Department of Psychology, University of Illinois, Urbana-Champaign, Illinois 61820, USA.
Psychophysiology. 2010 Jul 1;47(4):774-85. doi: 10.1111/j.1469-8986.2009.00969.x. Epub 2010 Jan 29.
Associative processing in the cerebral hemispheres was examined using ERPs and visual half-field (VF) methods. Associative strength was manipulated using asymmetrically associated pairs: viewed in one order (forward), there was a strong prime-to-target association, but in the backward order, predictability was weak. N400 priming was greater for forward than backward pairs in both VFs and not different across VF, suggesting similar semantic representations and automatic meaning activation in the two hemispheres. However, a frontal P2 enhancement for forward pairs restricted to the LH suggests that it uses context to predict likely upcoming words. Also, greater late positive complex priming for backward pairs in the LH than the RH reveals a LH advantage for strategically reshaping meaning activation for weakly related and/or non-canonically ordered pairs. The results link asymmetries in word processing with those observed at the sentence level.
采用事件相关电位（ERP）和视觉半视野（VF）方法研究大脑半球的联想加工。使用不对称联想对来操纵联想强度：以一种顺序（正向）呈现时，存在强烈的启动-目标关联，但以相反的顺序呈现时，可预测性较弱。在两个 VF 中，正向联想对的 N400 启动作用大于反向联想对，并且在 VF 之间没有差异，这表明两个半球具有相似的语义表示和自动意义激活。然而，仅在左半球（LH）中，正向联想对的额前 P2 增强表明它使用上下文来预测可能出现的单词。此外，在 LH 中，与 RH 相比，反向联想对的晚期正性复合启动更大，这表明 LH 具有优势，可以战略性地重塑弱相关和/或非规范顺序对的意义激活。研究结果将单词处理中的不对称性与在句子层面观察到的不对称性联系起来。
