Spatio-temporal contrast sensitivity, coherent motion, and visible persistence in developmental dyslexia

Spatio-temporal contrast sensitivity, coherent motion, and visible persistence in developmental... Three experiments measured spatio-temporal contrast sensitivity, coherent motion, and visible persistence in a single group of children with developmental dyslexia and a matched control group. The findings were consistent with a transient channel disorder in the dyslexic group which showed a reduction in contrast sensitivity at low spatial frequencies, a significant reduction in sensitivity for coherent motion, and a significantly longer duration of visible persistence. The results were also examined by classifying the dyslexic group into dyseidetic, dysphonetic, and mixed (dysphoneidetic) subgroups. There were no differences between the control and dyseidetic groups in contrast sensitivity, in coherent motion and in visible persistence. In comparison to the control group, the mixed (dysphoneidetic) dyslexic subgroup was found to have a significant reduction in contrast sensitivity at low spatial frequencies, a significant reduction in sensitivity for coherent motion, and a significantly longer duration of visible persistence. In comparison to the control group, the dysphonetic group only showed a reduction in contrast sensitivity at low spatial frequencies. Comparisons between the dyseidetic, dysphonetic and mixed dyslexic subgroups showed that there were no substantive differences in contrast sensitivity, coherent motion, and visible persistence. The results support the proposal and findings by Borsting et al. (Borsting E, Ridder WH, Dudeck K, Kelley C, Matsui L, Motoyama J. Vis Res 1996;36:1047–1053) that a transient channel disorder may only be present in a dysphoneidetic dyslexic subgroup. Psychometric assessment revealed that all the children with dyslexia appear to have a concurrent disorder in phonological coding, temporal order processing, and short-term memory. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Vision Research Elsevier

Spatio-temporal contrast sensitivity, coherent motion, and visible persistence in developmental dyslexia

Vision Research, Volume 39 (3) – Feb 1, 1999

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Publisher
Elsevier
Copyright
Copyright © 1998 Elsevier Science Ltd
ISSN
0042-6989
eISSN
1878-5646
D.O.I.
10.1016/S0042-6989(98)00151-5
Publisher site
See Article on Publisher Site

Abstract

Three experiments measured spatio-temporal contrast sensitivity, coherent motion, and visible persistence in a single group of children with developmental dyslexia and a matched control group. The findings were consistent with a transient channel disorder in the dyslexic group which showed a reduction in contrast sensitivity at low spatial frequencies, a significant reduction in sensitivity for coherent motion, and a significantly longer duration of visible persistence. The results were also examined by classifying the dyslexic group into dyseidetic, dysphonetic, and mixed (dysphoneidetic) subgroups. There were no differences between the control and dyseidetic groups in contrast sensitivity, in coherent motion and in visible persistence. In comparison to the control group, the mixed (dysphoneidetic) dyslexic subgroup was found to have a significant reduction in contrast sensitivity at low spatial frequencies, a significant reduction in sensitivity for coherent motion, and a significantly longer duration of visible persistence. In comparison to the control group, the dysphonetic group only showed a reduction in contrast sensitivity at low spatial frequencies. Comparisons between the dyseidetic, dysphonetic and mixed dyslexic subgroups showed that there were no substantive differences in contrast sensitivity, coherent motion, and visible persistence. The results support the proposal and findings by Borsting et al. (Borsting E, Ridder WH, Dudeck K, Kelley C, Matsui L, Motoyama J. Vis Res 1996;36:1047–1053) that a transient channel disorder may only be present in a dysphoneidetic dyslexic subgroup. Psychometric assessment revealed that all the children with dyslexia appear to have a concurrent disorder in phonological coding, temporal order processing, and short-term memory.

Journal

Vision ResearchElsevier

Published: Feb 1, 1999

References

  • Developmental dyslexia: a diagnostic approach based on three atypical reading-spelling patterns
    Boder, E
  • Contrast sensitivity and coherent motion detection measured at photopic luminance levels in dyslexics and controls
    Cornellisen, P; Richardson, A; Mason, A; Fowler, S; Stein, J
  • No interaction between the first- and second-order motion pathways
    Edwards, M; Badcock, D.R
  • Effects of a red background on magnocellular functioning in average and specifically disabled readers
    Edwards, V.T; Hogben, J.H; Clark, C.D; Pratt, C
  • Visual and visuomotor performance in dyslexic children
    Felmingham, K.L; Jacobson, L.S
  • X and Y cells in the lateral geniculate nucleus of macaque monkeys
    Kaplan, E; Shapley, R.M
  • Dyslexia and a transient/magnocellular pathway deficit: the current situation and future directions
    Lovegrove, W.J
  • The Neale analysis of reading ability
    Neale, M.D
  • The effect of physical flicker on visible persistence on normal and specifically-disabled readers
    Slaghuis, W.L; Lovegrove, W.J
  • Sequential estimation of points on a psychometric function
    Wetherill, G.B; Levitt, H

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