Previous neuroimaging studies have suggested that major depressive disorder (MDD) may be correlated with changes in regional- or network-level brain function. The purposes of the present study were to investigate changes of amplitude of low-frequency fluctuation (ALFF) and functional connectivity (FC) in bilateral hippocampus by resting-state functional magnetic resonance imaging (rs-fMRI) in first-episode drug-naive major depressive disorder (MDD) patients. Our findings demonstrate that the hippocampus and dACC contribute to the underlying pathophysiology of MDD at an early-stage.
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