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Schizophrenia, a severe psychiatric disorder, arises from a complex interplay of biological factors, including genetic predisposition, structural brain abnormalities, neurotransmitter dysregulation, and developmental irregularities. These factors collectively contribute to the onset and progression of the disorder, which typically manifests in late adolescence or early adulthood.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin...
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Microstate and Omega Complexity Analyses of the Resting-state Electroencephalography
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EEG microstates are a candidate endophenotype for schizophrenia.

Janir Ramos da Cruz1,2, Ophélie Favrod3, Maya Roinishvili4,5

  • 1Laboratory of Psychophysics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland. janir.ramos@epfl.ch.

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|June 20, 2020
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Schizophrenia endophenotypes were investigated using electroencephalogram (EEG) microstates. Patients with schizophrenia and their siblings exhibited altered microstate dynamics (classes C and D) compared to controls, suggesting a potential genetic marker.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Brain Imaging

Background:

  • Electroencephalogram (EEG) microstates are brief, stable scalp potential patterns.
  • Microstate dynamics, particularly classes C and D, are hypothesized as potential endophenotypes for schizophrenia.
  • Endophenotypes require demonstration of abnormalities in unaffected relatives of patients.

Purpose of the Study:

  • To investigate microstate dynamics in unaffected siblings of schizophrenia patients.
  • To compare microstate dynamics across patients with schizophrenia, their siblings, first-episode psychosis (FEP) patients, and healthy controls.

Main Methods:

  • Analysis of resting-state EEG recordings.
  • Examination of microstate dynamics, focusing on classes C and D.
  • Comparison of microstate presence between patient groups (schizophrenia, FEP) and control groups (siblings, healthy controls).

Main Results:

  • Patients with schizophrenia and their unaffected siblings showed increased presence of microstate class C compared to controls.
  • Patients with schizophrenia and their unaffected siblings exhibited decreased presence of microstate class D compared to controls.
  • No significant differences in microstate dynamics were observed between first-episode psychosis and chronic schizophrenia patients.

Conclusions:

  • The altered dynamics of microstate classes C and D in patients with schizophrenia and their siblings support their role as a candidate endophenotype.
  • These findings suggest a potential genetic contribution to schizophrenia risk reflected in specific EEG microstate patterns.