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Published on: November 27, 2019
Localized gray matter volume abnormalities in generalized anxiety disorder
Anne Schienle1, Franz Ebner, Axel Schäfer
1Department of Clinical Psychology, University of Graz, Universitätsplatz 2/III, 8010, Graz, Austria, anne.schienle@uni-graz.at.
European Archives of Psychiatry and Clinical Neuroscience
|September 8, 2010
Summary
Generalized anxiety disorder (GAD) is linked to increased gray matter volume in brain regions like the amygdala and dorsomedial prefrontal cortex (DMPFC). These structural brain differences may predispose individuals to GAD or result from chronic worrying.
Area of Science:
- Neuroscience
- Psychiatry
- Radiology
Background:
- Generalized anxiety disorder (GAD) involves excessive worry, but its underlying neural mechanisms, particularly structural brain abnormalities in adults, remain unclear.
- Previous neuroanatomical findings in GAD have been inconsistent and often based on pediatric populations.
Purpose of the Study:
- To investigate structural brain differences in adult patients with GAD compared to healthy controls.
- To explore the relationship between gray matter volumes in specific brain regions and GAD symptom severity.
Main Methods:
- Structural magnetic resonance imaging (MRI) was performed on 16 adult women with GAD and 15 healthy female controls.
- Voxel-based morphometry (VBM) was used to analyze gray matter volumes in brain regions associated with worry, anxiety, and emotion regulation.
Main Results:
- Patients with GAD exhibited significantly larger gray matter volumes in the amygdala and dorsomedial prefrontal cortex (DMPFC) compared to controls.
- Positive correlations were observed between GAD symptom severity and the volumes of the DMPFC and anterior cingulate cortex.
Conclusions:
- Adults with GAD display localized gray matter volume differences in key brain areas involved in anticipatory anxiety and emotion regulation.
- These neuroanatomical alterations could represent a predisposition to GAD or be a consequence of the disorder's characteristic chronic worrying behavior.
- Future MRI studies are needed to elucidate the causal relationship between these brain abnormalities and GAD.
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