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Related Concept Videos

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Related Experiment Video

Updated: Dec 12, 2025

A Middle Cerebral Artery Occlusion Technique for Inducing Post-stroke Depression in Rats
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Microstructural changes in the reward system are associated with post-stroke depression.

Lena K L Oestreich1, Paul Wright2, Michael J O'Sullivan3

  • 1UQ Centre for Clinical Research, The University of Queensland, Brisbane, Australia; Centre for Advanced Imaging, The University of Queensland, Brisbane, Australia.

Neuroimage. Clinical
|August 16, 2020
PubMed
Summary
This summary is machine-generated.

Post-stroke depression (PSD) is linked to changes in the brain's reward system, including reduced white matter integrity and increased free water. These structural changes may predict depression severity after stroke.

Keywords:
ConnectomeGrey matterMagnetic resonance imaging (MRI)NeuroinflammationPost-stroke depression (PSD)White matter

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Area of Science:

  • Neuroimaging
  • Neuroscience
  • Neurology

Background:

  • Traditional lesion studies fail to map single brain regions to post-stroke depression (PSD).
  • The reward system is implicated in major depressive disorder, prompting investigation into its role in PSD.

Purpose of the Study:

  • To investigate structural correlates within the brain's reward system and their association with PSD.
  • To identify potential biomarkers for depression vulnerability post-stroke.

Main Methods:

  • Used 3T MRI (structural and diffusion) on 16 healthy controls, 12 stroke patients with PSD, and 34 without PSD.
  • Employed graph theory and whole-brain connectome analyses.
  • Examined reward system grey matter volumes and white matter pathways (medial forebrain bundle, cingulum) using fractional anisotropy (FA) and free water (FW).

Main Results:

  • PSD patients showed decreased FA-weighted and increased FW-weighted connectivity in reward system subnetworks compared to controls.
  • Reward system structural integrity (FA, FW, grey matter volume) collectively predicted 37.8% of depression severity variance.

Conclusions:

  • PSD is associated with reward system grey matter volume loss, reduced FA, and increased FW, mirroring findings in non-stroke depression.
  • Structural characterization of the reward system shows promise as a biomarker for predicting depression after stroke.