State-related functional integration and functional segregation brain networks in schizophrenia

Qingbao Yu, Jing Sui, Kent A. Kiehl, Godfrey Pearlson, Vince D. Calhoun

    Research output: Contribution to journalArticle

    Abstract

    Altered topological properties of brain connectivity networks have emerged as important features of schizophrenia. The aim of this study was to investigate how the state-related modulations to graph measures of functional integration and functional segregation brain networks are disrupted in schizophrenia. Firstly, resting state and auditory oddball discrimination (AOD) fMRI data of healthy controls (HCs) and schizophrenia patients (SZs) were decomposed into spatially independent components (ICs) by group independent component analysis (ICA). Then, weighted positive and negative functional integration (inter-component networks) and functional segregation (intra-component networks) brain networks were built in each subject. Subsequently, connectivity strength, clustering coefficient, and global efficiency of all brain networks were statistically compared between groups (HCs and SZs) in each state and between states (rest and AOD) within group. We found that graph measures of negative functional integration brain network and several positive functional segregation brain networks were altered in schizophrenia during AOD task. The metrics of positive functional integration brain network and one positive functional segregation brain network were higher during the resting state than during the AOD task only in HCs. These findings imply that state-related characteristics of both functional integration and functional segregation brain networks are impaired in schizophrenia which provides new insight into the altered brain performance in this brain disorder.

    Original languageEnglish (US)
    Pages (from-to)450-458
    Number of pages9
    JournalSchizophrenia Research
    Volume150
    Issue number2-3
    DOIs
    StatePublished - Nov 1 2013

    Keywords

    • Brain graph
    • Brain state
    • ICA
    • Integration
    • Schizophrenia
    • Segregation

    ASJC Scopus subject areas

    • Psychiatry and Mental health
    • Biological Psychiatry

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