

P CORNELISSEN; A RICHARDSON; A MASON; S FOWLER; J STEIN

CONTRAST SENSITIVITY AND COHERENT MOTION DETECTION MEASURED AT PHOTOPIC LUMINANCE LEVELS IN DYSLEXICS AND CONTROLS

P CORNELISSEN, A RICHARDSON, A MASON, S FOWLER, J STEIN

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	1483-1494
Number of pages	12
Journal	Vision Research
Volume	35
Issue number	10
Publication status	Published - 1 May 1995

Cite this

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title = "CONTRAST SENSITIVITY AND COHERENT MOTION DETECTION MEASURED AT PHOTOPIC LUMINANCE LEVELS IN DYSLEXICS AND CONTROLS",

abstract = "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.",

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AU - FOWLER, S

AU - STEIN, J

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AB - 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.

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