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Meta-Analysis of Visual-Spatial Deficits in Dyslexia

机译：诵读困难的视觉空间缺陷的荟萃分析

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A number of studies have investigated visuo-spatial traits in dyslexia, and have reported mixed results. We undertook a systematic search of studies that examined visual-spatial deficits in dyslexia. The analysis involved comparisons of 324 students with dyslexia compared to 304 students without dyslexia from 12 studies. To address whether there was a difference between students with and without dyslexia (controls) on visual learning tasks, effect sizes were pooled and a weighted averaged effect size was computed using a fixed effects model. A significance test for the weighted average effect sizes was computed using an alpha level of .05.The weighted average effect size computed from these studies was found to be.72 (a medium effect size), which was statistically significant. Using a fixed-effects model, the mean effect size of our sample was .717+ .089, with a lower confidence mean effect size of .627 and an upper mean effect size of .806. The magnitude of deficits was, on average, moderate. Evidence for the visual attentional deficit was found to be robust to many variations in study design. The weighted average effect size for M(y)-cell abnormalities, was 1.0 (right eye) and 1.3 (left eye). However, moderate levels of heterogeneity were found between study-level effect sizes, Tau = .38771 (p=.092). These associations are discussed with respect to other findings that have demonstrated the existence of some specific visuo-spatial disorders in dyslexia.
机译：许多研究调查了阅读障碍的视觉空间特征，并报告了不同的结果。我们进行了系统的研究，以检查阅读障碍的视空间缺陷。该分析涉及来自12项研究的324名有阅读障碍的学生与304名没有阅读障碍的学生的比较。为了解决有阅读障碍和没有阅读障碍（对照）的学生在视觉学习任务上是否存在差异，汇总了效果大小，并使用固定效果模型计算了加权平均效果大小。加权平均效应大小的显着性检验使用0.05的alpha值进行计算。这些研究得出的加权平均效应大小为72（中等效应大小），具有统计学意义。使用固定效应模型，我们样本的平均效应量为.717+ .089，较低的置信度平均效应量为.627，较高的平均效应量为.806。赤字的幅度平均而言是中等的。视觉注意缺陷的证据被发现对于研究设计中的许多变化是有力的。 M（y）细胞异常的加权平均效应大小为1.0（右眼）和1.3（左眼）。然而，在研究水平的效应量之间发现中等水平的异质性，Tau = .38771（p = .092）。结合其他发现讨论了这些关联，这些发现已证明阅读障碍中存在某些特定的视觉空间障碍。

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