van den Brink Daniëlle, Brown Colin M, Hagoort Peter
F. C. Donders Centre for Cognitive Neuroimaging, Nijmegen, Netherlands.
J Exp Psychol Learn Mem Cogn. 2006 Mar;32(2):364-72. doi: 10.1037/0278-7393.32.3.364.
An event-related brain potential experiment was carried out to investigate the temporal relationship between lexical selection and the semantic integration in auditory sentence processing. Participants were presented with spoken sentences that ended with a word that was either semantically congruent or anomalous. Information about the moment in which a sentence-final word could uniquely be identified, its isolation point (IP), was compared with the onset of the elicited N400 congruity effect, reflecting semantic integration processing. The results revealed that the onset of the N400 effect occurred prior to the IP of the sentence-final words. Moreover, the factor early or late IP did not affect the onset of the N400. These findings indicate that lexical selection and semantic integration are cascading processes, in that semantic integration processing can start before the acoustic information allows the selection of a unique candidate and seems to be attempted in parallel for multiple candidates that are still compatible with the bottom-up acoustic input.
进行了一项与事件相关的脑电位实验，以研究听觉句子处理中词汇选择与语义整合之间的时间关系。向参与者呈现以语义一致或异常的单词结尾的口语句子。将关于句子末尾单词能够被唯一识别的时刻的信息，即其分离点（IP），与诱发的N400一致性效应的起始时间进行比较，该效应反映语义整合处理。结果显示，N400效应的起始时间发生在句子末尾单词的IP之前。此外，IP早或晚这一因素并不影响N400的起始时间。这些发现表明，词汇选择和语义整合是级联过程，即语义整合处理可以在声学信息允许选择唯一候选词之前就开始，并且似乎是针对多个仍与自下而上的声学输入兼容的候选词并行进行尝试的。
