Cognitive effort and schizophrenia modulate large-scale functional brain connectivity

Christine Lycke Brandt, Tobias Kaufmann, Ingrid Agartz, Kenneth Hugdahl, Jimmy Jensen, Torill Ueland, Beathe Haatveit, Kristina C. Skatun, Nhat Trung Doan, Ingrid Melle, Ole A. Andreassen, Lars T. Westlye

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    Schizophrenia (SZ) is characterized by cognitive dysfunction and disorganized thought, in addition to hallucinations and delusions, and is regarded a disorder of brain connectivity. Recent efforts have been made to characterize the underlying brain network organization and interactions. However, to which degree connectivity alterations in SZ vary across different levels of cognitive effort is unknown. Utilizing independent component analysis (ICA) and methods for delineating functional connectivity measures from functional magnetic resonance imaging (fMRI) data, we investigated the effects of cognitive effort, SZ and their interactions on between-network functional connectivity during 2 levels of cognitive load in a large and well-characterized sample of SZ patients (n = 99) and healthy individuals (n = 143). Cognitive load influenced a majority of the functional connections, including but not limited to fronto-parietal and default-mode networks, reflecting both decreases and increases in between-network synchronization. Reduced connectivity in SZ was identified in 2 large-scale functional connections across load conditions, with a particular involvement of an insular network. The results document an important role of interactions between insular, default-mode, and visual networks in SZ pathophysiology. The interplay between brain networks was robustly modulated by cognitive effort, but the reduced functional connectivity in SZ, primarily related to an insular network, was independent of cognitive load, indicating a relatively general brain network-level dysfunction.

    Original languageEnglish
    Pages (from-to)1360-1369
    Number of pages9
    JournalSchizophrenia Bulletin
    Volume41
    Issue number6
    DOIs
    Publication statusPublished - 2015

    Swedish Standard Keywords

    • Psychology (501)

    Keywords

    • brain networks
    • cognition
    • independent component analysis
    • psychotic disorders

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