The neural basis of the right visual field advantage in reading: An MEG analysis using virtual electrodes
The neural basis of the right visual field advantage in reading: An MEG analysis using virtual electrodes
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DOI：
10.1016/j.bandl.2010.09.003
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发表时间：
2011-09-01
影响因子：
2.5
通讯作者：
Ellis, Andrew W.
中科院分区：
文献类型：
--
作者：
Barca, Laura;Cornelissen, Piers;Ellis, Andrew W.
右利手的参与者对右视野（RVF）中呈现的书面文字的反应比左视野（LVF）中的反应更快，更准确。以前试图确定裂谷热优势的神经基础，但成功有限。实验1是一个行为研究的偏侧化的单词命名，建立了实验2中使用的话，后来表现出可靠的RVF优势，持续多次重复。在实验2中，同样的话交错与乱字，并提出了在LVF和RVF右撇子的参与者坐在MEG扫描仪。参与者默读真实的单词，并对打乱的单词秘密地做出“模式”的反应。波束形成器分析创建了大脑内振荡功率变化的统计图。这些全脑地图显示，左心室颤动和右心室颤动的词汇都激活了阅读网络。虚拟电极分析使用相同的波束形成方法来重建对两个半球中的三个感兴趣区域中的真实的和加扰单词的响应。枕中回对对侧刺激的反应比同侧刺激的反应更快、更强，有证据表明信息不对称地传入左半球。左中梭状回在网站的“视觉文字形式区”的反应更强烈，RVF比LVF的话。言语运动皮层的活动偏向左半球，对裂谷热的反应比对左心室颤动的反应更强烈，这被解释为裂谷热在命名书面文字方面的优势的近端原因。(C)2010年爱思唯尔公司All rights reserved.
Right-handed participants respond more quickly and more accurately to written words presented in the right visual field (RVF) than in the left visual field (LVF). Previous attempts to identify the neural basis of the RVF advantage have had limited success. Experiment 1 was a behavioral study of lateralized word naming which established that the words later used in Experiment 2 showed a reliable RVF advantage which persisted over multiple repetitions. In Experiment 2, the same words were interleaved with scrambled words and presented in the LVF and RVF to right-handed participants seated in an MEG scanner. Participants read the real words silently and responded "pattern" covertly to the scrambled words. A beamformer analysis created statistical maps of changes in oscillatory power within the brain. Those whole-brain maps revealed activation of the reading network by both LVF and RVF words. Virtual electrode analyses used the same beamforming method to reconstruct the responses to real and scrambled words in three regions of interest in both hemispheres. The middle occipital gyri showed faster and stronger responses to contralateral than to ipsilateral stimuli, with evidence of asymmetric channeling of information into the left hemisphere. The left mid fusiform gyrus at the site of the 'visual word form area' responded more strongly to RVF than to LVF words. Activity in speech-motor cortex was lateralized to the left hemisphere, and stronger to RVF than LVF words, which is interpreted as representing the proximal cause of the RVF advantage for naming written words. (C) 2010 Elsevier Inc. All rights reserved.