Physical aggressiveness and gray matter deficits in ventromedial prefrontal cortex

Area of Science:

• Neuroscience
• Psychology
• Behavioral Science

Background:

• Lesions in the ventromedial prefrontal cortex (VMPFC) are historically linked to aggressive behavior.
• The impact of naturally occurring VMPFC deficits on aggression in non-clinical populations remains unclear.

Purpose of the Study:

• To investigate the association between gray matter density in the VMPFC and dispositional aggression in healthy adults.
• To determine if VMPFC gray matter deficits correlate with real-world violent behavior.

Main Methods:

• Voxel-based morphometry was used to analyze brain scans of 138 healthy adult participants.
• Gray matter density was regressed against self-reported physical aggression, verbal aggression, and sex.

Main Results:

• Reduced gray matter volume in the VMPFC and frontopolar cortex was significantly associated with higher levels of physical aggression.
• Lower gray matter density in the VMPFC cluster predicted a greater likelihood of engaging in real-world violence.

Conclusions:

• Granular deficits in VMPFC gray matter within the normal population can contribute to physical aggression.
• These findings highlight the role of the VMPFC in regulating aggressive behavior even in the absence of brain lesions.