Childhood trauma moderates morphometric associations between orbitofrontal cortex and amygdala: implications for...

Area of Science:

• Neuroscience
• Developmental Psychology
• Psychiatry

Background:

• Chronic early-life stress can negatively impact the orbitofrontal cortex (OFC)-amygdala circuit.
• Previous research primarily used functional neuroimaging, leaving morphometric changes understudied.
• The link between childhood trauma and structural alterations in this limbic-cortical network requires investigation.

Purpose of the Study:

• To investigate anatomical differences in the OFC-amygdala circuit in adults with and without childhood trauma exposure.
• To examine the relationship between these environment-by-neurobiological effects and pathological personality traits.

Main Methods:

• 137 ethnically diverse adults underwent clinical interviews, personality trait assessments, and anatomical MRI scans.
• Volumetric associations between the OFC and amygdala were analyzed.
• The moderating role of childhood trauma on these associations and personality traits was assessed.

Main Results:

• Childhood trauma exposure moderated bilateral OFC-amygdala volumetric associations.
• Adults with trauma showed a positive medial OFC-amygdala volume association, contrasting with the negative association in trauma-unexposed adults.
• Trauma exposure altered the association between OFC volume and antagonistic/disinhibited personality traits.

Conclusions:

• The OFC-amygdala circuit may be an anatomical substrate for how early trauma leads to adult emotional dysregulation and personality pathology.
• Results indicate divergent neuroanatomical pathways influenced by early trauma exposure, leading to similar personality phenotypes.
• This study provides novel insights into the neurobiological mechanisms underlying trauma-related personality alterations.