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通过显性单词阅读 fMRI 激活和 DTI 结构连接测量的左颞叶和右颞叶癫痫之间的语言侧化差异。

Language lateralization differences between left and right temporal lobe epilepsy as measured by overt word reading fMRI activation and DTI structural connectivity.

机构信息

Department of Psychology, 9 Campus Drive, University of Saskatchewan, Saskatoon, SK S7N 5A5, Canada.

Division of Neurosurgery, Royal University Hospital, 103 Hospital Drive, Saskatoon, SK S7N 0W8, Canada.

出版信息

Epilepsy Behav. 2020 Nov;112:107467. doi: 10.1016/j.yebeh.2020.107467. Epub 2020 Sep 28.

Abstract

In cases of brain disease such as temporal lobe epilepsy (TLE), damage may lead to functional reorganization and a shift in language dominance to homolog regions in the other hemisphere. If the effects of TLE on language dominance are hemisphere-focused, then brain regions and connections involved in word reading should be less left-lateralized in left temporal lobe epilepsy (lTLE) than right temporal lobe epilepsy (rTLE) or healthy controls, and the opposite effect should be observed in patients with rTLE. In our study, functional magnetic resonance imaging (fMRI) showed that patients with rTLE had more strongly lateralized left hemisphere (LH) activation than patients with lTLE and healthy controls in language-related brain regions (pars opercularis and fusiform gyrus (FuG)). Corresponding with this difference, diffusion tensor imaging (DTI) found differences in connectivity indicative of patients with lTLE having greater tract integrity than patients with rTLE in the right hemisphere (RH) uncinate fasciculus (UF), inferior longitudinal fasciculus (ILF), and inferior fronto-occipital fasciculus (IFOF) using the network-based statistic analysis method. The UF, ILF, and IFOF tract integrity have previously been associated with lexical (whole-word) processing abilities. Multivariate distance matrix regression provided converging evidence for regions of the IFOF having different connectivity patterns between groups with lTLE and rTLE. This research demonstrates language lateralization differences between patient groups with lTLE and rTLE, and corresponding differences in the connectivity strength of the ILF, IFOF, and UF. This research provides a novel approach to measuring lateralization of language in general, and the fMRI and DTI findings were integral for guiding the neurosurgeons performing the TLE resections. This approach should inform future studies of language lateralization and language reorganization in patients such as those with TLE.

摘要

在颞叶癫痫(TLE)等脑部疾病的情况下,损伤可能导致功能重组,语言优势向对侧半球的同源区域转移。如果 TLE 对语言优势的影响是半球特异性的,那么涉及单词阅读的大脑区域和连接在左颞叶癫痫(lTLE)患者中应比右颞叶癫痫(rTLE)或健康对照组的左侧化程度更低,而在 rTLE 患者中应观察到相反的效果。在我们的研究中,功能磁共振成像(fMRI)显示,与健康对照组相比,rTLE 患者在与语言相关的脑区(岛盖部和梭状回(FuG))中左侧大脑半球(LH)的激活更为偏侧化。与这种差异相对应,弥散张量成像(DTI)发现连接性的差异表明,与 rTLE 患者相比,lTLE 患者右侧大脑半球(RH)的钩束(UF)、下纵束(ILF)和下额枕束(IFOF)的束完整性更高,使用网络基础统计分析方法。UF、ILF 和 IFOF 的束完整性以前与词汇(整体词)处理能力有关。多元距离矩阵回归为 lTLE 和 rTLE 患者组之间 IFOF 区域具有不同连接模式提供了收敛性证据。这项研究表明,lTLE 和 rTLE 患者组之间存在语言侧化差异,以及 ILF、IFOF 和 UF 的连接强度存在相应差异。这项研究为一般语言侧化的测量提供了一种新方法,fMRI 和 DTI 的发现为神经外科医生进行 TLE 切除术提供了指导。这种方法应该为未来 TLE 等患者的语言侧化和语言重组研究提供信息。

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