I see what you mean: Theta power increases are involved in the retrieval of lexical semantic information
I see what you mean: Theta power increases are involved in the retrieval of lexical semantic information
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DOI：
10.1016/j.bandl.2007.10.006
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发表时间：
2008-07-01
影响因子：
2.5
通讯作者：
Hagoort, Peter
中科院分区：
文献类型：
--
作者：
Bastiaansen, Marcel C. M.;Oostenveld, Robert;Hagoort, Peter
关于心理词典的神经基础的一个有影响力的假设是，语义表征在神经上被实施为携带感觉、运动和/或更抽象的功能信息的分布式网络。本研究考察了词汇的语义特征是否在一定程度上决定了这类网络的拓扑结构。受试者在完成视觉词汇判断任务的同时记录了他们的脑电。我们比较了视觉语义属性(Vis，指颜色和形状)和听觉语义属性(AUD，指声音)对名词的脑电反应。脑电的时频分析显示，在theta(4-7 Hz)和下β(13-18 Hz)频段，脑电的功率增加，而在α(8-12 Hz)频段，早期的功率增加，随后的功率减少。在theta波段，我们观察到了双重分离：在AUD条件下，颞叶电极表现出更大的theta功率增加，而在Vis条件下，枕叶导联表现出更大的theta反应。结果支持语义表征存储在功能网络中的观点，其拓扑结构反映了存储项目的语义属性，并提供了进一步的证据，证明在theta频率范围内的振荡脑动力学在功能上与词汇语义信息的提取有关。(C)2008年，爱思唯尔公司出版。
An influential hypothesis regarding the neural basis of the mental lexicon is that semantic representations are neurally implemented as distributed networks carrying sensory, motor and/or more abstract functional information. This work investigates whether the semantic properties of words partly determine the topography of such networks.Subjects performed a visual lexical decision task while their EEG was recorded. We compared the EEG responses to nouns with either visual semantic properties (VIS, referring to colors and shapes) or with auditory semantic properties (AUD, referring to sounds).A time-frequency analysis of the EEG revealed power increases in the theta (4-7 Hz) and lower-beta (13-18 Hz) frequency bands, and an early power increase and subsequent decrease for the alpha (8-12 Hz) band. In the theta band we observed a double dissociation: temporal electrodes showed larger theta power increases in the AUD condition, while occipital leads showed larger theta responses in the VIS condition.The results support the notion that semantic representations are stored in functional networks with a topography that reflects the semantic properties of the stored items, and provide further evidence that oscillatory brain dynamics in the theta frequency range are functionally related to the retrieval of lexical semantic information. (C) 2008 Published by Elsevier Inc.