Voxel-based morphometry and cortical thickness in combat veterans suffering from impulsive aggression.

Area of Science:

• Neuroscience
• Psychiatry
• Neuroimaging

Background:

• Impulsive aggression is prevalent in psychiatric disorders and common among combat veterans.
• Understanding the neuroanatomical basis of combat-related impulsive aggression is crucial.

Purpose of the Study:

• To investigate the neuroanatomical correlates of impulsive aggression in combat veterans.
• To examine differences in brain structure between aggressive and non-aggressive combat veterans.

Main Methods:

• Magnetic resonance imaging (MRI) was used to acquire T1-weighted images from male veterans.
• Subcortical volumetry focused on the amygdala and hippocampus, while cortical thickness was measured in prefrontal regions.
• Regions of interest included basolateral/centromedial amygdala, hippocampus subdivisions, dorsolateral prefrontal cortex, orbitofrontal cortex, and anterior cingulate cortex.

Main Results:

• No significant differences in cortical thickness or subcortical grey matter volumes were found between groups.
• No significant correlations were observed between brain measures and psychometric assessments.
• An exploratory analysis revealed a significant group by anxiety interaction in the left lingual gyrus for cortical thickness.

Conclusions:

• Impulsive aggression in combat veterans may not be directly linked to structural changes in the amygdala, hippocampus, or specific cortical areas.
• The findings suggest a potential shared neural basis for impulsive aggression and anxiety, consistent with previous research.
• Further research is needed to elucidate the complex neural mechanisms underlying impulsive aggression and its comorbidity with anxiety in veterans.