Salmon Nirit, Pratt Hillel
Evoked Potentials Laboratory, Behavioral Biology, Technion-Israel Institute of Technology, 32000, Haifa, Israel.
Brain Lang. 2002 Dec;83(3):367-83. doi: 10.1016/s0093-934x(02)00507-2.
Eighteen subjects listened to sentences ending with semantically congruent or incongruent words. Each congruent sentence was embedded at the end of a short story so that the final word was semantically acceptable at the sentence level but incongruent in terms of discourse context. The same stories were also presented with congruent endings. Auditory ERPs elicited by the final words in these sentences and stories were compared. Both sentence- and discourse-level semantic integration were associated with N400 and Late Positive Component (LPC) effects in addition to a new component, P550. Local and global semantic processing, although evoking the same components, were characterized by differential effects on ERP amplitudes according to the amount of text integrated and its congruence. These results indicate similar cognitive processes of context build up, underlying sentence- and discourse-semantic processing.
18名受试者听了以语义一致或不一致的单词结尾的句子。每个一致的句子都嵌入在一个短篇小说的结尾，这样最后一个单词在句子层面上语义上是可接受的，但在语篇语境中是不一致的。同样的故事也以一致的结尾呈现。比较了这些句子和故事中最后一个单词引发的听觉事件相关电位。句子和语篇层面的语义整合除了与一个新成分P550外，还与N400和晚期正成分（LPC）效应相关。局部和全局语义处理虽然引发相同的成分，但根据整合的文本量及其一致性，对事件相关电位振幅有不同的影响。这些结果表明，在句子和语篇语义处理背后，存在着类似的语境构建认知过程。
