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White matter tracts alterations underpinning reward and conflict processing.

Arashk Mallahzadeh1, Mahan Shafie1, Mahdi Tahvilian1

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Summary

White matter integrity in specific brain tracts is linked to personality traits like behavioral activation and inhibition. This study reveals new neural network insights into reward-seeking and risk-taking behaviors.

Keywords:
Behavioral activation system (BAS)Behavioral inhibition system (BIS)ConnectometryDiffusion tensor imagingQuantitative anisotropyWhite matter

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Area of Science:

  • Neuroscience
  • Psychology
  • Radiology

Background:

  • Reinforcement sensitivity theory (RST) explains personality through neurobiological systems.
  • RST comprises the behavioral activation system (BAS) and behavioral inhibition system (BIS).
  • The role of white matter (WM) in BIS/BAS is less understood than gray matter.

Purpose of the Study:

  • Investigate the specific white matter (WM) tracts associated with BIS/BAS scores.
  • Explore gender differences in WM correlates of BIS/BAS.
  • Correlate diffusion MRI connectometry findings with personality subscales.

Main Methods:

  • Utilized diffusion MRI connectometry (DMRI) on 220 healthy participants from the LEMON database.
  • Administered the BIS/BAS questionnaire to assess personality traits.
  • Employed multiple regression models, controlling for age, handedness, and education.

Main Results:

  • Negative correlation found between quantitative anisotropy (QA) in the splenium of the corpus callosum, cerebellum, and cerebellar peduncles with BIS/BAS subscales.
  • Positive correlation observed between QA in the body of the corpus callosum and bilateral cingulum with BIS/BAS subscales.
  • Gender-specific analyses were conducted.

Conclusions:

  • White matter integrity in specific tracts is associated with behavioral activation and inhibition.
  • Findings enhance understanding of neural networks underlying risk-taking and reward-seeking behaviors.
  • Highlights the importance of WM in personality-related neural circuits.