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A voxel based morphometry study investigating brain structural changes in first episode psychosis.

David R Watson1, Julie M E Anderson, Feng Bai

  • 1Computational Neuroscience, ISRC, University of Ulster (Magee), Northland Road, Londonderry BT48 7JL, Northern Ireland, UK. dr.watson@ulster.ac.uk

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Radiology

Background:

  • Schizophrenia (SCZ) and bipolar disorder (BP) are linked to neuropathological brain changes affecting neural connectivity.
  • First episode psychosis offers a unique window to study early-stage brain alterations with fewer confounding factors.

Purpose of the Study:

  • To investigate and compare gray matter (GM) and white matter (WM) differences in patients with first episode SCZ and BP.
  • To identify neuroanatomical overlaps and distinctions between SCZ and BP at illness onset.

Main Methods:

  • Utilized voxel-based morphometry (VBM) on MRI data from 25 SCZ patients, 24 BP patients, and matched controls.
  • Analyzed GM and WM volume differences between patient groups and controls.

Main Results:

  • Both SCZ and BP groups showed discrete GM and WM deficits compared to controls, less pronounced than in later illness stages.
  • SCZ patients exhibited GM loss in cortical and limbic structures (hippocampus, thalamus, striatum, cerebellum) and WM alterations in limbic regions, corpus callosum, and lobes.
  • BP patients showed fewer volume changes, primarily in WM areas overlapping with SCZ findings (thalamus, cerebellum).

Conclusions:

  • Evidence of neuroanatomical overlap in brain structural changes between SCZ and BP at first episode, consistent with disrupted neural connectivity.
  • SCZ displays more extensive structural alterations than BP, indicating both shared and distinct neuropathological pathways.