Effects of a red background on magnocellular functioning in average and specifically disabled readers

Effects of a red background on magnocellular functioning in average and specifically disabled... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Vision Research Elsevier

Effects of a red background on magnocellular functioning in average and specifically disabled readers

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Publisher
Elsevier
Copyright
Copyright © 1996 Elsevier Science Ltd. All rights reserved
ISSN
0042-6989
eISSN
1878-5646
D.O.I.
10.1016/0042-6989(95)00193-X
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Vision ResearchElsevier

Published: Apr 1, 1996

References

  • Functional classes of cells and their laminar distribution in monkey visual cortex
    Dow, B.M.
  • Identification, classification and anatomical segregation of cells with X-like and Y-like properties in the lateral geniculate nucleus of old-world primates
    Dreher, B.; Fukada, Y.; Rodieck, R.W.
  • A comparison of temporal integration in children with a specific reading disability and normal readers
    Hogben, J.H.; Rodino, I.S.; Clark, C.D.; Pratt, C.
  • Psychophysical evidence for sustained and transient detectors in human vision
    Kulikowski, J.J.; Tolhurst, D.J.
  • Reading disability: Normative or pathological
    Prior, M.R.
  • Visual sensitivity and parallel retinocortical channels
    Shapley, R.
  • Spatial and chromatic interactions in the lateral geniculate body of the rhesus monkey
    Wiesel, T.N.; Hubel, D.H.

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