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Related Experiment Video

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Cognitive Effort and Schizophrenia Modulate Large-Scale Functional Brain Connectivity.

Christine Lycke Brandt1, Tobias Kaufmann2, Ingrid Agartz3

  • 1Norwegian Centre for Mental Disorders Research, KG Jebsen Centre for Psychosis Research, Division of Mental Health and Addiction, Oslo University Hospital & Institute of Clinical Medicine, University of Oslo, Oslo, Norway; c.l.brandt@medisin.uio.no.

Schizophrenia Bulletin
|March 4, 2015
PubMed
Summary
This summary is machine-generated.

Schizophrenia (SZ) involves brain connectivity disruptions. This study found reduced functional connectivity in SZ patients, particularly involving the insular network, which was independent of cognitive load.

Keywords:
brain networkscognitionindependent component analysispsychotic disorders

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • Schizophrenia (SZ) is characterized by cognitive dysfunction and disorganized thought, alongside hallucinations and delusions.
  • It is widely considered a disorder of brain connectivity, with ongoing research into network organization.
  • The impact of varying cognitive effort on SZ connectivity alterations remains largely unknown.

Purpose of the Study:

  • To investigate the effects of cognitive effort and schizophrenia on between-network functional connectivity.
  • To determine if connectivity alterations in SZ vary across different levels of cognitive load.
  • To identify specific brain networks involved in SZ pathophysiology and their response to cognitive demands.

Main Methods:

  • Utilized independent component analysis (ICA) and functional connectivity measures from functional magnetic resonance imaging (fMRI) data.
  • Examined 2 levels of cognitive load in a large sample of schizophrenia patients (n=99) and healthy controls (n=143).
  • Analyzed the interactions between large-scale brain networks, focusing on fronto-parietal, default-mode, and insular networks.

Main Results:

  • Cognitive load significantly influenced most functional connections, altering synchronization in fronto-parietal and default-mode networks.
  • Reduced functional connectivity in SZ patients was observed across load conditions, notably involving the insular network.
  • The interplay between brain networks was modulated by cognitive effort, but SZ-related connectivity reductions were load-independent.

Conclusions:

  • The insular network plays a crucial role in schizophrenia pathophysiology, interacting with default-mode and visual networks.
  • Functional connectivity alterations in schizophrenia appear to be a general brain network-level dysfunction, not solely dependent on cognitive load.
  • These findings highlight the importance of studying brain network dynamics under varying cognitive demands to understand schizophrenia.