中文摘要：

语义整合帮助人们在阅读理解中将小信息块整合成一个完整、连贯的句子意义表达，是阅读理解中非常重要的认知过程。通过对比40多篇句子加工相关的脑机制研究，发现左侧额下回在fMRI研究中是参与语义整合加工激活概率最高的区域，而颞叶及后部是MEG研究中激活概率最高的区域。另外，左侧额下回是如何参与语义整合、它在内隐和外显语义整合中的机制是否相同、以及这种整合加工与一般的控制性加工、词汇启动的关系都是研究者广泛关注的问题。本文对上述问题进行了详细的综述和讨论。

英文摘要：

Semantic unification, the process that combines word-level semantics into an overall meaning representation of an utterance, is a crucial aspect of language comprehension. Although many brain imaging studies using fMRI and MEG techniques have associated left inferior frontal gyrus （LIFG） and posterior temporal regions with semantic unification, there are also contradictory findings and alternative explanations attributing the observed LIFG activation to other processes such as controlled semantic retrieval and general selection. Based on review of the present empirical evidence and theoretical arguments, future directions are suggested to reveal the mechanism of semantic unification and its underlying neural substrates.