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Suicidal thoughts and behaviours (STBs) are linked to white matter abnormalities. This meta-analysis found reduced fractional anisotropy (FA) in key brain pathways, suggesting compromised emotion and sensory processing in individuals with STBs.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Medical Imaging

Background:

  • Suicidal thoughts and behaviours (STBs) represent a significant public health issue.
  • Research has primarily focused on grey matter abnormalities, with less attention paid to white matter tracts in STBs.

Purpose of the Study:

  • To conduct the first meta-analysis of diffusion tensor imaging (DTI) studies to identify robust white matter microstructure abnormalities in individuals with STBs compared to controls.
  • To elucidate the specific white matter pathways compromised in STBs.

Main Methods:

  • A voxel-based meta-analysis of 14 DTI datasets, including 289 individuals with STBs and 506 controls.
  • Utilized anisotropic effect-size signed differential mapping to analyze fractional anisotropy (FA) differences.

Main Results:

  • Individuals with STBs exhibited significantly lower FA in bilateral inferior longitudinal fasciculus, inferior frontal-occipital fasciculus, uncinate fasciculus, fornix, cingulum bundle, and corpus callosum body compared to controls.
  • No regions showed increased FA. Findings were consistent in adult and drug-free subgroups.
  • Decreased FA in the right fronto-limbic-occipital cluster was more pronounced in younger individuals and females with STBs.

Conclusions:

  • STBs are associated with microstructural white matter abnormalities, particularly in ventral fronto-limbic, visual-limbic-OFC, and callosal body pathways.
  • These findings suggest compromised neural pathways involved in emotion and sensory processing in individuals with STBs.
  • Understanding these neurobiological abnormalities is crucial for developing targeted treatments to reduce suicide deaths.