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Brain structures and functional connectivity associated with individual differences in trait proactive aggression.

Wenfeng Zhu1, Xiaolin Zhou2,3,4, Ling-Xiang Xia5

  • 1Research Center of Psychology and Social Development, Southwest University, 400715, Chongqing, China.

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Summary
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Neuroimaging reveals distinct brain patterns for proactive aggression. Higher grey matter density in the dorsolateral prefrontal cortex and lower density in the posterior cingulate cortex correlate with proactive aggression tendencies.

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Area of Science:

  • Neuroscience
  • Psychology
  • Brain Imaging

Background:

  • Reactive aggression, triggered by provocation, is well-studied.
  • Proactive aggression, driven by instrumental gain, has less understood neural correlates.
  • Individual differences in proactive aggression are significant.

Purpose of the Study:

  • Investigate brain structures and functional networks linked to trait proactive aggression.
  • Differentiate neural bases of proactive versus reactive aggression.

Main Methods:

  • Combined structural and functional magnetic resonance imaging (fMRI).
  • Measured grey matter density (GMD) and resting-state functional connectivity (RSFC).
  • Correlated brain measures with individual differences in trait proactive aggression.

Main Results:

  • Trait proactive aggression positively associated with GMD in bilateral dorsolateral prefrontal cortex (DLPFC).
  • Negatively correlated with GMD in posterior cingulate cortex (PCC).
  • Reduced functional connectivity between left PCC and regions including right DLPFC, IPL, MPFC/ACC, and precuneus.

Conclusions:

  • Identified specific brain structures and networks underlying proactive aggression.
  • Highlighted differential neural underpinnings compared to reactive aggression.
  • Provided insights into the neural basis of individual differences in proactive aggression.