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Baur, Volker; Brühl, Annette Beatrix; Herwig, Uwe; Eberle, Tanja; Rufer, Michael; Delsignore, Aba; Jäncke, Lutz; Hänggi, Jürgen (2013). Evidence of frontotemporal structural hypoconnectivity in social anxiety disorder: a quantitative fiber tractography study. Human Brain Mapping, 34(2):437-446.

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Abstract

Investigation of the brain's white matter fiber tracts in social anxiety disorder (SAD) may provide insight into the underlying pathophysiology. Because models of pathological anxiety posit altered frontolimbic interactions, the uncinate fasciculus (UF) connecting (orbito-) frontal and temporal areas including the amygdala is of particular interest. Microstructural alterations in parts of the UF have been reported previously, whereas examination of the UF as discrete fiber tract with regard to more large-scale properties is still lacking. Diffusion tensor imaging was applied in 25 patients with generalized SAD and 25 healthy control subjects matched by age and gender. By means of fiber tractography, the UF was reconstructed for each participant. The inferior fronto-occipital fasciculus (IFOF), originating from the frontal cortex similarly to the UF, was additionally included as control tract. Volume and fractional anisotropy (FA) were compared between the groups for both tracts. Volume of left and right UF was reduced in patients with SAD, reaching statistical significance for the left UF. Bilateral IFOF volume was not different between groups. A similar pattern was observed for FA. Reduced volume of the left UF in SAD fits well into pathophysiological models of anxiety, as it suggests deficient structural connectivity between higher-level control areas in the orbitofrontal cortex and more basal limbic areas like the amygdala. The results point to a specific role of the left UF with regard to altered white matter volume in SAD. However, results should be replicated and functional correlates of altered UF volume be determined in future studies.

Citations

13 citations in Web of Science®
6 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Psychiatric University Hospital Zurich > Clinic for Clinical and Social Psychiatry Zurich West (former)
04 Faculty of Medicine > University Hospital Zurich > Clinic for Psychiatry and Psychotherapy
06 Faculty of Arts > Institute of Psychology
04 Faculty of Medicine > Center for Medical Research
DDC:570 Life sciences; biology
150 Psychology
610 Medicine & health
Language:English
Date:2013
Deposited On:25 Nov 2011 09:56
Last Modified:27 Nov 2013 17:29
Publisher:Wiley-Blackwell
ISSN:1065-9471
Publisher DOI:10.1002/hbm.21447
PubMed ID:22076860

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