Trait aggressiveness is not related to structural connectivity between orbitofrontal cortex and amygdala
Frederike Beyer1, Thomas F Münte1, Juliana Wiechert1
1Dept. of Neurology, University of Lübeck, Lübeck, Germany.
Plos One
|July 1, 2014
Summary
This study found no link between structural brain connectivity and normal aggression levels in healthy men. Orbitofrontal cortex (OFC) and amygdala white matter integrity did not correlate with trait aggressiveness or anger.
Area of Science:
- Neuroscience
- Psychology
- Brain Imaging
Background:
- Altered functional connectivity between the orbitofrontal cortex (OFC) and amygdala is implicated in anger and aggression.
- Structural connectivity changes in OFC-amygdala pathways are observed in pathological aggression.
- The relationship between white matter integrity and aggression in healthy individuals remains unstudied.
Purpose of the Study:
- To investigate the association between trait aggressiveness and structural connectivity of the OFC-amygdala pathway in healthy young men.
- To examine if white matter integrity, specifically along the uncinate fascicle, relates to normal-range aggression and anger.
Main Methods:
- Utilized diffusion tensor imaging (DTI) to assess white matter integrity.
- Measured fractional anisotropy (FA) and mean diffusivity (MD) along the uncinate fascicle in 93 healthy young men.
- Compared DTI measures between participants categorized as high or low in physical aggressiveness and trait anger.
Main Results:
- No significant differences in FA or MD were found between high and low aggressiveness groups.
- No significant differences in FA or MD were observed between high and low trait anger groups.
- Structural OFC-amygdala connectivity did not differ based on levels of aggressiveness or anger.
Conclusions:
- The study provides evidence against a direct relationship between structural OFC-amygdala connectivity and normal-range trait aggressiveness.
- Findings suggest that white matter integrity in this pathway is not a key factor in typical variations of anger and aggression in healthy young men.
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