An electrophysiological investigation of orthographic spatial integration in reading.
An electrophysiological investigation of orthographic spatial integration in reading.
复制标题
阅读中的正交空间整合的电生理学研究。
DOI：
10.1016/j.neuropsychologia.2019.04.009
复制
发表时间：
2019
期刊：
影响因子：
2.6
通讯作者：
Grainger,Jonathan
中科院分区：
文献类型：
--
作者：
Snell,Joshua;Meade,Gabriela;Meeter,Martijn;Holcomb,Phillip;Grainger,Jonathan
在阅读过程中，单词识别速度受到与周围单词的拼写重叠程度的影响。这种现象的本质尚不清楚：一些理论将其归因于低水平的视觉操作(即，影响中心凹字母检测器的旁中央凹特征检测器)，而另一些理论则假设正字法加工(即字母位置编码和单词激活)并行地发生在多个单词上。为了在这些理论之间进行仲裁，我们使用脑电图法揭示了词汇判断任务中正字法空间整合的时间进程。中心凹目标词在两侧各有旁凹词，分别在三种情况下进行操作：重复侧翼(如岩石岩石)、无关侧翼(阶梯岩步)和无侧翼条件。建立了线性混合效应模型，以逐个试验的基础上分析脑电数据。在不相关侧翼条件下，单词再认比在重复和无侧翼条件下更差。这种行为模式伴随着N250和N400窗口中负性的增加，分别与亚词汇和词汇语义表征的激活有关。重要的是，在刺激后200 毫秒之前没有效应提供了证据，反对低水平视觉过程的参与。我们的结论是，正字法空间整合是由多个单词的并行加工驱动的，这导致了更大的子词汇节点集的激活，当这些单词在正字法上不相关时，在词汇水平上的加工更加困难。
During reading, word recognition speed is influenced by the amount of orthographic overlap with surrounding words. The nature of this phenomenon is not understood: some theories attribute it to low-level visual operations (i.e., parafoveal feature detectors influencing foveal letter detectors), whereas other theories assume that orthographic processing (i.e., letter position coding and word activation) occurs across multiple words in parallel. To arbitrate between these theories, we used electroencephalography to reveal the time course of orthographic spatial integration in a lexical decision task. Foveal target words were flanked on each side by parafoveal words, manipulated across three conditions: repetition flankers (e.g.rock rock rock), unrelated flankers (step rock step) and a no-flanker condition. Linear mixed-effect models were constructed to analyze EEG data on a trial-by-trial basis. Word recognition was worse in the unrelated flanker condition than in the repetition and no-flanker conditions. This behavioral pattern was accompanied by increased negativity in the N250 and N400 windows, associated with the activation of sub-lexical and lexico-semantic representations, respectively. Crucially, the absence of effects prior to 200 ms post-stimulus onset provides evidence against the involvement of low-level visual processes. We conclude that orthographic spatial integration is driven by parallel processing of multiple words, which leads to the activation of a larger set of sub-lexical nodes and more difficult processing at the lexical level when those words are orthographically unrelated.