Taylor M J, Keenan N K
Division of Neurology, Hospital for Sick Children, University of Toronto, Canada.
Psychophysiology. 1990 May;27(3):318-27. doi: 10.1111/j.1469-8986.1990.tb00389.x.
Event-related potentials (ERPs) were recorded in 31 normal and 21 dyslexic children, the latter with visual processing impairment, in three visual reading-related tasks: a nonalphabetic, an alphabetic, and a lexical decision task (two levels of difficulty in each). ERPs were recorded from fifteen active electrodes for 1.5 s following stimulus presentation; analyses were done on difference waves. N2 and P3 components were usually longer in latency and P3 was lower in amplitude in the dyslexic than in the normal children. The P3 had a flatter, broader distribution in the dyslexics than in the controls, which was very similar to the effect of difficulty in the two easier tasks. The lack of Group X Age interactions is inconsistent with either a maturational lag between the groups of children, or with the dyslexic children catching up to normals in terms of their speed of processing. Thus, the dyslexic children required more time to process the visual information across tasks (with only their letter classification being equal to that of the normal controls) and approved to have a different developmental pattern in their ERPs from that of the normal children.
对31名正常儿童和21名阅读障碍儿童进行了事件相关电位（ERP）记录，后者存在视觉处理障碍。在三项与视觉阅读相关的任务中进行记录：一项非字母任务、一项字母任务和一项词汇判断任务（每项任务有两个难度级别）。刺激呈现后，从15个活动电极记录1.5秒的ERP；对差异波进行分析。与正常儿童相比，阅读障碍儿童的N2和P3成分潜伏期通常更长，P3波幅更低。阅读障碍儿童的P3分布比对照组更平坦、更广泛，这与两项较简单任务中难度增加的影响非常相似。缺乏组×年龄的交互作用，这与两组儿童之间的成熟滞后不一致，也与阅读障碍儿童在处理速度方面赶上正常儿童的情况不一致。因此，阅读障碍儿童在各项任务中处理视觉信息需要更多时间（只有他们的字母分类与正常对照组相当），并且其ERP的发育模式与正常儿童不同。
