Grey matter abnormalities in social anxiety disorder: a pilot study

Area of Science:

• Neuroscience
• Psychiatry
• Neuroimaging

Background:

• Social anxiety disorder (SAD) is prevalent, yet its neuroanatomical underpinnings, specifically grey matter integrity, remain underexplored.
• Existing research primarily focuses on functional neuroanatomy, leaving structural correlates less understood.

Purpose of the Study:

• To investigate cortical thickness and subcortical grey matter volumes in adults with generalized social anxiety disorder (SAD) compared to healthy controls.
• To identify potential structural brain differences associated with SAD.

Main Methods:

• Structural magnetic resonance imaging (MRI) was employed on 13 unmedicated adult patients with SAD and 13 matched healthy controls.
• Cortical thickness and subcortical volumes were quantified using the Freesurfer automated algorithm.
• 3T MRI scans were utilized for high-resolution imaging.

Main Results:

• Patients with SAD demonstrated significant bilateral cortical thinning in the fusiform and post central regions compared to controls.
• Right hemisphere-specific cortical thinning was observed in frontal, temporal, parietal, and insular regions in individuals with SAD.
• While uncorrected grey matter volumes were lower in SAD patients, no significant volumetric differences were found in corrected amygdala, hippocampal, or cortical grey matter volumes.

Conclusions:

• Structural differences in grey matter thickness between SAD patients and controls suggest diffuse neuroanatomical network involvement in social anxiety and behavior.
• Further research is required to elucidate the causal mechanisms underlying these observed structural abnormalities in SAD.