Oscillatory neuronal dynamics during language comprehension

被引:197
作者
Bastiaansen, Marcel [1 ]
Hagoort, Peter [1 ]
机构
[1] Radboud Univ Nijmegen, FC Donders Ctr Cognit Neuroimaging, NL-6500 HB Nijmegen, Netherlands
来源
EVENT-RELATED DYNAMICS OF BRAIN OSCILLATIONS | 2006年 / 159卷
关键词
language comprehension; unification; syntax; semantics; neuronal synchronization; oscillatory dynamics; EEG power; EEG coherence;
D O I
10.1016/S0079-6123(06)59012-0
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Language comprehension involves two basic operations: the retrieval of lexical information (Such as phonologic, syntactic, and semantic information) from long-term memory, and the unification of this information into a coherent representation of the overall utterance. Neuroimaging studies using hemodynamic measures such as PET and fMRI have provided detailed information on which areas of the brain are involved in these language-related memory and unification operations. However, much less is known about the dynamics of the brain's language network. This chapter presents a literature review of the oscillatory neuronal dynamics of EEG and MEG data that can be observed during language comprehension tasks. From a detailed review of this (rapidly growing) literature the following picture emerges: memory retrieval operations are mostly accompanied by increased neuronal synchronization in the theta frequency range (4-7 Hz). Unification operations, in contrast, induce high-frequency neuronal synchronization in the beta (12-30 Hz) and gamma (above 30 Hz) frequency bands. A desynchronization in the (upper) alpha frequency band is found for those Studies that use secondary tasks, and seems to correspond with attentional processes, and with the behavioral consequences of the language comprehension process. We conclude that it is possible to capture the dynamics of the brain's language network by a careful analysis of the event-related changes in power and coherence of EEG and MEG data in a wide range of frequencies, in combination with subtle experimental manipulations in a range of language comprehension tasks. It appears then that neuronal synchrony is a mechanism by which the brain integrates the different types of information about language (such as phonological, orthographic, semantic, and syntactic information) represented in different brain areas.
引用
收藏
页码:179 / 196
页数:18
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