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Use of the Hermann grid illusion in the measurement of contrast perception in dyslexia

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Gilchrist, JM, Pierscionek, BK and Mann, WM (2005) Use of the Hermann grid illusion in the measurement of contrast perception in dyslexia. VISION RESEARCH, 45 (1). pp. 1-8. [Journal article]

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DOI: 10.1016/j.visres.2004.08.020


We measured contrast thresholds for perception of the Hermann grid illusion, using different contrast polarities and mean luminances, in dyslexics and non-dyslexics. Both groups of subjects gave significantly lower thresholds with grids having dark squares and light paths, but there was no significant threshold difference between groups. Perceived strength of illusion was also measured in grids at suprathreshold contrast levels. Dyslexics perceived the illusion to be significantly stronger than non-dyslexics when the grid had light paths and low luminance. (c) 2004 Elsevier Ltd. All rights reserved.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Biomedical Sciences
Research Institutes and Groups:Biomedical Sciences Research Institute
Biomedical Sciences Research Institute > Vision
ID Code:7631
Deposited By:Professor Barbara Pierscionek
Deposited On:18 Jan 2010 09:55
Last Modified:18 Jan 2010 09:55

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