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Brain connectome modularity in weight-restored anorexia nervosa and body dysmorphic disorder

  • A. Zhang (a1), A. Leow (a1) (a2) (a3), L. Zhan (a4), J. GadElkarim (a1), T. Moody (a5), S. Khalsa (a5), M. Strober (a5) and J. D. Feusner (a5)...
Abstract
Background

Anorexia nervosa (AN) and body dysmorphic disorder (BDD) frequently co-occur, and have several overlapping phenomenological features. Little is known about their shared neurobiology. The aim of the study was to compare modular organization of brain structural connectivity.

Method

We acquired diffusion-weighted magnetic resonance imaging data on unmedicated individuals with BDD (n = 29), weight-restored AN (n = 24) and healthy controls (HC) (n = 31). We constructed connectivity matrices using whole-brain white matter tractography, and compared modular structures across groups.

Results

AN showed abnormal modularity involving frontal, basal ganglia and posterior cingulate nodes. There was a trend in BDD for similar abnormalities, but no significant differences compared with AN. In AN, poor insight correlated with longer path length in right caudal anterior cingulate and right posterior cingulate.

Conclusions

Abnormal network organization patterns in AN, partially shared with BDD, may have implications for understanding integration between reward and habit/ritual formation, as well as conflict monitoring/error detection.

Copyright
Corresponding author
*Address for correspondence: A. Leow, M.D., Ph.D., Department of Psychiatry and Bioengineering, University of Illinois College of Medicine, Room 584, 1601 West Taylor Street, Chicago, IL 60612, USA. (Email: alexfeuillet@gmail.com)
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