The effect of contrast on reading speed in dyslexia.
The effect of contrast on reading speed in dyslexia.
复制标题
对比度对阅读障碍患者阅读速度的影响。
DOI：
10.1016/s0042-6989(00)00041-9
复制
发表时间：
2000
期刊：
影响因子：
1.8
通讯作者：
Legge,GE
中科院分区：
文献类型：
--
作者：
O'Brien,BA;Mansfield,JS;Legge,GE
据报道，对比度编码在阅读障碍者和正常阅读者之间存在差异。阅读障碍者需要更高水平的对比度来检测特定时空条件下的正弦波光栅，而阅读障碍者在低对比度下显示出更快的视觉搜索。我们通过测量诵读困难儿童和成人以及年龄匹配的对照组的阅读速度与文本对比度的函数关系，研究了早期对比编码中的这些差异是否可以推广到阅读表现。对比度对阅读障碍者和正常者阅读成绩的影响相似。对于两组，在100和2%对比度之间，阅读速度相对恒定，在2%对比度以下迅速下降。这种结果模式适用于儿童和成人，适用于有或没有句子上下文的文本，适用于各种字符大小的文本，适用于阅读和阅读的文本。我们的结论是，早期的研究结果，在光栅检测或视觉搜索任务的对比度影响组的差异不推广到阅读。
Contrast coding has been reported to differ between dyslexic and normal readers. Dyslexic readers require higher levels of contrast to detect sinewave gratings for certain spatiotemporal conditions, and dyslexic readers show faster visual search at low contrast. We investigated whether these differences in early contrast coding generalize to reading performance by measuring reading speed as a function of text contrast for dyslexic children and adults and for age-matched controls. Contrast affected reading performance of dyslexic and normal readers similarly. For both groups, reading speed was relatively constant between 100 and 2% contrast, and decreased rapidly below 2% contrast. This pattern of results held true for both children and adults, for text with and without sentence context, across a range of character sizes, and for reading aloud and reading silently. We conclude that earlier findings of group differences in contrast effects on grating detection or visual search tasks do not generalize to reading.