Kevan Alison, Pammer Kristen
The Australian National University, School of Psychology, Canberra ACT 0200, Australia.
Vision Res. 2008 Dec;48(28):2835-9. doi: 10.1016/j.visres.2008.09.022. Epub 2008 Oct 30.
Visual processing deficits in dyslexic readers are argued to evolve as a consequence of reading failure. This study examines dorsal stream functioning of children before they commence formal reading instruction to determine whether visual deficits precede reading difficulties. Coherent motion and visual frequency doubling detection were measured in children at familial risk for dyslexia and in children unselected for family reading history. Here we show that children who are at family risk for dyslexia demonstrate dorsal stream deficits before they learn to read, whilst demonstrating no corresponding deficits in coherent form and static grating control tasks. Results indicate that the dorsal visual deficits observed in dyslexic readers are unlikely to be the result of reading failure.
阅读障碍读者的视觉处理缺陷被认为是阅读失败的结果。本研究考察了儿童在开始正式阅读教学之前的背侧流功能，以确定视觉缺陷是否先于阅读困难出现。对有诵读困难家族风险的儿童和未根据家族阅读史挑选的儿童进行了连贯运动和视觉频率加倍检测。我们发现，有诵读困难家族风险的儿童在学习阅读之前就表现出背侧流缺陷，而在连贯形式和静态光栅控制任务中没有相应的缺陷。结果表明，阅读障碍读者中观察到的背侧视觉缺陷不太可能是阅读失败的结果。
