White matter abnormalities in adolescents with generalized anxiety disorder: a diffusion tensor imaging study

Area of Science:

• Neuroimaging
• Developmental Neuroscience
• Psychiatry

Background:

• Generalized anxiety disorder (GAD) is linked to abnormal emotion regulation circuitry involving the amygdala and prefrontal cortex.
• White matter integrity in this circuitry is altered in adults with GAD.
• Previous research has not identified white matter abnormalities in adolescents with GAD.

Purpose of the Study:

• To investigate white matter integrity in adolescents diagnosed with GAD using diffusion tensor imaging.
• To compare white matter microstructure between adolescents with GAD and healthy controls.

Main Methods:

• Diffusion tensor imaging (DTI) was performed on 25 adolescents with GAD and 24 healthy controls.
• Voxel-wise Tract-Based Spatial Statistics (TBSS) analysis was used to compare fractional anisotropy (FA) values between groups.

Main Results:

• Adolescents with GAD exhibited significantly reduced fractional anisotropy (FA) compared to healthy controls.
• These FA reductions were observed in bilateral uncinate fasciculus, inferior fronto-occipital fasciculus, inferior longitudinal fasciculus, and corona radiata.

Conclusions:

• The study identifies specific white matter abnormalities in adolescents with GAD.
• These findings suggest a neural basis for emotion dysregulation in adolescent GAD.