Perceptual and motor skills
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Randomized Controlled Trial Clinical Trial
Scotopic sensitivity/Irlen syndrome and the use of coloured filters: a long-term placebo-controlled study of reading strategies using analysis of miscue.
This study investigated the long-term effects of using coloured filters on the frequency and type of errors in oral reading. A double-masked, placebo-controlled crossover experimental design was used, with subjects being assessed over a period of 20 months. ⋯ There was a significant improvement for all groups in the accuracy of miscues over the period, although experimental groups over-all did not improve at a significantly different rate than the control group. The failure to find significantly greater improvement for the experimental groups over the control group for the total period, despite subjects' reports of improved print clarity, may be partly related to the lack of effective letter-sound analysis and synthesis skills and to the use of a word-identification strategy of guessing based on partial visual analysis.
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The Children's Embedded Figures Test, the Rod and Frame Test to measure the field dependence-independence cognitive style, Cattell's Culture Fair Intelligence Tests to measure cognitive ability, and two cancellation tasks (Zazzo task and Bourdon task) to assess sustained attention were administered to 179 boys and 110 girls whose average age was 9.0 yr. Correlations between scores on measures of field dependence-independence and cognitive ability were moderated. Average correlations between scores on measures of field dependence-independence, cognitive ability, and measures of sustained attention was .23 for the Zazzo task and quite weak (.06) for the Bourdon task.