title: Abnormal default-mode network homogeneity in first-episode, drug-naive major depressive disorder.
abstract: BACKGROUND
  Default mode network (DMN) is one of the most commonly recognized resting-state networks in major depressive disorder (MDD). However, the homogeneity of this network in MDD is poorly understood. As such, this study was conducted to determine whether or not an abnormal network homogeneity (NH) of DMN is observed in patients with first-episode and drug-naive MDD.
  
  
  METHODS
  Twenty-four first-episode drug-naive patients with MDD and twenty-four healthy control subjects participated in the study. NH and independent component analysis (ICA) methods were used to analyze data.
  
  
  RESULTS
  Depressed patients exhibited a significantly increased NH in the left dorsal medial prefrontal cortex (MPFC) and decreased NH in the right inferior temporal gyrus (ITG) compared with the healthy control subjects. Receiver operating characteristic curves (ROC) were analyzed and results revealed that the NH values of MPFC and ITG could be applied as candidate markers with relatively high sensitivity and specificity to distinguish patients from healthy control subjects. No correlation was observed between the NH values of the two regions and clinical variables.
  
  
  CONCLUSIONS
  Our findings suggested that an abnormal DMN homogeneity could be observed in MDD, which highlight the importance of the DMN in the pathophysiology of MDD.
authors.affiliation: Mental Health Center, the First Affiliated Hospital, Guangxi Medical University, Nanning, Guangxi, China.
authors.forename: Wenbin
authors.initials: W
authors.lastname: Guo
authors.affiliation: Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.affiliation: Mental Health Center, the First Affiliated Hospital, Guangxi Medical University, Nanning, Guangxi, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Mental Health Center, the First Affiliated Hospital, Guangxi Medical University, Nanning, Guangxi, China.
authors.forename: Zhikun
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Mental Health Center, the First Affiliated Hospital, Guangxi Medical University, Nanning, Guangxi, China.
authors.forename: Liuyu
authors.initials: L
authors.lastname: Yu
authors.affiliation: Mental Health Center, the First Affiliated Hospital, Guangxi Medical University, Nanning, Guangxi, China.
authors.forename: Jianrong
authors.initials: J
authors.lastname: Liu
authors.affiliation: Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan, China.
authors.forename: Huafu
authors.initials: H
authors.lastname: Chen
authors.affiliation: Mental Health Center, the First Affiliated Hospital, Guangxi Medical University, Nanning, Guangxi, China.
authors.forename: Changqing
authors.initials: C
authors.lastname: Xiao
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D003710:Demography; D003865:Major Depressive Disorder / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D009415:Nerve Net / Q000503:physiopathology*; D012372:ROC Curve