• Hong Li, Caihong Ji, Lujia Zhu, Peiyu Huang, Biao Jiang, Xiaojun Xu, Jianzhong Sun, Zhong Chen, Meiping Ding, Minming Zhang, and Shuang Wang.
• Department of Radiology, Second Affiliated Hospital, School of Medicine, Zhejiang University, China.
• Clin Neurophysiol. 2017 May 1; 128 (5): 830-838.

ObjectiveTo investigate the pattern of functional demarcation of hippocampal network and its relationship with memory performance in mesial temporal lobe epilepsy (mTLE) with unilateral hippocampal sclerosis.MethodsResting state fMRI data were acquired from fifteen left mTLE patients, fourteen right mTLE patients and twenty healthy subjects. We explore the hippocampal-cortical alterations and corresponding inter-hemispheric functional connectivity (FC) across anterior and posterior hippocampal networks. The association between FC and memory performance was assessed.ResultsLeft mTLE showed increased intra-hemispheric FC in anterior hippocampal networks, including left anterior hippocampal-entorhinal cortex and right anterior hippocampal-orbitofrontal cortex, and decreased inter-hemispheric FC between anterior hippocampus, entorhinal cortex and posterior cingulate cortex. Right mTLE was associated with extensive reduction in inter-hemispheric FC along the areas of anterior and posterior hippocampal networks. Intra-hemispheric FC between left anterior hippocampus and entorhinal cortex was positively correlated with verbal memory in left mTLE. Inter-hemispheric FC between posterior parahippocampal gyrus was negatively correlated with verbal memory in right mTLE.ConclusionsOur findings suggested that left and right mTLE exhibit different neural reorganization patterns of anterior and posterior hippocampal networks associated with verbal memory.SignificanceThe findings may facilitate the characterization of mTLE associated with memory deficit.Copyright © 2017 International Federation of Clinical Neurophysiology. Published by Elsevier B.V. All rights reserved.

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