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Shifted Coupling of EEG Driving Frequencies and fMRI Resting State Networks in Schizophrenia Spectrum Disorders

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  • Nadja Razavi
  • Kay Jann
  • Thomas Koenig
  • Mara Kottlow
  • Martinus Hauf
  • Werner Strik
  • Thomas Dierks

Abstract

Introduction: The cerebral resting state in schizophrenia is altered, as has been demonstrated separately by electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) resting state networks (RSNs). Previous simultaneous EEG/fMRI findings in healthy controls suggest that a consistent spatiotemporal coupling between neural oscillations (EEG frequency correlates) and RSN activity is necessary to organize cognitive processes optimally. We hypothesized that this coupling is disorganized in schizophrenia and related psychotic disorders, in particular regarding higher cognitive RSNs such as the default-mode (DMN) and left-working-memory network (LWMN). Methods: Resting state was investigated in eleven patients with a schizophrenia spectrum disorder (n = 11) and matched healthy controls (n = 11) using simultaneous EEG/fMRI. The temporal association of each RSN to topographic spectral changes in the EEG was assessed by creating Covariance Maps. Group differences within, and group similarities across frequencies were estimated for the Covariance Maps. Results: The coupling of EEG frequency bands to the DMN and the LWMN respectively, displayed significant similarities that were shifted towards lower EEG frequencies in patients compared to healthy controls. Conclusions: By combining EEG and fMRI, each measuring different properties of the same pathophysiology, an aberrant relationship between EEG frequencies and altered RSNs was observed in patients. RSNs of patients were related to lower EEG frequencies, indicating functional alterations of the spatiotemporal coupling. Significance: The finding of a deviant and shifted coupling between RSNs and related EEG frequencies in patients with a schizophrenia spectrum disorder is significant, as it might indicate how failures in the processing of internal and external stimuli, as commonly seen during this symptomatology (i.e. thought disorders, hallucinations), arise.

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  • Nadja Razavi & Kay Jann & Thomas Koenig & Mara Kottlow & Martinus Hauf & Werner Strik & Thomas Dierks, 2013. "Shifted Coupling of EEG Driving Frequencies and fMRI Resting State Networks in Schizophrenia Spectrum Disorders," PLOS ONE, Public Library of Science, vol. 8(10), pages 1-11, October.
    • Handle: RePEc:plo:pone00:0076604
    DOI: 10.1371/journal.pone.0076604
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    1. Sukanta Saha & David Chant & Joy Welham & John McGrath, 2005. "A Systematic Review of the Prevalence of Schizophrenia," PLOS Medicine, Public Library of Science, vol. 2(5), pages 1-1, May.
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