Inward versus reward: white matter pathways in extraversion.

Area of Science:

• Neuroscience
• Psychology
• Brain Imaging

Background:

• Extraversion, a key personality trait, significantly influences social behavior.
• Understanding the neurobiological underpinnings of personality traits like extraversion is crucial.
• Previous research on extraversion and brain structure is limited, particularly concerning white matter (WM).

Purpose of the Study:

• To investigate the relationship between extraversion and white matter (WM) microstructure in detail.
• To explore how WM integrity differs in individuals with varying levels of extraversion.

Main Methods:

• Utilized diffusion tensor imaging (DTI) to assess WM integrity in 35 healthy volunteers.
• Measured white matter microstructure using fractional anisotropy, axial, and radial diffusivities.
• Assessed extraversion using the Eysenck Personality Questionnaire-Revised.

Main Results:

• Found decreased white matter (WM) connectivity in the right inferior fronto-occipital fasciculus and forceps major in individuals with high extraversion.
• Correlation analyses revealed significant associations between extraversion scores and WM integrity measures.

Conclusions:

• Individual differences in extraversion may be associated with distinct white matter (WM) organization.
• These WM tracts connect frontal, temporal, and occipital areas crucial for socioemotional and control functions.