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Structure-function coupling in white matter uncovers the abnormal brain connectivity in Schizophrenia.

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Individuals with schizophrenia exhibit reduced white matter (WM) structure-function coupling, indicating impaired neuronal information transfer. This dysfunction in WM tracts correlates with symptom severity and illness duration, supporting the dysconnectivity hypothesis.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Medical Imaging

Background:

  • Schizophrenia is characterized by a dysconnectivity syndrome, with evidence of impaired structural and functional integration.
  • White matter (WM) microstructural abnormalities are frequently reported in schizophrenia, but WM dysfunction and its relationship with function remain unclear.

Purpose of the Study:

  • To develop and validate a novel measurement of structure-function coupling in WM to assess neuronal information transfer.
  • To investigate the associations between white matter structure and function in individuals with schizophrenia (SZ) compared to healthy volunteers (HV).

Main Methods:

  • Utilized functional and diffusion magnetic resonance imaging (MRI) data from 75 SZ and 89 HV.
  • Developed a novel metric combining spatial-temporal functional signal correlations with diffusion tensor orientations in WM circuits.
  • Validated the structure-function coupling measurement in the HV group to assess neural signal transfer capacity.

Main Results:

  • Schizophrenia patients showed widespread decreases in WM structure-function coupling compared to healthy volunteers.
  • Affected WM regions included the corticospinal tract and superior longitudinal fasciculus.
  • Decreased structure-function coupling in WM tracts significantly correlated with psychotic symptom severity and illness duration.

Conclusions:

  • Abnormal neuronal signal transfer in WM tracts, quantified by reduced structure-function coupling, may be a key neuropathological mechanism in schizophrenia.
  • This study supports the dysconnectivity hypothesis of schizophrenia by highlighting impaired circuit function within WM networks.
  • White matter networks play a critical role in the pathophysiology of schizophrenia.