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Cognitive Functioning in Temporal Lobe Epilepsy: A BOLD-fMRI Study

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Abstract

We aimed to analyze the association between resting-state functional magnetic resonance imaging (re-fMRI) and cognitive function (including language, executive, and memory functions) in temporal lobe epilepsy (TLE) patients, which will help to explore the mechanism of brain function in patients. 15 TLE patients and 15 non-TLE patients were recruited. All subjects underwent neuropsychological testing and memory functional evaluation. Changes in verbal intelligence quotient (VIQ), performance intelligence quotient (PIQ), full intelligence quotient (FIQ), and memory quotient (MQ) were compared between two groups. Re-fMRI data were also collected from two groups to evaluate these changes. Each individual score of neuropsychological testing and memory functional evaluation were higher in control group, which was statistically different (all P < 0.01) while the VIQ, PIQ, FIQ, and MQ showed the same trend (all P < 0.01). The data showed the positive activation differences in brain regions between experimental and control group, namely right frontal lobe, the left middle temporal gyrus back, right superior temporal gyrus, left cerebellum, left angular gyrus, left wedge anterior lobe, and left central back; while the negatively activated brain regions were left prefrontal, right cerebellum, right corner back, and right anterior cingulate gyrus. During the language task, the activated brain regions of the TLE patients were right prefrontal lobe, the lateral temporal gyri, the left cerebellum, left cornu laterale gyrus, left precuneus, and the left postcentral gyrus, whereas the negatively activated brain areas were the left prefrontal cortex, the right cerebellum, right cornu laterale gyrus, and the right anterior cingulate gyrus. During the executive task, epilepsy patients showed activation difference in right prefrontal and right frontal lobe and right brain, left superior temporal gyrus, and right cerebellum anterior lobe compared with the control group; no negatively activated differences in brain areas. During the memory task, the difference lay in bilateral anterior cingulate gyrus and bilateral wedge anterior lobe while the negatively activated brain areas were the left inferior frontal gyrus and postcentral gyrus. The cognitive functioning is related to the functional connectivity within the cortex. There is a significant difference in the activation of brain areas during different tasks between the TLE patients and the non-TLE patients.

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Authors and Affiliations

  1. Department of Medical Imaging, Huai’an First People’s Hospital, Nanjing Medical University, Huai’an, Jiangsu Province, People’s Republic of China

    Lili Guo, Genji Bai, Hui Zhang, Daoyan Lu & Jiyong Zheng

  2. Department of Surgery, Huai’an First People’s Hospital, Nanjing Medical University, Huai’an, Jiangsu Province, People’s Republic of China

    Gang Xu

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  1. Lili Guo
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  2. Genji Bai
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  4. Daoyan Lu
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Correspondence to Genji Bai or Gang Xu.

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Guo, L., Bai, G., Zhang, H. et al. Cognitive Functioning in Temporal Lobe Epilepsy: A BOLD-fMRI Study. Mol Neurobiol 54, 8361–8369 (2017). https://doi.org/10.1007/s12035-016-0298-0

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