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Cortical thickness correlates with impulsiveness in healthy adults
Christina Schilling1, Simone Kühn, Alexander Romanowski
1Department of Psychiatry and Psychotherapy, Charité University Medicine Campus Mitte, St. Hedwig Krankenhaus, Große Hamburger Str. 5-11, 10115 Berlin, Germany. christina.schilling@charite.de
Neuroimage
|August 11, 2011
Summary
Brain structure differences in cortical thickness are linked to impulsiveness. Specifically, the left middle frontal gyrus (MFG) shows thinner cortex associated with higher impulsivity scores in healthy adults.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Brain Imaging
Background:
- Impulsiveness is a key personality trait linked to substance use and psychiatric disorders.
- Understanding the neural basis of impulsiveness is crucial for clinical applications.
Purpose of the Study:
- To investigate the structural brain correlates of different impulsiveness dimensions in healthy adults.
- To identify overlapping and distinct cerebral features associated with attentional, motor, and nonplanning impulsiveness.
Main Methods:
- Acquired high-resolution MRI scans from 32 healthy adults.
- Modeled cortical thickness (CT) by measuring distances between cortical surfaces.
- Analyzed associations between CT and impulsiveness dimensions using the Barratt-Impulsiveness-Scale (BIS).
Main Results:
- A significant negative correlation was found between left middle frontal gyrus (MFG) CT and attention, motor, nonplanning, and total BIS scores.
- Cortical thickness of the orbitofrontal (OFC) and superior frontal gyrus (SFG) was inversely correlated with total and motor BIS scores.
- One positive correlation was observed between right inferior temporal CT and nonplanning impulsiveness score.
Conclusions:
- The MFG plays a critical role in executive functions, attention, and top-down control.
- The MFG, OFC, and SFG are implicated in mediating behavioral inhibition and planned actions, core aspects of impulsiveness.
- Structural variations in these frontal brain regions are associated with different facets of impulsiveness.
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