Lovrich Deborah, Cheng Jeff, Velting Drew
SUNY Empire State College, Old Westbury, NY 11568, USA.
Child Neuropsychol. 2003 Sep;9(3):159-74. doi: 10.1076/chin.9.3.159.16458.
Event-related potentials (ERPs) were obtained from 15 electrode sites in six average and six impaired reading children, 12 years of age, during visual letter discrimination tasks. Subjects responded to target letters with an enclosed area in the form task and to letters that rhymed with "e" in the rhyme task. Response accuracy was similar between the groups. Reaction time was relatively longer for the impaired group during the rhyme task. At lateral sites, condition differences were evident as greater negative shifts in the rhyme task than the form at 170 and 470 ms as well as a delayed late positivity for the rhyme. In terms of reading ability, the average readers' ERPs were more negative than those of the impaired group at 270 and 450 ms. Inter-hemispheric variations were also seen between the groups, with the average readers more negative than the impaired readers at right hemisphere sites. Contrary to expectations, group differences in the ERP did not vary substantially as a function of condition, and task demands were evaluated in view of these findings.
在视觉字母辨别任务中，从12岁的6名阅读能力正常和6名阅读能力受损的儿童的15个电极位点记录事件相关电位（ERP）。在图形任务中，受试者对带有封闭区域的目标字母做出反应；在押韵任务中，对与“e”押韵的字母做出反应。两组之间的反应准确性相似。在押韵任务中，受损组的反应时间相对较长。在外侧位点，条件差异明显，在170毫秒和470毫秒时，押韵任务比图形任务有更大的负向偏移，并且押韵任务的晚期正波延迟出现。在阅读能力方面，在270毫秒和450毫秒时，阅读能力正常的读者的ERP比受损组的更负。两组之间也存在半球间差异，在右半球位点，阅读能力正常的读者比受损读者更负。与预期相反，ERP中的组间差异并没有随着条件的变化而有很大差异，并根据这些发现对任务要求进行了评估。
