Silva-Pereyra J, Fernández T, Harmony T, Bernal J, Galán L, Díaz-Comas L, Fernández-Bouzas A, Yáñez G, Rivera-Gaxiola M, Rodríguez M, Marosi E
Centro de Neurobiología, Campus UNAM-UAQ Juriquilla, APDO, Postal 1-1141, Universidad Nacional Autónoma de México., Qro. 76001, Querétaro, Mexico.
Int J Psychophysiol. 2001 Feb;40(1):17-32. doi: 10.1016/s0167-8760(00)00123-9.
The P300 ERP component was studied in poor and normal readers, using Sternberg and color discrimination (Spaceships) tasks. During the first one, subjects must decide if a probe item belongs or not to a set of digits previously presented. In the second one, the participants must shoot violet spaceships with one key and other than violet spaceships with another key. There were no significant differences between groups with respect to reaction times, but a larger proportion of errors was observed in poor readers. Longer P300 latencies were recorded for poor readers than controls in both tasks. P300 amplitudes showed topographical differences between the two groups: Poor readers' P300 is larger frontally during the Sternberg task, but smaller at posterior sites during the Spaceships task. These results suggest that poor readers may have deficiencies during the early processing stage, such as visual stimulus evaluation. Poor readers also appear to have deficits for classifying and memorizing visual stimuli.
使用斯特恩伯格任务和颜色辨别（太空船）任务，对阅读能力差的读者和正常读者的P300事件相关电位成分进行了研究。在第一个任务中，受试者必须判断一个探测项目是否属于先前呈现的一组数字。在第二个任务中，参与者必须用一个按键射击紫色太空船，用另一个按键射击非紫色太空船。两组在反应时间方面没有显著差异，但在阅读能力差的读者中观察到更大比例的错误。在两项任务中，阅读能力差的读者的P300潜伏期都比对照组更长。P300波幅在两组之间显示出地形差异：在斯特恩伯格任务期间，阅读能力差的读者的P300在额叶部位更大，但在太空船任务期间，在后部部位更小。这些结果表明，阅读能力差的读者在早期处理阶段可能存在缺陷，如视觉刺激评估。阅读能力差的读者在对视觉刺激进行分类和记忆方面似乎也存在缺陷。
