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- W2156891796 abstract "The magnocellular theory is a prominent, albeit controversial view asserting that many reading disabled (RD) individuals suffer from a specific impairment within the visual magnocellular pathway. In order to assess the validity of this theory we tested its two basic predictions. The first is that a subpopulation of RD subjects will show impaired performance across a broad range of psychophysical tasks relying on magnocellular functions. The second is that this subpopulation will not be consistently impaired across tasks that do not rely on magnocellular functions. We defined a behavioural criterion for magnocellular function, which incorporates performance in flicker detection, detection of drifting gratings (at low spatial frequencies), speed discrimination and detection of coherent dot motion. We found that some RD subjects (six out of 30) had impaired magnocellular function. Nevertheless, these RD subjects were also consistently impaired on a broad range of other perceptual tasks. The performance of the other subgroup of RD subjects on magnocellular tasks did not differ from that of controls. However, they did show impaired performance in both visual and auditory non-magnocellular tasks requiring fine frequency discriminations. The stimuli used in these tasks were neither modulated in time nor briefly presented. We conclude that some RD subjects have generally impaired perceptual skills. Many RD subjects have more specific perceptual deficits; however, the magnocellular level of description did not capture the nature of the perceptual difficulties in any of the RD individuals assessed by us." @default.
- W2156891796 created "2016-06-24" @default.
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- W2156891796 date "2002-10-01" @default.
- W2156891796 modified "2023-10-16" @default.
- W2156891796 title "Disabled readers suffer from visual and auditory impairments but not from a specific magnocellular deficit" @default.
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- W2156891796 doi "https://doi.org/10.1093/brain/awf231" @default.
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