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Effects of a Red Background on Magnocellular Functioning in Average and Specifically Disabled Readers


Edwards, VT and Hogben, JH and Clark, CD and Pratt, C, Effects of a Red Background on Magnocellular Functioning in Average and Specifically Disabled Readers, Vision Research, 36, (7) pp. 1037-1045. ISSN 0042-6989 (1996) [Refereed Article]

DOI: doi:10.1016/0042-6989(95)00193-X


Two experiments were conducted using metacontrast masking to examine responses in the magno system of adults, average reading adolescents and adolescents with specific reading disability. In Experiment 1 the effects of a red background field on the metacontrast functions of adult subjects were investigated. Results showed that a red, compared to a photometrically matched white background field, significantly attenuated metacontrast magnitude, supporting the interpretation of metacontrast as due to magno system suppression of parvo system responses. The finding of a red background effect was replicated in Experiment 2 with the two adolescent groups. The metacontrast functions of the adolescent groups also differed significantly, with those with specific reading disability exhibiting weaker metacontrast than the average readers. This result is consistent with a deficit in the magno system of individuals with specific reading disability and indicates the continuation of the deficit beyond childhood.

Item Details

Item Type:Refereed Article
Research Division:Psychology
Research Group:Applied and developmental psychology
Research Field:Educational psychology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in human society
UTAS Author:Pratt, C (Professor Pratt)
ID Code:7109
Year Published:1996
Web of Science® Times Cited:41
Deposited By:Psychology
Deposited On:1996-08-01
Last Modified:2011-08-16

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