中文摘要：

目的 运用静息态功能磁共振成像（resting-state fMRI）研究老年抑郁症和正常老年人情绪记忆网络的功能连接差异,并探讨老年抑郁症情绪记忆环路的变化.方法 老年抑郁症18名,正常老年人24名.利用3.0T MRI采集静息态功能数据,记录记忆提取行为学成绩.利用AFNI和SPSS 13.0分别对fMRI数据和行为学数据进行独立样本t检验和方差分析.结果 抑郁症减弱的连接包括杏仁核-丘脑/额下回、缘上回-前额叶背内侧/前扣带回、额中回-颞中回、丘脑-额下回/额叶眼区;增强的连接包括海马-前额叶腹内侧/颞中回/前扣带回/额叶眼区、颞中回-梭状回/额叶眼区、岛叶-颞中回/额叶眼动区、丘脑-尾状核（P＜0.05）.抑郁症中枢节点包括左侧杏仁核、右侧海马、右侧额中回及右侧岛叶.正常人中枢节点包括双侧杏仁核、右侧顶下小叶、双侧额中回及右侧岛叶.结论 老年抑郁症和正常老年人情绪记忆网络存在共性和差异,抑郁症右侧杏仁核及左侧额下回网络节点功能减弱,右侧海马网络节点功能代偿性增强.

英文摘要：

Objective To explore properties of emotion memory circuits in late-life depression,and differences in functional connectivity of emotional memory network between late-life depression and healthy controls who were investigated by resting-state fMRI.Methods Eighteen late life depression patients and twenty four healthy controls were involved in our study.Resting-state functional MRI data were acquired via 3.0T MRI scanner.Functional MRI data were analyzed.Behavioral data were acquired during retrieval.The independent samples t-test of functional MRI data and ANOVA of behavioral performance were performed with AFNI and SPSS 13.0 statistical software,respectively.Results Decreased connectivities had been shown in depression,including amygdala-thalamus,amygdala-left inferior frontal gyrus,supramarginal gyrus-dorsomedial prefrontal cortex/anterior cingulate cortex （ACC）,middle temporal gyrus-middle frontal gyrus and thalamus-inferior frontal gyros/left frontal eye fields （FEF） connectivity;while increased connectivities included hippocampus-middle temporal gyrus,hippocampusventromedial prefrontal cortex/middle temporal gyrus/ACC/FEF,middle temporal gyrus-fusiform gyrus/FEF,insula-middle temporal gyrus/FEF and thalamus-caudate connectivity （P〈0.05）.For depression,global hubs included left amygdale,right hippocampus,right middle frontal gyrus,and right insula.For healthy group,global hubs included bilateral amygdale and middle frontal gyrus,right anterior inferior parietal lobe and right insula.Conclusion There are common and different characters in functional connectivity of emotional memory network between depression and healthy control.Global hub function decreases in the right amygdale and left inferior frontal gyrus,while right hippocampus shows compensatory increase.