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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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Thalamocortical dysconnectivity in schizophrenia.

Neil D Woodward1, Haleh Karbasforoushan, Stephan Heckers

  • 1Psychotic Disorders and Psychiatric Neuroimaging Programs, Department of Psychiatry, Vanderbilt University School of Medicine, Nashville, TN, USA. neil.woodward@vanderbilt.edu

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Schizophrenia alters brain connectivity, showing reduced prefrontal-thalamic connections and increased motor/somatosensory-thalamic connections. These thalamocortical network differences may stem from disrupted brain maturation processes.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Brain Imaging

Background:

  • Thalamus and cerebral cortex have topographically organized, reciprocal connections.
  • Previous studies indicate thalamic abnormalities in schizophrenia.
  • Thalamocortical network involvement in schizophrenia remains unclear.

Purpose of the Study:

  • To investigate differential effects on thalamocortical networks in schizophrenia.
  • To examine functional connectivity between cortical and thalamic regions using resting-state fMRI.

Main Methods:

  • Resting-state fMRI was performed on 77 healthy subjects and 62 patients with schizophrenia.
  • Cortical regions (prefrontal, motor, somatosensory, temporal, parietal, occipital) were used to define thalamic subdivisions.
  • Seed-based functional connectivity analysis was applied to BOLD time series.

Main Results:

  • Cortical areas showed specific correlations with thalamic regions in both groups.
  • Schizophrenia patients exhibited reduced prefrontal-thalamic and increased motor/somatosensory-thalamic connectivity.
  • Connectivity changes were independent of gray matter and medication; no differences were found in temporal, parietal, or occipital networks.

Conclusions:

  • Findings demonstrate differential thalamocortical network abnormalities in schizophrenia.
  • Schizophrenia's etiology may impair prefrontal-thalamic development and somatomotor thalamic refinement during maturation.