Theta responses are involved in lexical-semantic retrieval during language processing
Theta responses are involved in lexical-semantic retrieval during language processing
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DOI：
10.1162/0898929053279469
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发表时间：
2005-03-01
影响因子：
3.2
通讯作者：
Hagoort, P
中科院分区：
文献类型：
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作者：
Bastiaansen, MCM;van der Linden, M;Hagoort, P
在语言处理过程中，在人类脑电图（EEG）中观察到的振荡神经元动力学与功能相干网络的动态形成有关，这些网络的作用是整合理解语言输入所需的不同信息源。为了进一步探索振荡同步在语言处理过程中的功能作用，我们量化了事件相关的EEG功率变化引起的开放类（OC）的话和封闭类（CC）的话在很宽的频率范围内（从I到30 Hz），而受试者读一个短篇小说。词语呈现诱导了三种振荡成分：θ功率增加（4-7 Hz），α功率减少（10-12 Hz）和β功率减少（16-21 Hz）。而α和β反应主要表现为两个词类之间的定量差异，θ反应OC的话和CC的话之间的质的差异：一个θ功率增加，发现在左颞区OC的话，但不是CC的话。左颞θ增加可以索引参与检索OC项目的词汇语义属性的网络的激活。
Oscillatory neuronal dynamics, observed in the human electroencephalogram (EEG) during language processing, have been related to the dynamic formation of functionally coherent networks that serve the role of integrating the different sources of information needed for understanding the linguistic input. To further explore the functional role of oscillatory synchrony during language processing, we quantified event-related EEG power changes induced by the presentation of open-class (OC) words and closed-class (CC) words in a wide range of frequencies (from I to 30 Hz), while subjects read a short story. Word presentation induced three oscillatory components: a theta power increase (4-7 Hz), an alpha power decrease (10-12 Hz), and a beta power decrease (16-21 Hz). Whereas the alpha and beta responses showed mainly quantitative differences between the two word classes, the theta responses showed qualitative differences between OC words and CC words: A theta power increase was found over left temporal areas for OC words, but not for CC words. The left temporal theta increase may index the activation of a network involved in retrieving the lexical-semantic properties of the OC items.