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The Inverse Relationship between the Microstructural Variability of Amygdala-Prefrontal Pathways and Trait Anxiety Is
M Justin Kim1, Annemarie C Brown1, Alison M Mattek1
1Department of Psychological and Brain Sciences, Dartmouth College Hanover, NH, USA.
Frontiers in Systems Neuroscience
|December 1, 2016
Summary
Trait anxiety is linked to reduced white matter pathway integrity between the amygdala and ventral prefrontal cortex (vPFC). This brain-anxiety connection, particularly strong in females, may mediate affective disorders.
Area of Science:
- Neuroscience
- Psychiatry
- Medical Imaging
Background:
- Anxiety significantly affects daily life and can contribute to affective disorders.
- Alterations in neural circuitry, specifically amygdala-ventral prefrontal cortex (vPFC) communication, are implicated in trait anxiety.
Purpose of the Study:
- To investigate the neuroanatomical basis of trait anxiety by examining white matter pathways between the amygdala and vPFC.
- To determine if structural integrity of these pathways is associated with anxiety levels.
Main Methods:
- Utilized a 61-direction diffusion-weighted imaging protocol to identify amygdala-vPFC white matter tracts.
- Correlated the structural integrity of these pathways with self-reported trait anxiety levels in two independent datasets.
- Examined the moderating effect of sex on the brain-anxiety relationship.
Main Results:
- Found an inverse correlation between the structural integrity of amygdala-vPFC white matter pathways and trait anxiety levels.
- This relationship was consistently observed across both the initial and validation datasets.
- The association between brain structure and anxiety was significantly stronger in females.
Conclusions:
- Structural integrity of amygdala-vPFC white matter pathways may serve as a neuroanatomical mediator for trait anxiety.
- These findings offer insights into the neural underpinnings of anxiety and psychopathology.
- The sex-specific differences highlight the need for tailored approaches in understanding and treating anxiety disorders.
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